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Optical coherence tomography (OCT) in ophthalmology is focused on in this post. OCT is an imaging technique that uses interferometry with short-coherence-length light to obtain micrometer-level depth resolution and uses transverse scanning of the light beam to form two- and three-dimensional images from light reflected from within biological tissue or other scattering media. Short-coherence-length light can be obtained using a superluminescent diode (SLD) with a broad spectral bandwidth or a broadly tunable laser with narrow linewidth. The first demonstration of 2D OCT imaging (in vitro) was published by a team from MIT and Harvard Medical School in a 1991 article in the journal Science.^[1] The article introduced the term “OCT” to credit its derivation from optical coherence-domain reflectometry, in which the axial resolution is based on temporal coherence.^[2] The 1D OCT (the technology went under numerous names) advances, starting in 1981, are discussed in the introduction. The first demonstration of in vivo 2D OCT imaging of the eye quickly followed.^[3]^[4]^[5] Hee,et.al. is similar from what is expected for OCT^[6].

Tanno et al. obtained a patent on optical heterodyne tomography (similar to TD-OCT) in Japan in 1990, but not outside Japan.^[7] The first US patents on OCT by the MIT/Harvard group described both a time-domain OCT (TD-OCT) system ^[8]^[9] and a Fourier-domain OCT (FD-OCT) system of the swept-source variety.^[8] These patents were licensed by Zeiss and formed the basis of the first generations of OCT engines until 2006. Other OCT patents, in particular the catheter/endoscope would be a dominant patent till approximately 2016.

In the decade preceding the invention of OCT, interferometry with short-coherence-length light had been investigated for a variety of applications.^[10]^[11]^[12]^[13]^[14]^[15]^[16]^[17]^[18]^[19]^[20]^[21] These techniques had varying names, and some can be labeled 1-dimension OCT, but the most critical work is discussed in the introduction (next section). This includes three 1981 papers, one 1986 paper, and three 1987 papers. The potential to use interferometry for imaging was proposed,^[21] and measurement of retinal elevation profile and thickness had been demonstrated.^[20]

The initial commercial clinical OCT systems were based on point-scanning TD-OCT technology, which primarily produced cross-sectional images due to the speed limitation (tens to thousands of axial scans per second). Fourier-domain OCT became available clinically 2006, enabling much greater image acquisition rate (tens of thousands to hundreds of thousands axial scans per second) without sacrificing signal strength. The higher speed allowed for 3-dimensional imaging, which can be visualized in both en face and cross-sectional views. Novel contrasts such as angiography, elastography, and optoretinography also became possible by detecting signal change over time. Over the past 3 decades, the speed of commercial clinical OCT systems has increased more than 1000-fold, doubling every 3 years and rivaling the Moore’s law of computer chip performance. Development of parallel image acquisition approaches such as line-field and full-field technology may allow the performance improvement trend to continue.

OCT is most widely used in ophthalmology, in which it has transformed the diagnosis and monitoring of retinal diseases, optic nerve diseases, and corneal diseases. It has greatly improved the management of the top three causes of blindness – macular degeneration, diabetic retinopathy, and glaucoma – thereby preventing vision loss in many patients. By 2016 OCT was estimated to be used in more than 30 million imaging procedures per year worldwide.^[22]

OCT angioscopy is used in the intravascular evaluation of coronary artery plaques and to guide stent placement. Beyond ophthalmology and cardiology, applications are also developing in other medical specialties such as dermatology, gastroenterology (endoscopy), neurology, oncology, and dentistry.^[23]^[24]

Introduction

Optical coherence tomogram of a fingertip. It is possible to observe the sweat glands, having "corkscrew appearance"

Interferometric reflectometry of biological tissue, especially of the human eye using short-coherence-length light (also referred to as partially-coherent, low-coherence, or broadband, broad-spectrum, or white light) was investigated in parallel by multiple groups worldwide since 1980s. One dimensional OCT was demonstrated by three groups in 1981 but the technology would go under numerous names including low coherence interferometry (LCI)^[25]^[26]^[27]. McDonald appears the first to use swept source reflectometry. These 1-D OCT were primarily used for assessing optical fibers so was 1-D. Using a similar system, a team led by J. Fujimoto and E. Ippen would successfully image biological tissue with 1 D OCT^[28]. Three groups in 1987 would perform 1 dimensional OCT using a diode source and a Michelson interferometer including Danielson et.al., Takeda et.al., and Youngquistet.al. ^[29]^[30]. In 1991, David Huang, then a student in Prof. James Fujimoto laboratory at Massachusetts Institute of Technology, working with Eric Swanson at the MIT Lincoln Laboratory and colleagues at the Harvard Medical School, successfully demonstrated imaging and called the new imaging modality "optical coherence tomography".^[31] Since then, OCT with micrometer resolution and cross-sectional imaging capabilities has become a prominent biomedical imaging technique that has continually improved in technical performance and range of applications. For ophthalmology, the improvement in image acquisition rate is particularly spectacular, starting with the original 0.8 Hz axial scan repetition rate ^[1] to the current commercial clinical OCT systems operating at several hundred kHz and laboratory prototypes at multiple MHz. In 1993, after OCT had been unsuccessful in imaging non-transparent tissue, Mark Brezinski MD, PhD of Massachusetts General Hospital/Harvard Medical School proposed imaging at 1300 nm rather than 830 nm of the eye (after analyzing a 1989 scattering/absorption study by Parsa et.al in liver).^[32] A collaboration was established between Dr. Brezinski and Professor James Fujimoto and they successfully imaged artery as well as other scattering tissue (including neoplasia) and published in1996^[33] The most important technical advance for cardiology and other nontransparent tissue was likely the catheter/endoscope which required rapid alignment of two optical fibers with 8 µm cores (one rotating) across free space. For their roles in the pioneering OCT in Ophthalmology; Fujimoto, Huang, and Swanson received, the 2023 Lasker-DeBakey Clinical Medical Research Award and the National Medal of Technology and Innovation. ^[34] These developments have been reviewed in articles written for the general ^[22] scientific ^[35] and medical ^[36] readership.

It is particularly suited to ophthalmic applications and other tissue imaging requiring micrometer resolution and millimeter penetration depth.^[37] OCT has also been used for various art conservation projects, where it is used to analyze different layers in a painting. OCT has interesting advantages over other medical imaging systems. Medical ultrasonography, magnetic resonance imaging (MRI), confocal microscopy, and OCT are differently suited to morphological tissue imaging: while the first two have whole body but low resolution imaging capability (typically a fraction of a millimeter), the third one can provide images with resolutions well below 1 micrometer (i.e. sub-cellular), between 0 and 100 micrometers in depth, and the fourth can probe as deep as 500 micrometers, but with a lower (i.e. architectural) resolution (around 10 micrometers in lateral and a few micrometers in depth in ophthalmology, for instance, and 20 micrometers in lateral in endoscopy).^[38]^[39]

OCT is based on low-coherence interferometry.^[40]^[41]^[42] In conventional interferometry with long coherence length (i.e., laser interferometry), interference of light occurs over a distance of meters. In OCT, this interference is shortened to a distance of micrometers, owing to the use of broad-bandwidth light sources (i.e., sources that emit light over a broad range of frequencies). Light with broad bandwidths can be generated by using superluminescent diodes or lasers with extremely short pulses (femtosecond lasers). White light is an example of a broadband source with lower power.

Light in an OCT system is broken into two arms – a sample arm (containing the item of interest) and a reference arm (usually a mirror). The combination of reflected light from the sample arm and reference light from the reference arm gives rise to an interference pattern, but only if light from both arms have traveled the "same" optical distance ("same" meaning a difference of less than a coherence length). By scanning the mirror in the reference arm, a reflectivity profile of the sample can be obtained (this is time domain OCT). Areas of the sample that reflect back a lot of light will create greater interference than areas that don't. Any light that is outside the short coherence length will not interfere.^[43] This reflectivity profile, called an A-scan, contains information about the spatial dimensions and location of structures within the item of interest. A cross-sectional tomogram (B-scan) may be achieved by laterally combining a series of these axial depth scans (A-scan). A face imaging at an acquired depth is possible depending on the imaging engine used.

Layperson's explanation

Time-domain OCT of the macular area of a retina at 800 nm, axial resolution 3 µm

Optical coherence tomography (OCT) is a technique for obtaining sub-surface images of translucent or opaque materials at a resolution equivalent to a low-power microscope. It is effectively ‘optical ultrasound’, imaging reflections from within tissue to provide cross-sectional images.^[44]

OCT has attracted interest among the medical community because it provides tissue morphology imagery at much higher resolution (less than 10 μm axially and less than 20 μm laterally^[45] ) than other imaging modalities such as MRI or ultrasound.

The key benefits of OCT are:

Live sub-surface images at near-microscopic resolution
Instant, direct imaging of tissue morphology
No preparation of the sample or subject, no contact
No ionizing radiation

OCT delivers high resolution because it is based on light, rather than sound or radio frequency. An optical beam is directed at the tissue, and a small portion of this light that reflects from sub-surface features is collected. Note that most light is not reflected but, rather, scatters off at large angles. In conventional imaging, this diffusely scattered light contributes background that obscures an image. However, in OCT, a technique called interferometry is used to record the optical path length of received photons allowing rejection of most photons that scatter multiple times before detection. Thus OCT can build up clear 3D images of thick samples by rejecting background signal while collecting light directly reflected from surfaces of interest.

Within the range of noninvasive three-dimensional imaging techniques that have been introduced to the medical research community, OCT as an echo technique is similar to ultrasound imaging. Other medical imaging techniques such as computerized axial tomography, magnetic resonance imaging, or positron emission tomography do not use the echo-location principle.^[46]

The technique is limited to imaging 1 to 2 mm below the surface in biological tissue, because at greater depths the proportion of light that escapes without scattering is too small to be detected. No special preparation of a biological specimen is required, and images can be obtained ‘non-contact’ or through a transparent window or membrane. It is also important to note that the laser output from the instruments used is low – eye-safe near-infrared or visible-light^[47] – and no damage to the sample is therefore likely.

Theory

The principle of OCT is white light, or low coherence, interferometry. The optical setup typically consists of an interferometer (Fig. 1, typically Michelson type) with a low coherence, broad bandwidth light source. Light is split into and recombined from reference and sample arms, respectively.

Fig. 1 Full-field OCT optical setup. Components include: super-luminescent diode (SLD), convex lens (L1), 50/50 beamsplitter (BS), camera objective (CO), CMOS-DSP camera (CAM), reference (REF), and sample (SMP). The camera functions as a two-dimensional detector array, and with the OCT technique facilitating scanning in depth, a non-invasive three-dimensional imaging device is achieved.	Fig. 2 Typical optical setup of single point OCT. Scanning the light beam on the sample enables non-invasive cross-sectional imaging up to 3 mm in depth with micrometer resolution.
Fig. 3 Spectral discrimination by swept-source OCT. Components include: swept source or tunable laser (SS), beamsplitter (BS), reference mirror (REF), sample (SMP), photodetector (PD), and digital signal processing (DSP)	Fig. 4 Spectral discrimination by Fourier-domain OCT. Components include: low coherence source (LCS), beamsplitter (BS), reference mirror (REF), sample (SMP), diffraction grating (DG) and full-field detector (CAM) acting as a spectrometer, and digital signal processing (DSP)

Time domain

F_{O}DT\left(\nu \right)=2S_{0}\left(\nu \right)K_{r}\left(\nu \right)K_{s}\left(\nu \right)\qquad \quad (3)

In time domain OCT the path length of the reference arm is varied in time (the reference mirror is translated longitudinally). A property of low coherence interferometry is that interference, i.e. the series of dark and bright fringes, is only achieved when the path difference lies within the coherence length of the light source. This interference is called autocorrelation in a symmetric interferometer (both arms have the same reflectivity), or cross-correlation in the common case. The envelope of this modulation changes as path length difference is varied, where the peak of the envelope corresponds to path length matching.

The interference of two partially coherent light beams can be expressed in terms of the source intensity, $I_{S}$ , as

I=k_{1}I_{S}+k_{2}I_{S}+2{\sqrt {\left(k_{1}I_{S}\right)\cdot \left(k_{2}I_{S}\right)}}\cdot Re\left[\gamma \left(\tau \right)\right]\qquad (1)

where $k_{1}+k_{2}<1$ represents the interferometer beam splitting ratio, and $\gamma (\tau )$ is called the complex degree of coherence, i.e. the interference envelope and carrier dependent on reference arm scan or time delay $\tau$ , and whose recovery is of interest in OCT. Due to the coherence gating effect of OCT the complex degree of coherence is represented as a Gaussian function expressed as^[42]

\gamma \left(\tau \right)=\exp \left[-\left({\frac {\pi \Delta \nu \tau }{2{\sqrt {\ln 2}}}}\right)^{2}\right]\cdot \exp \left(-j2\pi \nu _{0}\tau \right)\qquad \quad (2)

where $\Delta \nu$ represents the spectral width of the source in the optical frequency domain, and $\nu _{0}$ is the centre optical frequency of the source. In equation (2), the Gaussian envelope is amplitude modulated by an optical carrier. The peak of this envelope represents the location of the microstructure of the sample under test, with an amplitude dependent on the reflectivity of the surface. The optical carrier is due to the Doppler effect resulting from scanning one arm of the interferometer, and the frequency of this modulation is controlled by the speed of scanning. Therefore, translating one arm of the interferometer has two functions; depth scanning and a Doppler-shifted optical carrier are accomplished by pathlength variation. In OCT, the Doppler-shifted optical carrier has a frequency expressed as

f_{Dopp}={\frac {2\cdot \nu _{0}\cdot v_{s}}{c}}\qquad \qquad \qquad \qquad \qquad \qquad \qquad \quad (3)

where $\nu _{0}$ is the central optical frequency of the source, $v_{s}$ is the scanning velocity of the pathlength variation, and $c$ is the speed of light.

The axial and lateral resolutions of OCT are decoupled from one another; the former being an equivalent to the coherence length of the light source and the latter being a function of the optics. The axial resolution of OCT is defined as

$\,{l_{c}}$	$={\frac {2\ln 2}{\pi }}\cdot {\frac {\lambda _{0}^{2}}{\Delta \lambda }}$
	$\approx 0.44\cdot {\frac {\lambda _{0}^{2}}{\Delta \lambda }}\qquad \qquad \qquad \qquad \qquad \qquad \qquad \qquad (4)$

where $\lambda _{0}$ and $\Delta \lambda$ are respectively the central wavelength and the spectral width of the light source.^[48]

Fourier domain

Fourier-domain (or Frequency-domain) OCT (FD-OCT) has speed and signal-to-noise ratio (SNR) advantages over time-domain OCT (TD-OCT) and has become the standard in the industry since 2006. The idea of using frequency modulation and coherent detection to obtain ranging information was already demonstrated in optical frequency domain reflectometry^[10] and laser radar^[15] in the 1980s, though the distance resolution and range were much longer than OCT. There are two types of FD-OCT - swept-source OCT (SS-OCT) and spectral-domain OCT (SD-OCT) – both of which acquire spectral interferograms which are then Fourier transformed to obtain an axial scan of reflectance amplitude versus depth. In SS-OCT, the spectral interferogram is acquired sequentially by tuning the wavelength of a laser light source. SD-OCT acquires spectral interferogram simultaneously in a spectrometer. A 1D frequency swept reflectometer was introduced in 1987, but this may not make the definition of OCT.^[49] An implementation of SS-OCT was described by the MIT group as early as 1994.^[8]^[50] A group based in the University of Vienna described measurement of intraocular distance using both tunable laser and spectrometer-based interferometry as early as 1995.^[51]^[52] SD-OCT imaging was first demonstrated both in vitro and in vivo by a collaboration between the Vienna group and a group based in the Nicholas Copernicus University in a series of articles between 2000 and 2002.^[53]^[54]^[55] The SNR advantage of FD-OCT over TD-OCT was analyzed by multiple groups of researchers in 2003.^[56]^[57]^[58]

Spectral-domain OCT

Spectral-domain OCT (spatially encoded frequency domain OCT) extracts spectral information by distributing different optical frequencies onto a detector stripe (line-array CCD or CMOS) via a dispersive element (see Fig. 4). Thereby the information of the full depth scan can be acquired within a single exposure. However, the large signal-to-noise advantage of FD-OCT is reduced due to the lower dynamic range of stripe detectors with respect to single photosensitive diodes, resulting in an SNR advantage of ~10 dB at much higher speeds. This is not much of a problem when working at 1300 nm, however, since dynamic range is not a serious problem at this wavelength range.^[48]

The drawbacks of this technology are found in a strong fall-off of the SNR, which is proportional to the distance from the zero delay and a sinc-type reduction of the depth-dependent sensitivity because of limited detection linewidth. (One pixel detects a quasi-rectangular portion of an optical frequency range instead of a single frequency, the Fourier transform leads to the sinc(z) behavior). Additionally, the dispersive elements in the spectroscopic detector usually do not distribute the light equally spaced in frequency on the detector, but mostly have an inverse dependence. Therefore, the signal has to be resampled before processing, which cannot take care of the difference in local (pixelwise) bandwidth, which results in further reduction of the signal quality. However, the fall-off is not a serious problem with the development of new generation CCD or photodiode array with a larger number of pixels.

Synthetic array heterodyne detection offers another approach to this problem without the need for high dispersion.

Swept-source OCT

Swept-source OCT (Time-encoded frequency domain OCT) tries to combine some of the advantages of standard TD and spectral domain OCT. Here the spectral components are not encoded by spatial separation, but they are encoded in time. The spectrum is either filtered or generated in single successive frequency steps and reconstructed before Fourier transformation. By accommodation of a frequency scanning light source (i.e. frequency scanning laser) the optical setup (see Fig. 3) becomes simpler than spectral domain OCT, but the problem of scanning is essentially translated from the TD-OCT reference arm into the swept source OCT light source. Here the advantage lies in the proven high SNR detection technology, while swept laser sources achieve very small instantaneous bandwidths (linewidths) at very high frequencies (20–200 kHz). Drawbacks are the nonlinearities in the wavelength (especially at high scanning frequencies), the broadening of the linewidth at high frequencies and a high sensitivity to movements of the scanning geometry or the sample (below the range of nanometers within successive frequency steps).

Scanning schemes

Focusing the light beam to a point on the surface of the sample under test, and recombining the reflected light with the reference will yield an interferogram with sample information corresponding to a single A-scan (Z axis only). Scanning of the sample can be accomplished by either scanning the light on the sample, or by moving the sample under test. A linear scan will yield a two-dimensional data set corresponding to a cross-sectional image (X-Z axes scan), whereas an area scan achieves a three-dimensional data set corresponding to a volumetric image (X-Y-Z axes scan).

Single point

Systems based on single point, confocal, or flying-spot time domain OCT, must scan the sample in two lateral dimensions and reconstruct a three-dimensional image using depth information obtained by coherence-gating through an axially scanning reference arm (Fig. 2). Two-dimensional lateral scanning has been electromechanically implemented by moving the sample^[59] using a translation stage, and using a novel micro-electro-mechanical system scanner.^[60]

Line-field OCT

Line-field confocal optical coherence tomography (LC-OCT) is an imaging technique based on the principle of time-domain OCT with line illumination using a broadband laser and line detection using a line-scan camera.^[61] LC-OCT produces B-scans in real-time from multiple A-scans acquired in parallel. En face as well as three-dimensional images can also be obtained by scanning the illumination line laterally.^[62]^[63] The focus is continuously adjusted during the scan of the sample depth, using a high numerical aperture (NA) microscope objective to image with high lateral resolution. By using a supercontinuum laser as a light source, a quasi-isotropic spatial resolution of ~ 1 µm is achieved at a central wavelength of ~ 800 nm. On the other hand, line illumination and detection, combined with the use of a high NA microscope objective, produce a confocal gate that prevents most scattered light that does not contribute to the signal from being detected by the camera. This confocal gate, which is absent in the full-field OCT technique, gives LC-OCT an advantage in terms of detection sensitivity and penetration in highly scattering media such as skin tissues.^[64] So far this technique has been used mainly for skin imaging in the fields of dermatology^[65]^[66]^[67]^[68]^[69]^[70] and cosmetology.^[71]

Full-field OCT

An imaging approach to temporal OCT was developed by Claude Boccara's team in 1998,^[72] with an acquisition of the images without beam scanning. In this technique called full-field OCT (FF-OCT), unlike other OCT techniques that acquire cross-sections of the sample, the images are here "en-face" i.e. like images of classical microscopy: orthogonal to the light beam of illumination.^[73]

More precisely, interferometric images are created by a Michelson interferometer where the path length difference is varied by a fast electric component (usually a piezo mirror in the reference arm). These images acquired by a CCD camera are combined in post-treatment (or online) by the phase shift interferometry method, where usually 2 or 4 images per modulation period are acquired, depending on the algorithm used.^[74]^[75] More recently, approaches that allow rapid single-shot imaging were developed to simultaneously capture multiple phase-shifted images required for reconstruction, using single camera.^[76] Single-shot time-domain OCM is limited only by the camera frame rate and available illumination.

The "en-face" tomographic images are thus produced by a wide-field illumination, ensured by the Linnik configuration of the Michelson interferometer where a microscope objective is used in both arms. Furthermore, while the temporal coherence of the source must remain low as in classical OCT (i.e. a broad spectrum), the spatial coherence must also be low to avoid parasitical interferences (i.e. a source with a large size).^[77]

Selected applications

Optical coherence tomography is an established medical imaging technique and is used across several medical specialties including ophthalmology and cardiology, and is widely used in basic science research applications.

Ophthalmology

Ocular (or ophthalmic) OCT is used heavily by ophthalmologists and optometrists to obtain high-resolution images of the retina and anterior segment. Owing to OCT's capability to show cross-sections of tissue layers with micrometer resolution, OCT provides a straightforward method of assessing cellular organization, photoreceptor integrity,^[78]^[79]^[80]^[81] and axonal thickness in glaucoma,^[82] macular degeneration,^[83] diabetic macular edema,^[84] multiple sclerosis,^[85] optic neuritis,^[86] and other eye diseases or systemic pathologies which have ocular signs.^[87] Additionally, ophthalmologists leverage OCT to assess the vascular health of the retina via a technique called OCT angiography (OCTA).^[88] In ophthalmological surgery, especially retinal surgery, an OCT can be mounted on the microscope. Such a system is called an intraoperative OCT (iOCT) and provides support during the surgery with clinical benefits.^[89]^[90]^[91] Polarization-sensitive OCT was recently applied in the human retina to determine optical polarization properties of vessel walls near the optic nerve.^[92]

Cardiology and intravascular applications

In the setting of cardiology, OCT is used to image coronary arteries in order to visualize vessel wall lumen morphology and microstructure at a resolution 10 times higher than other existing modalities such as intravascular ultrasounds, and x-ray angiography (intracoronary optical coherence tomography). For this type of application, approximately 1 mm in diameter fiber-optics catheters are used to access artery lumen through semi-invasive interventions such as percutaneous coronary interventions.

In 1993, after OCT had been unsuccessful in imaging non-transparent tissue, Mark Brezinski MD, PhD proposed imaging at 1300 nm rather than 830 nm used in the eye. A collaboration was established between Dr. Brezinski and Professor James Fujimoto and they successfully imaged artery as well as other scattering tissue in 1996 ^[93]Students Micheal Hee and Postdoctoral fellow Joseph Izatt generated the first images with Dr. Brezinski (initially chicken and fish). The first demonstration of endoscopic OCT was reported in 1997, by researchers in James Fujimoto laboratory at Massachusetts Institute of Technology and the Mark Brezinski Laboratory at Massachusetts General Hospital. Other team members include pathologist James Southern MD, PhD, student Guillermo James Tearney, student Micheal Hee, post-doctoral fellow Joe Izatt, and post-doctoral fellow Brett Bouma.^[94] The first TD-OCT imaging catheter and system was commercialized by LightLab Imaging, Inc., a company based in Massachusetts formed in 1997 by Fujimoto, Swanson, and Brezinski. The first FD-OCT imaging study was reported by the laboratory of Prof. Guillermo J. Tearney and Prof. Brett Bouma based at Massachusetts General Hospital in 2008.^[95] (Please explain. Thorlabs was selling SS-OCT systems since at least 2007 and generating images) Intravascular FD-OCT was first introduced in the market in 2009 by LightLab Imaging, Inc.^[96] and Terumo Corporation launched a second solution for coronary artery imaging in 2012. The higher imaging speed of FD-OCT enabled the widespread adoption of this imaging technology for coronary artery imaging. It is estimated that over 100,000 FD-OCT coronary imaging cases are performed yearly, and that the market is increasing by approximately 20% every year.^[97]. After two decades from the first in vivo studies, double blind prospective studies are being performed and showing morbidity/mortality benefits "Among patients with complex coronary-artery bifurcation lesions, OCT-guided PCI was associated with a lower incidence of MACE at 2 years than angiography-guided PCI."^[98]

Intravascular OCT has been investigated for use in neurovascular applications, too, including imaging for guiding endovascular treatment of ischemic stroke and brain aneurysms.^[99] Clinical use has been limited to proximal intracranial anatomy of patient with limited tortuosity, showing the potential of OCT for the imaging of neurovascular disease.^[100] An intravascular OCT imaging catheter design tailored for use in tortuous neurovascular anatomy has been proposed in 2020.^[101]

Further developments of intravascular OCT included the combination with other optical imaging modalities (multi-modality imaging). OCT has been combined with fluorescence molecular imaging to enhance its capability to detect molecular/functional and tissue morphological information simultaneously.^[102] In a similar way, combination with near-infrared spectroscopy has been also demonstrated.

Oncology

Endoscopic OCT has been applied to the detection and diagnosis of cancer and precancerous lesions, such as Barrett's esophagus and esophageal dysplasia.^[103]

Dermatology

The first use of OCT in dermatology dates back to 1997.^[104] Since then, OCT has been applied to the diagnosis of various skin lesions including carcinomas.^[105]^[106]^[107] However, the diagnosis of melanoma using conventional OCT is difficult, especially due to insufficient imaging resolution.^[108] Emerging high-resolution OCT techniques such as LC-OCT have the potential to improve the clinical diagnostic process, allowing for the early detection of malignant skin tumors – including melanoma – and a reduction in the number of surgical excisions of benign lesions.^[109] Other promising areas of application include the imaging of lesions where excisions are hazardous or impossible and the guidance of surgical interventions through identification of tumor margins.

Dentistry

Researchers in Tokyo medical and Dental University were able to detect enamel white spot lesions around and beneath the orthodontic brackets using swept source OCT.^[110]

Research applications

Researchers have used OCT to produce detailed images of mice brains, through a "window" made of zirconia that has been modified to be transparent and implanted in the skull.^[111]^[112] Optical coherence tomography is also applicable and increasingly used in industrial applications, such as nondestructive testing (NDT), material thickness measurements,^[113] and in particular thin silicon wafers^[114]^[115] and compound semiconductor wafers thickness measurements^[116]^[117] surface roughness characterization, surface and cross-section imaging^[118]^[119] and volume loss measurements. OCT systems with feedback can be used to control manufacturing processes. With high speed data acquisition,^[120] and sub-micron resolution, OCT is adaptable to perform both inline and off-line.^[121] Due to the high volume of produced pills, an interesting field of application is in the pharmaceutical industry to control the coating of tablets.^[122] Fiber-based OCT systems are particularly adaptable to industrial environments.^[123] These can access and scan interiors of hard-to-reach spaces,^[124] and are able to operate in hostile environments—whether radioactive, cryogenic, or very hot.^[125] Novel optical biomedical diagnostic and imaging technologies are currently being developed to solve problems in biology and medicine.^[126] As of 2014, attempts have been made to use optical coherence tomography to identify root canals in teeth, specifically canal in the maxillary molar, however, there is no difference with the current methods of dental operatory microscope.^[127]^[128]^{[non-primary source needed]} Research conducted in 2015 was successful in utilizing a smartphone as an OCT platform, although much work remains to be done before such a platform would be commercially viable.^[129] Photonic integrated circuits may be a promising option to miniaturized OCT. Similarly to integrated circuits silicon-based fabrication techniques can be used to produced miniaturized photonic systems. First in vivo human retinal imaging has been reported recently ^[130]

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-{{Short description|Imaging technique}}
+{{Short description|Optical Coherence Tomography in Ophthalmology.}}
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 }}
 [[File:Optical coherence tomography of human retina.gif|thumb|328x328px|A high-resolution spectral-domain OCT scan (3x3-mm) of a dry age-related macular degeneration eye showing geographic atrophy and drusen in macula on both cross-sectional and en face fly-through.]]
-'''Optical coherence tomography''' ('''OCT''') is an imaging technique that uses [[interferometry]] with short-[[Coherence length|coherence-length]] light to obtain micrometer-level depth resolution and uses transverse scanning of the light beam to form two- and three-dimensional images from light reflected from within biological tissue or other [[scattering]] media. Short-coherence-length light can be obtained using a [[superluminescent diode]] (SLD) with a broad [[spectral bandwidth]] or a broadly tunable laser with narrow [[linewidth]]. The first demonstration of OCT imaging (in vitro) was published by a team from MIT and Harvard Medical School in a 1991 article in the journal Science.<ref name=":6">{{Cite journal |last1=Huang |first1=David |last2=Swanson |first2=Eric A. |last3=Lin |first3=Charles P. |last4=Schuman |first4=Joel S. |last5=Stinson |first5=William G. |last6=Chang |first6=Warren |last7=Hee |first7=Michael R. |last8=Flotte |first8=Thomas |last9=Gregory |first9=Kenton |last10=Puliafito |first10=Carmen A. |last11=Fujimoto |first11=James G. |date=1991-11-22 |title=Optical Coherence Tomography |journal=Science |language=en |volume=254 |issue=5035 |pages=1178–1181 |doi=10.1126/science.1957169 |issn=0036-8075 |pmc=4638169 |pmid=1957169}}</ref> The article introduced the term “OCT” to credit its derivation from optical coherence-domain [[reflectometry]], in which the axial resolution is based on [[temporal coherence]].<ref>{{Cite journal |last1=Youngquist |first1=Robert C. |last2=Carr |first2=Sally |last3=Davies |first3=D. E. N. |date=1987-03-01 |title=Optical coherence-domain reflectometry: a new optical evaluation technique |url=http://dx.doi.org/10.1364/ol.12.000158 |journal=Optics Letters |volume=12 |issue=3 |pages=158 |doi=10.1364/ol.12.000158 |issn=0146-9592}}</ref> The first demonstrations of in vivo OCT imaging quickly followed.<ref>{{Cite journal |last1=Izatt |first1=Joseph A. |last2=Hee |first2=Michael R. |last3=Huang |first3=David |last4=Fujimoto |first4=James G. |last5=Swanson |first5=Eric A. |last6=Lin |first6=Charles P. |last7=Shuman |first7=Joel S. |last8=M.d |first8=Carmen A. Puliafito |editor-first1=Jean-Marie A. |editor-first2=Qiushi |editor-last1=Parel |editor-last2=Ren |date=1993-06-24 |title=Ophthalmic diagnostics using optical coherence tomography |url=https://www.spiedigitallibrary.org/conference-proceedings-of-spie/1877/0000/Ophthalmic-diagnostics-using-optical-coherence-tomography/10.1117/12.147520.full |journal=Ophthalmic Technologies III |publisher=SPIE |volume=1877 |pages=136–144 |doi=10.1117/12.147520}}</ref><ref>{{Cite journal |last1=Swanson |first1=E. A. |last2=Izatt |first2=J. A. |last3=Hee |first3=M. R. |last4=Huang |first4=D. |last5=Lin |first5=C. P. |last6=Schuman |first6=J. S. |last7=Puliafito |first7=C. A. |last8=Fujimoto |first8=J. G. |date=1993-11-01 |title=In vivo retinal imaging by optical coherence tomography |url=https://pubmed.ncbi.nlm.nih.gov/19829430 |journal=Optics Letters |volume=18 |issue=21 |pages=1864–1866 |doi=10.1364/ol.18.001864 |issn=0146-9592 |pmid=19829430}}</ref><ref>{{Cite journal |last1=Fercher |first1=A. F. |last2=Hitzenberger |first2=C. K. |last3=Drexler |first3=W. |last4=Kamp |first4=G. |last5=Sattmann |first5=H. |date=1993-07-15 |title=In vivo optical coherence tomography |url=https://pubmed.ncbi.nlm.nih.gov/8328536 |journal=American Journal of Ophthalmology |volume=116 |issue=1 |pages=113–114 |doi=10.1016/s0002-9394(14)71762-3 |issn=0002-9394 |pmid=8328536}}</ref>
+'''Optical coherence tomography''' ('''OCT''') '''in ophthalmology''' is focused on in this post.  OCT is an imaging technique that uses [[interferometry]] with short-[[Coherence length|coherence-length]] light to obtain micrometer-level depth resolution and uses transverse scanning of the light beam to form two- and three-dimensional images from light reflected from within biological tissue or other [[scattering]] media. Short-coherence-length light can be obtained using a [[superluminescent diode]] (SLD) with a broad [[spectral bandwidth]] or a broadly tunable laser with narrow [[linewidth]]. The first demonstration of 2D OCT imaging (in vitro) was published by a team from MIT and Harvard Medical School in a 1991 article in the journal Science.<ref name=":6">{{Cite journal |last1=Huang |first1=David |last2=Swanson |first2=Eric A. |last3=Lin |first3=Charles P. |last4=Schuman |first4=Joel S. |last5=Stinson |first5=William G. |last6=Chang |first6=Warren |last7=Hee |first7=Michael R. |last8=Flotte |first8=Thomas |last9=Gregory |first9=Kenton |last10=Puliafito |first10=Carmen A. |last11=Fujimoto |first11=James G. |date=1991-11-22 |title=Optical Coherence Tomography |journal=Science |language=en |volume=254 |issue=5035 |pages=1178–1181 |doi=10.1126/science.1957169 |issn=0036-8075 |pmc=4638169 |pmid=1957169}}</ref> The article introduced the term “OCT” to credit its derivation from optical coherence-domain [[reflectometry]], in which the axial resolution is based on [[temporal coherence]].<ref>{{Cite journal |last1=Youngquist |first1=Robert C. |last2=Carr |first2=Sally |last3=Davies |first3=D. E. N. |date=1987-03-01 |title=Optical coherence-domain reflectometry: a new optical evaluation technique |url=http://dx.doi.org/10.1364/ol.12.000158 |journal=Optics Letters |volume=12 |issue=3 |pages=158 |doi=10.1364/ol.12.000158 |issn=0146-9592}}</ref> The 1D OCT (the technology went under numerous names) advances, starting in 1981, are discussed in the introduction. The first demonstration of in vivo 2D OCT imaging of the eye quickly followed.<ref>{{Cite journal |last1=Izatt |first1=Joseph A. |last2=Hee |first2=Michael R. |last3=Huang |first3=David |last4=Fujimoto |first4=James G. |last5=Swanson |first5=Eric A. |last6=Lin |first6=Charles P. |last7=Shuman |first7=Joel S. |last8=M.d |first8=Carmen A. Puliafito |editor-first1=Jean-Marie A. |editor-first2=Qiushi |editor-last1=Parel |editor-last2=Ren |date=1993-06-24 |title=Ophthalmic diagnostics using optical coherence tomography |url=https://www.spiedigitallibrary.org/conference-proceedings-of-spie/1877/0000/Ophthalmic-diagnostics-using-optical-coherence-tomography/10.1117/12.147520.full |journal=Ophthalmic Technologies III |publisher=SPIE |volume=1877 |pages=136–144 |doi=10.1117/12.147520}}</ref><ref>{{Cite journal |last1=Swanson |first1=E. A. |last2=Izatt |first2=J. A. |last3=Hee |first3=M. R. |last4=Huang |first4=D. |last5=Lin |first5=C. P. |last6=Schuman |first6=J. S. |last7=Puliafito |first7=C. A. |last8=Fujimoto |first8=J. G. |date=1993-11-01 |title=In vivo retinal imaging by optical coherence tomography |url=https://pubmed.ncbi.nlm.nih.gov/19829430 |journal=Optics Letters |volume=18 |issue=21 |pages=1864–1866 |doi=10.1364/ol.18.001864 |issn=0146-9592 |pmid=19829430}}</ref><ref>{{Cite journal |last1=Fercher |first1=A. F. |last2=Hitzenberger |first2=C. K. |last3=Drexler |first3=W. |last4=Kamp |first4=G. |last5=Sattmann |first5=H. |date=1993-07-15 |title=In vivo optical coherence tomography |url=https://pubmed.ncbi.nlm.nih.gov/8328536 |journal=American Journal of Ophthalmology |volume=116 |issue=1 |pages=113–114 |doi=10.1016/s0002-9394(14)71762-3 |issn=0002-9394 |pmid=8328536}}</ref>  Hee,et.al. is similar from what is expected for OCT<ref>{{Cite journal |last=Hee |first=Michael R. |last2=Izatt |first2=Joseph A. |last3=Swanson |first3=Eric A. |last4=Huang |first4=David |last5=Schuman |first5=Joel S. |last6=Lin |first6=Charles P. |last7=Puliafito |first7=Carmen A. |last8=Fujimoto |first8=James G. |date=1995-03-01 |title=Optical Coherence Tomography of the Human Retina |url=https://doi.org/10.1001/archopht.1995.01100030081025 |journal=Archives of Ophthalmology |volume=113 |issue=3 |pages=325–332 |doi=10.1001/archopht.1995.01100030081025 |issn=0003-9950}}</ref>.
-The first US patents on OCT by the MIT/Harvard group described both a time-domain OCT (TD-OCT) system <ref name=":0">{{Cite patent|number=US5321501A|title=Method and apparatus for optical imaging with means for controlling the longitudinal range of the sample|gdate=1994-06-14|invent1=Swanson|invent2=Huang|invent3=Fujimoto|invent4=Puliafito|inventor1-first=Eric A.|inventor2-first=David|inventor3-first=James G.|inventor4-first=Carmen A.|url=https://patents.google.com/patent/US5321501A/en}}</ref><ref>{{Cite patent|number=US5459570A|title=Method and apparatus for performing optical measurements|gdate=1995-10-17|invent1=Swanson|invent2=Huang|invent3=Fujimoto|invent4=Puliafito|inventor1-first=Eric A.|inventor2-first=David|inventor3-first=James G.|inventor4-first=Carmen A.|url=https://patents.google.com/patent/US5459570/en}}</ref> and a Fourier-domain OCT (FD-OCT) system of the swept-source variety.<ref name=":0" /> These patents were licensed by Zeiss and formed the basis of the first generations of OCT products until 2006. Tanno et al. obtained a patent on optical heterodyne tomography (similar to TD-OCT) in Japan in the same year.<ref>Naohiro Tanno, Tsutomu Ichikawa, Akio Saeki: "Lightwave Reflection Measurement," Japanese Patent # 2010042 (1990) (Japanese Language)</ref>
+Tanno et al. obtained a patent on optical heterodyne tomography (similar to TD-OCT) in Japan in 1990, but not outside Japan.<ref>Naohiro Tanno, Tsutomu Ichikawa, Akio Saeki: "Lightwave Reflection Measurement," Japanese Patent # 2010042 (1990) (Japanese Language)</ref> The first US patents on OCT by the MIT/Harvard group described both a time-domain OCT (TD-OCT) system <ref name=":0">{{Cite patent|number=US5321501A|title=Method and apparatus for optical imaging with means for controlling the longitudinal range of the sample|gdate=1994-06-14|invent1=Swanson|invent2=Huang|invent3=Fujimoto|invent4=Puliafito|inventor1-first=Eric A.|inventor2-first=David|inventor3-first=James G.|inventor4-first=Carmen A.|url=https://patents.google.com/patent/US5321501A/en}}</ref><ref>{{Cite patent|number=US5459570A|title=Method and apparatus for performing optical measurements|gdate=1995-10-17|invent1=Swanson|invent2=Huang|invent3=Fujimoto|invent4=Puliafito|inventor1-first=Eric A.|inventor2-first=David|inventor3-first=James G.|inventor4-first=Carmen A.|url=https://patents.google.com/patent/US5459570/en}}</ref> and a Fourier-domain OCT (FD-OCT) system of the swept-source variety.<ref name=":0" /> These patents were licensed by Zeiss and formed the basis of the first generations of OCT engines until 2006.  Other OCT patents, in particular the catheter/endoscope would be a dominant patent till approximately 2016.
-In the decade preceding the invention of OCT, interferometry with short-coherence-length light had been investigated for a variety of applications.<ref name=":4">{{Cite journal |last1=Eickhoff |first1=W. |last2=Ulrich |first2=R. |date=1981-11-01 |title=Optical frequency domain reflectometry in single-mode fiber |url=https://ui.adsabs.harvard.edu/link_gateway/1981ApPhL..39..693E/doi:10.1063/1.92872 |journal=Applied Physics Letters |volume=39 |issue=9 |pages=693–695 |doi=10.1063/1.92872 |issn=0003-6951}}</ref><ref>{{Cite journal |last1=Gillard |first1=C. W. |last2=Buholz |first2=N. E. |title=Progress In Absolute Distance Interferometry |url=https://www.spiedigitallibrary.org/journals/optical-engineering/volume-22/issue-3/223348/Progress-In-Absolute-Distance-Interferometry/10.1117/12.7973117.full |journal=Optical Engineering |date=1983 |volume=22 |issue=3 |pages=348–353 |doi=10.1117/12.7973117 |issn=0091-3286}}</ref><ref>{{Cite journal |last1=Fercher |first1=A F. |last2=Roth |first2=E |editor-first1=Gerhard J. |editor-last1=Mueller |date=1986-09-15 |title=Ophthalmic Laser Interferometry |url=https://spie.org/Publications/Proceedings/Paper/10.1117/12.938523 |journal=SPIE Proceedings |series=Optical Instrumentation for Biomedical Laser Applications |volume=0658 |page=48 |publisher=SPIE |doi=10.1117/12.938523}}</ref><ref>{{Cite journal |last1=Youngquist |first1=Robert C. |last2=Carr |first2=Sally |last3=Davies |first3=D. E. N. |date=1987-03-01 |title=Optical coherence-domain reflectometry: a new optical evaluation technique |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-12-3-158 |journal=Optics Letters |language=EN |volume=12 |issue=3 |pages=158–160 |doi=10.1364/OL.12.000158 |issn=1539-4794}}</ref><ref>{{Cite journal |last1=Takada |first1=K. |last2=Yokohama |first2=I. |last3=Chida |first3=K. |last4=Noda |first4=J. |date=1987-05-01 |title=New measurement system for fault location in optical waveguide devices based on an interferometric technique |url=https://pubmed.ncbi.nlm.nih.gov/20454375 |journal=Applied Optics |volume=26 |issue=9 |pages=1603–1606 |doi=10.1364/AO.26.001603 |issn=1559-128X |pmid=20454375}}</ref><ref name=":5">{{Cite journal |last=Kachelmyer |first=A. L. |editor-first1=Richard J. |editor-last1=Becherer |date=1989-02-18 |title=Range-Doppler Imaging Waveforms And Receiver Design |url=https://www.spiedigitallibrary.org/conference-proceedings-of-spie/0999/0000/Range-Doppler-Imaging-Waveforms-And-Receiver-Design/10.1117/12.960231.full |journal=Laser Radar III |publisher=SPIE |volume=0999 |pages=138–161 |doi=10.1117/12.960231}}</ref><ref>{{Cite journal |last1=Fercher |first1=A. F. |last2=Mengedoht |first2=K. |last3=Werner |first3=W. |date=1988-03-01 |title=Eye-length measurement by interferometry with partially coherent light |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-13-3-186 |journal=Optics Letters |language=EN |volume=13 |issue=3 |pages=186–188 |doi=10.1364/OL.13.000186 |issn=1539-4794}}</ref><ref>{{Cite journal |last1=Gilgen |first1=H.H. |last2=Novak |first2=R.P. |last3=Salathe |first3=R.P. |last4=Hodel |first4=W. |last5=Beaud |first5=P. |title=Submillimeter optical reflectometry |url=https://ieeexplore.ieee.org/document/32387 |journal=Journal of Lightwave Technology |date=1989 |volume=7 |issue=8 |pages=1225–1233 |doi=10.1109/50.32387 |issn=1558-2213}}</ref><ref>{{Cite journal |last1=Huang |first1=D. |last2=Wang |first2=J. |last3=Lin |first3=C. P. |last4=Puliafito |first4=C. A. |last5=Fujimoto |first5=J. G. |date=1991 |title=Micron-resolution ranging of cornea anterior chamber by optical reflectometry |url=https://pubmed.ncbi.nlm.nih.gov/1816476/ |journal=Lasers in Surgery and Medicine |volume=11 |issue=5 |pages=419–425 |doi=10.1002/lsm.1900110506 |issn=0196-8092 |pmid=1816476}}</ref><ref>{{Cite journal |last=Hitzenberger |first=C. K. |date=March 1991 |title=Optical measurement of the axial eye length by laser Doppler interferometry |url=https://pubmed.ncbi.nlm.nih.gov/2001935/ |journal=Investigative Ophthalmology & Visual Science |volume=32 |issue=3 |pages=616–624 |issn=0146-0404 |pmid=2001935}}</ref><ref name=":2">{{cite conference |date=12–16 August 1990 |title=Ophthalmic interferometry |location=Garmisch-Partenkirchen, Germany |pages=221–228 |isbn=0-444-89860-3 |vauthors=Fercher AF |book-title=Proceedings of the International Conference on Optics in Life Sciences |veditors=von Bally G, Khanna S}}</ref><ref name=":3">{{cite conference |author1=Shinji Chiba |author2=Naohiro Tanno |year=1991 |title=Backscattering Optical Heterodyne Tomography |conference=14th Laser Sensing Symposium |language=ja}}</ref>  The potential to use interferometry for imaging was proposed,<ref name=":3" /> and measurement of [[retina]]l elevation profile and thickness had been demonstrated.<ref name=":2" />
+In the decade preceding the invention of OCT, interferometry with short-coherence-length light had been investigated for a variety of applications.<ref name=":4">{{Cite journal |last1=Eickhoff |first1=W. |last2=Ulrich |first2=R. |date=1981-11-01 |title=Optical frequency domain reflectometry in single-mode fiber |url=https://ui.adsabs.harvard.edu/link_gateway/1981ApPhL..39..693E/doi:10.1063/1.92872 |journal=Applied Physics Letters |volume=39 |issue=9 |pages=693–695 |doi=10.1063/1.92872 |issn=0003-6951}}</ref><ref>{{Cite journal |last1=Gillard |first1=C. W. |last2=Buholz |first2=N. E. |title=Progress In Absolute Distance Interferometry |url=https://www.spiedigitallibrary.org/journals/optical-engineering/volume-22/issue-3/223348/Progress-In-Absolute-Distance-Interferometry/10.1117/12.7973117.full |journal=Optical Engineering |date=1983 |volume=22 |issue=3 |pages=348–353 |doi=10.1117/12.7973117 |issn=0091-3286}}</ref><ref>{{Cite journal |last1=Fercher |first1=A F. |last2=Roth |first2=E |editor-first1=Gerhard J. |editor-last1=Mueller |date=1986-09-15 |title=Ophthalmic Laser Interferometry |url=https://spie.org/Publications/Proceedings/Paper/10.1117/12.938523 |journal=SPIE Proceedings |series=Optical Instrumentation for Biomedical Laser Applications |volume=0658 |page=48 |publisher=SPIE |doi=10.1117/12.938523}}</ref><ref>{{Cite journal |last1=Youngquist |first1=Robert C. |last2=Carr |first2=Sally |last3=Davies |first3=D. E. N. |date=1987-03-01 |title=Optical coherence-domain reflectometry: a new optical evaluation technique |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-12-3-158 |journal=Optics Letters |language=EN |volume=12 |issue=3 |pages=158–160 |doi=10.1364/OL.12.000158 |issn=1539-4794}}</ref><ref>{{Cite journal |last1=Takada |first1=K. |last2=Yokohama |first2=I. |last3=Chida |first3=K. |last4=Noda |first4=J. |date=1987-05-01 |title=New measurement system for fault location in optical waveguide devices based on an interferometric technique |url=https://pubmed.ncbi.nlm.nih.gov/20454375 |journal=Applied Optics |volume=26 |issue=9 |pages=1603–1606 |doi=10.1364/AO.26.001603 |issn=1559-128X |pmid=20454375}}</ref><ref name=":5">{{Cite journal |last=Kachelmyer |first=A. L. |editor-first1=Richard J. |editor-last1=Becherer |date=1989-02-18 |title=Range-Doppler Imaging Waveforms And Receiver Design |url=https://www.spiedigitallibrary.org/conference-proceedings-of-spie/0999/0000/Range-Doppler-Imaging-Waveforms-And-Receiver-Design/10.1117/12.960231.full |journal=Laser Radar III |publisher=SPIE |volume=0999 |pages=138–161 |doi=10.1117/12.960231}}</ref><ref>{{Cite journal |last1=Fercher |first1=A. F. |last2=Mengedoht |first2=K. |last3=Werner |first3=W. |date=1988-03-01 |title=Eye-length measurement by interferometry with partially coherent light |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-13-3-186 |journal=Optics Letters |language=EN |volume=13 |issue=3 |pages=186–188 |doi=10.1364/OL.13.000186 |issn=1539-4794}}</ref><ref>{{Cite journal |last1=Gilgen |first1=H.H. |last2=Novak |first2=R.P. |last3=Salathe |first3=R.P. |last4=Hodel |first4=W. |last5=Beaud |first5=P. |title=Submillimeter optical reflectometry |url=https://ieeexplore.ieee.org/document/32387 |journal=Journal of Lightwave Technology |date=1989 |volume=7 |issue=8 |pages=1225–1233 |doi=10.1109/50.32387 |issn=1558-2213}}</ref><ref>{{Cite journal |last1=Huang |first1=D. |last2=Wang |first2=J. |last3=Lin |first3=C. P. |last4=Puliafito |first4=C. A. |last5=Fujimoto |first5=J. G. |date=1991 |title=Micron-resolution ranging of cornea anterior chamber by optical reflectometry |url=https://pubmed.ncbi.nlm.nih.gov/1816476/ |journal=Lasers in Surgery and Medicine |volume=11 |issue=5 |pages=419–425 |doi=10.1002/lsm.1900110506 |issn=0196-8092 |pmid=1816476}}</ref><ref>{{Cite journal |last=Hitzenberger |first=C. K. |date=March 1991 |title=Optical measurement of the axial eye length by laser Doppler interferometry |url=https://pubmed.ncbi.nlm.nih.gov/2001935/ |journal=Investigative Ophthalmology & Visual Science |volume=32 |issue=3 |pages=616–624 |issn=0146-0404 |pmid=2001935}}</ref><ref name=":2">{{cite conference |date=12–16 August 1990 |title=Ophthalmic interferometry |location=Garmisch-Partenkirchen, Germany |pages=221–228 |isbn=0-444-89860-3 |vauthors=Fercher AF |book-title=Proceedings of the International Conference on Optics in Life Sciences |veditors=von Bally G, Khanna S}}</ref><ref name=":3">{{cite conference |author1=Shinji Chiba |author2=Naohiro Tanno |year=1991 |title=Backscattering Optical Heterodyne Tomography |conference=14th Laser Sensing Symposium |language=ja}}</ref>  These techniques had varying names, and some can be labeled 1-dimension OCT, but the most critical work is discussed in the introduction (next section).  This includes three 1981 papers, one 1986 paper, and three 1987 papers.  The potential to use interferometry for imaging was proposed,<ref name=":3" /> and measurement of [[retina]]l elevation profile and thickness had been demonstrated.<ref name=":2" />
 The initial commercial clinical OCT systems were based on point-scanning TD-OCT technology, which primarily produced [[Cross section (geometry)|cross-sectional]] images due to the speed limitation (tens to thousands of axial scans per second). Fourier-domain OCT became available clinically 2006, enabling much greater image acquisition rate (tens of thousands to hundreds of thousands axial scans per second) without sacrificing signal strength. The higher speed allowed for 3-dimensional imaging, which can be visualized in both en face and cross-sectional views. Novel contrasts such as [[angiography]], [[elastography]], and optoretinography also became possible by detecting signal change over time. Over the past 3 decades, the speed of commercial clinical OCT systems has increased more than 1000-fold, doubling every 3 years and rivaling the Moore’s law of computer chip performance. Development of parallel image acquisition approaches such as line-field and full-field technology may allow the performance improvement trend to continue.
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 ==Introduction==
 [[File:HautFingerspitzeOCT.gif|thumb|300px|Optical coherence tomogram of a fingertip. It is possible to observe the sweat glands, having "corkscrew appearance"]]
-Interferometric reflectometry of biological tissue, especially of the human eye using short-coherence-length light (also referred to as partially-coherent, low-coherence, or broadband, broad-spectrum, or white light) was investigated in parallel by multiple groups worldwide since 1980s. In 1991, David Huang, then a student in Prof. [[James Fujimoto]] laboratory at [[Massachusetts Institute of Technology]], working with Eric Swanson at the MIT Lincoln Laboratory and colleagues at the Harvard Medical School, successfully demonstrated imaging and called the new imaging modality "optical coherence tomography".<ref name=":1">{{Cite journal |last1=Huang |first1=D. |last2=Swanson |first2=E. A. |last3=Lin |first3=C. P. |last4=Schuman |first4=J. S. |last5=Stinson |first5=W. G. |last6=Chang |first6=W. |last7=Hee |first7=M. R. |last8=Flotte |first8=T. |last9=Gregory |first9=K. |last10=Puliafito |first10=C. A. |date=1991-11-22 |title=Optical coherence tomography |journal=Science |volume=254 |issue=5035 |pages=1178–1181 |doi=10.1126/science.1957169 |issn=0036-8075 |pmc=4638169 |pmid=1957169}}</ref> Since then, OCT with micrometer resolution and cross-sectional imaging capabilities has become a prominent biomedical imaging technique that has continually improved in technical performance and range of applications. The improvement in image acquisition rate is particularly spectacular, starting with the original 0.8 Hz axial scan repetition rate <ref name=":6" /> to the current commercial clinical OCT systems operating at several hundred kHz and laboratory prototypes at multiple MHz. The range of applications has expanded from ophthalmology to cardiology and other medical specialties. For their roles in the invention of OCT, Fujimoto, Huang, and Swanson received the 2023 Lasker-DeBakey Clinical Medical Research Award and the National Medal of Technology and Innovation. <ref>{{Cite journal |last=Davis |first=Tinsley H. |date=2023-09-26 |title=QnAs with James G. Fujimoto, David Huang, and Eric A. Swanson: Winners of the 2023 Lasker~DeBakey Clinical Medical Research Award |url=https://pnas.org/doi/10.1073/pnas.2313883120 |journal=Proceedings of the National Academy of Sciences |language=en |volume=120 |issue=39 |doi=10.1073/pnas.2313883120 |issn=0027-8424}}</ref> These developments have been reviewed in articles written for the general <ref name=":7" /> scientific <ref>{{Cite journal |last=Nathans |first=Jeremy |date=2023-09-26 |title=Seeing is believing: The development of optical coherence tomography |url=https://pnas.org/doi/10.1073/pnas.2311129120 |journal=Proceedings of the National Academy of Sciences |language=en |volume=120 |issue=39 |doi=10.1073/pnas.2311129120 |issn=0027-8424}}</ref> and medical <ref>{{Cite journal |last=Toth |first=Cynthia A. |date=2023-09-21 |editor-last=Phimister |editor-first=Elizabeth G. |title=Optical Coherence Tomography and Eye Care |url=http://www.nejm.org/doi/10.1056/NEJMcibr2307733 |journal=New England Journal of Medicine |volume=389 |issue=16 |pages=1526–1529 |language=en |doi=10.1056/NEJMcibr2307733 |issn=0028-4793}}</ref> readership.
+Interferometric reflectometry of biological tissue, especially of the human eye using short-coherence-length light (also referred to as partially-coherent, low-coherence, or broadband, broad-spectrum, or white light) was investigated in parallel by multiple groups worldwide since 1980s.  One dimensional OCT was demonstrated by three groups in 1981 but the technology would go under numerous names including low coherence interferometry (LCI)<ref>{{Cite journal |last=Fontaine |first=Joel J. |last2=Diels |first2=Jean-Claude |last3=Wang |first3=Ching-Yue |last4=Sallaba |first4=Harald |date=1981-09-01 |title=Subpicosecond-time-domain reflectometry |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-6-9-405 |journal=Optics Letters |language=EN |volume=6 |issue=9 |pages=405–407 |doi=10.1364/OL.6.000405 |issn=1539-4794}}</ref><ref>{{Cite journal |last=MacDonald |first=R. I. |date=1981-05-15 |title=Frequency domain optical reflectometer |url=https://opg.optica.org/ao/abstract.cfm?uri=ao-20-10-1840 |journal=Applied Optics |language=EN |volume=20 |issue=10 |pages=1840–1844 |doi=10.1364/AO.20.001840 |issn=2155-3165}}</ref><ref>{{Cite journal |last=Park |first=Heungsup |last2=Chodorow |first2=Marvin |last3=Kompfner |first3=Rudolf |date=1981-07-15 |title=High resolution optical ranging system |url=https://opg.optica.org/ao/abstract.cfm?uri=ao-20-14-2389 |journal=Applied Optics |language=EN |volume=20 |issue=14 |pages=2389–2394 |doi=10.1364/AO.20.002389 |issn=2155-3165}}</ref>. McDonald appears the first to use swept source reflectometry. These 1-D OCT were primarily used for assessing optical fibers so was 1-D.  Using a similar system, a team led by J. Fujimoto and E. Ippen would successfully image biological tissue with 1 D OCT<ref>{{Cite journal |last=Fujimoto |first=J. G. |last2=Puliafito |first2=C. A. |last3=Margolis |first3=R. |last4=Oseroff |first4=A. |last5=De Silvestri |first5=S. |last6=Ippen |first6=E. P. |date=1986-03-01 |title=Femtosecond optical ranging in biological systems |url=https://opg.optica.org/abstract.cfm?URI=ol-11-3-150 |journal=Optics Letters |language=en |volume=11 |issue=3 |pages=150 |doi=10.1364/OL.11.000150 |issn=0146-9592}}</ref>.  Three groups in 1987 would perform 1 dimensional OCT using a diode source and a Michelson interferometer including Danielson et.al., Takeda et.al., and Youngquistet.al. <ref>{{Cite journal |last=Takada |first=Kazumasa |last2=Yokohama |first2=Itaru |last3=Chida |first3=Kazumori |last4=Noda |first4=Juichi |date=1987-05-01 |title=New measurement system for fault location in optical waveguide devices based on an interferometric technique |url=https://opg.optica.org/ao/abstract.cfm?uri=ao-26-9-1603 |journal=Applied Optics |language=EN |volume=26 |issue=9 |pages=1603–1606 |doi=10.1364/AO.26.001603 |issn=2155-3165}}</ref><ref>{{Cite journal |last=Youngquist |first=Robert C. |last2=Carr |first2=Sally |last3=Davies |first3=D. E. N. |date=1987-03-01 |title=Optical coherence-domain reflectometry: a new optical evaluation technique |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-12-3-158 |journal=Optics Letters |language=EN |volume=12 |issue=3 |pages=158–160 |doi=10.1364/OL.12.000158 |issn=1539-4794}}</ref>.  In 1991, David Huang, then a student in Prof. [[James Fujimoto]] laboratory at [[Massachusetts Institute of Technology]], working with Eric Swanson at the MIT Lincoln Laboratory and colleagues at the Harvard Medical School, successfully demonstrated imaging and called the new imaging modality "optical coherence tomography".<ref name=":1">{{Cite journal |last1=Huang |first1=D. |last2=Swanson |first2=E. A. |last3=Lin |first3=C. P. |last4=Schuman |first4=J. S. |last5=Stinson |first5=W. G. |last6=Chang |first6=W. |last7=Hee |first7=M. R. |last8=Flotte |first8=T. |last9=Gregory |first9=K. |last10=Puliafito |first10=C. A. |date=1991-11-22 |title=Optical coherence tomography |journal=Science |volume=254 |issue=5035 |pages=1178–1181 |doi=10.1126/science.1957169 |issn=0036-8075 |pmc=4638169 |pmid=1957169}}</ref> Since then, OCT with micrometer resolution and cross-sectional imaging capabilities has become a prominent biomedical imaging technique that has continually improved in technical performance and range of applications. For ophthalmology, the improvement in image acquisition rate is particularly spectacular, starting with the original 0.8 Hz axial scan repetition rate <ref name=":6" /> to the current commercial clinical OCT systems operating at several hundred kHz and laboratory prototypes at multiple MHz. In 1993, after OCT had been unsuccessful in imaging non-transparent tissue, Mark Brezinski MD, PhD of Massachusetts General Hospital/Harvard Medical School proposed imaging at 1300 nm rather than 830 nm of the eye (after analyzing a 1989 scattering/absorption study by Parsa et.al in liver).<ref>{{Cite journal |last=Parsa |first=Parwane |last2=Jacques |first2=Steven L. |last3=Nishioka |first3=Norman S. |date=1989-06-15 |title=Optical properties of rat liver between 350 and 2200 nm |url=https://opg.optica.org/ao/abstract.cfm?uri=ao-28-12-2325 |journal=Applied Optics |language=EN |volume=28 |issue=12 |pages=2325–2330 |doi=10.1364/AO.28.002325 |issn=2155-3165}}</ref> A collaboration was established between Dr. Brezinski and Professor James Fujimoto and they successfully imaged artery as well as other scattering tissue (including neoplasia) and published in1996<ref>{{Cite journal |last=Brezinski |first=Mark E. |last2=Tearney |first2=Guillermo J. |last3=Bouma |first3=Brett E. |last4=Izatt |first4=Joseph A. |last5=Hee |first5=Michael R. |last6=Swanson |first6=Eric A. |last7=Southern |first7=James F. |last8=Fujimoto |first8=James G. |date=1996-03-15 |title=Optical Coherence Tomography for Optical Biopsy: Properties and Demonstration of Vascular Pathology |url=https://www.ahajournals.org/doi/10.1161/01.CIR.93.6.1206 |journal=Circulation |language=en |volume=93 |issue=6 |pages=1206–1213 |doi=10.1161/01.CIR.93.6.1206 |issn=0009-7322}}</ref> The most important technical advance for cardiology and other nontransparent tissue was likely the catheter/endoscope which required rapid alignment of two optical fibers with 8 µm cores (one rotating) across free space.  For their roles in the pioneering OCT in Ophthalmology; Fujimoto, Huang, and Swanson received, the 2023 Lasker-DeBakey Clinical Medical Research Award and the National Medal of Technology and Innovation. <ref>{{Cite journal |last=Davis |first=Tinsley H. |date=2023-09-26 |title=QnAs with James G. Fujimoto, David Huang, and Eric A. Swanson: Winners of the 2023 Lasker~DeBakey Clinical Medical Research Award |url=https://pnas.org/doi/10.1073/pnas.2313883120 |journal=Proceedings of the National Academy of Sciences |language=en |volume=120 |issue=39 |doi=10.1073/pnas.2313883120 |issn=0027-8424}}</ref> These developments have been reviewed in articles written for the general <ref name=":7" /> scientific <ref>{{Cite journal |last=Nathans |first=Jeremy |date=2023-09-26 |title=Seeing is believing: The development of optical coherence tomography |url=https://pnas.org/doi/10.1073/pnas.2311129120 |journal=Proceedings of the National Academy of Sciences |language=en |volume=120 |issue=39 |doi=10.1073/pnas.2311129120 |issn=0027-8424}}</ref> and medical <ref>{{Cite journal |last=Toth |first=Cynthia A. |date=2023-09-21 |editor-last=Phimister |editor-first=Elizabeth G. |title=Optical Coherence Tomography and Eye Care |url=http://www.nejm.org/doi/10.1056/NEJMcibr2307733 |journal=New England Journal of Medicine |volume=389 |issue=16 |pages=1526–1529 |language=en |doi=10.1056/NEJMcibr2307733 |issn=0028-4793}}</ref> readership.
 It is particularly suited to ophthalmic applications and other tissue imaging requiring micrometer resolution and millimeter penetration depth.<ref>{{cite journal | vauthors = Zysk AM, Nguyen FT, Oldenburg AL, Marks DL, Boppart SA | title = Optical coherence tomography: a review of clinical development from bench to bedside | journal = Journal of Biomedical Optics | volume = 12 | issue = 5 | pages = 051403 | year = 2007 | pmid = 17994864 | doi = 10.1117/1.2793736 | s2cid = 20621284 | bibcode = 2007JBO....12e1403Z | doi-access = free }}</ref>  OCT has also been used for various [[art conservation]] projects, where it is used to analyze different layers in a painting. OCT has interesting advantages over other medical imaging systems. [[Medical ultrasonography]], [[magnetic resonance imaging]] (MRI), confocal microscopy, and OCT are differently suited to morphological tissue imaging: while the first two have whole body but low resolution imaging capability (typically a fraction of a millimeter), the third one can provide images with resolutions well below 1 micrometer (i.e. sub-cellular), between 0 and 100 micrometers in depth, and the fourth can probe as deep as 500 micrometers, but with a lower (i.e. architectural) resolution (around 10 micrometers in lateral and a few micrometers in depth in ophthalmology, for instance, and 20 micrometers in lateral in endoscopy).<ref>{{cite journal | vauthors = Drexler W, Morgner U, Ghanta RK, Kärtner FX, Schuman JS, Fujimoto JG | title = Ultrahigh-resolution ophthalmic optical coherence tomography | journal = Nature Medicine | volume = 7 | issue = 4 | pages = 502–7 | date = April 2001 | pmid = 11283681 | pmc = 1950821 | doi = 10.1038/86589 }}</ref><ref>{{cite journal | vauthors = Kaufman SC, Musch DC, Belin MW, Cohen EJ, Meisler DM, Reinhart WJ, Udell IJ, Van Meter WS | display-authors = 6 | title = Confocal microscopy: a report by the American Academy of Ophthalmology | journal = Ophthalmology | volume = 111 | issue = 2 | pages = 396–406 | date = February 2004 | pmid = 15019397 | doi = 10.1016/j.ophtha.2003.12.002 }}</ref>
@@ Line 96: / Line 96: @@
 ===Fourier domain===
 [[File:Principle-TD-FD OCT.svg|thumb|450px|interference signals in TD vs. FD-OCT]]
-Fourier-domain (or Frequency-domain) OCT (FD-OCT) has speed and signal-to-noise ratio (SNR) advantages over time-domain OCT (TD-OCT) and has become the standard in the industry since 2006. The idea of using frequency modulation and coherent detection to obtain ranging information was already demonstrated in optical frequency domain reflectometry<ref name=":4" /> and laser radar<ref name=":5" /> in the 1980s, though the distance resolution and range were much longer than OCT. There are two types of FD-OCT - swept-source OCT (SS-OCT) and spectral-domain OCT (SD-OCT) – both of which acquire spectral interferograms which are then Fourier transformed to obtain an axial scan of reflectance amplitude versus depth. In SS-OCT, the spectral interferogram is acquired sequentially by tuning the wavelength of a laser light source. SD-OCT acquires spectral interferogram simultaneously in a spectrometer. An implementation of SS-OCT was described by the MIT group as early as 1994.<ref name=":0" /><ref>{{Cite journal |last1=Chinn |first1=S. R. |last2=Swanson |first2=E. A. |last3=Fujimoto |first3=J. G. |date=1997-03-01 |title=Optical coherence tomography using a frequency-tunable optical source |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-22-5-340 |journal=Optics Letters |language=EN |volume=22 |issue=5 |pages=340–342 |doi=10.1364/OL.22.000340 |issn=1539-4794}}</ref>   A group based in the University of Vienna described measurement of intraocular distance using both tunable laser and spectrometer-based interferometry as early as 1995.<ref>{{Cite journal |last1=Fercher |first1=A. F. |last2=Hitzenberger |first2=C. K. |last3=Kamp |first3=G. |last4=El-Zaiat |first4=S. Y. |date=1995-05-15 |title=Measurement of intraocular distances by backscattering spectral interferometry |url=https://dx.doi.org/10.1016/0030-4018%2895%2900119-S |journal=Optics Communications |volume=117 |issue=1 |pages=43–48 |doi=10.1016/0030-4018(95)00119-S |issn=0030-4018}}</ref><ref>{{Cite journal |last1=Lexer |first1=F. |last2=Hitzenberger |first2=C. K. |last3=Fercher |first3=A. F. |last4=Kulhavy |first4=M. |date=1997-09-01 |title=Wavelength-tuning interferometry of intraocular distances |url=https://opg.optica.org/ao/abstract.cfm?uri=ao-36-25-6548 |journal=Applied Optics |language=EN |volume=36 |issue=25 |pages=6548–6553 |doi=10.1364/AO.36.006548 |issn=2155-3165}}</ref> SD-OCT imaging was first demonstrated both in vitro and in vivo by a collaboration between the Vienna group and a group based in the Nicholas Copernicus University in a series of articles between 2000 and 2002.<ref>{{Cite journal |last1=Leitgeb |first1=R. |last2=Wojtkowski |first2=M. |last3=Kowalczyk |first3=A. |last4=Hitzenberger |first4=C. K. |last5=Sticker |first5=M. |last6=Fercher |first6=A. F. |date=2000-06-01 |title=Spectral measurement of absorption by spectroscopic frequency-domain optical coherence tomography |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-25-11-820 |journal=Optics Letters |language=EN |volume=25 |issue=11 |pages=820–822 |doi=10.1364/OL.25.000820 |issn=1539-4794}}</ref><ref>{{Cite journal |last1=Wojtkowski |first1=Maciej |last2=Leitgeb |first2=Rainer |last3=Kowalczyk |first3=Andrzej |last4=Bajraszewski |first4=Tomasz |last5=Fercher |first5=Adolf Friedrich |date=July 2002 |title=In vivo human retinal imaging by Fourier domain optical coherence tomography |url=https://www.spiedigitallibrary.org/journals/journal-of-biomedical-optics/volume-7/issue-3/0000/In-vivo-human-retinal-imaging-by-Fourier-domain-optical-coherence/10.1117/1.1482379.full |journal=Journal of Biomedical Optics |volume=7 |issue=3 |pages=457–463 |doi=10.1117/1.1482379 |issn=1083-3668}}</ref><ref>{{Cite journal |last1=Wojtkowski |first1=M. |last2=Kowalczyk |first2=A. |last3=Leitgeb |first3=R. |last4=Fercher |first4=A. F. |date=2002-08-15 |title=Full range complex spectral optical coherence tomography technique in eye imaging |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-27-16-1415 |journal=Optics Letters |language=EN |volume=27 |issue=16 |pages=1415–1417 |doi=10.1364/OL.27.001415 |issn=1539-4794}}</ref> The SNR advantage of FD-OCT over TD-OCT was analyzed by multiple groups of researchers in 2003.<ref>{{Cite journal |last1=Leitgeb |first1=R. |last2=Hitzenberger |first2=C. |last3=Fercher |first3=Adolf |date=2003-04-21 |title=Performance of fourier domain vs. time domain optical coherence tomography |url=https://pubmed.ncbi.nlm.nih.gov/19461802/ |journal=Optics Express |volume=11 |issue=8 |pages=889–894 |doi=10.1364/oe.11.000889 |issn=1094-4087 |pmid=19461802}}</ref><ref>{{Cite journal |last1=Choma |first1=Michael |last2=Sarunic |first2=Marinko |last3=Yang |first3=Changhuei |last4=Izatt |first4=Joseph |date=2003-09-08 |title=Sensitivity advantage of swept source and Fourier domain optical coherence tomography |url=https://pubmed.ncbi.nlm.nih.gov/19466106/ |journal=Optics Express |volume=11 |issue=18 |pages=2183–2189 |doi=10.1364/oe.11.002183 |issn=1094-4087 |pmid=19466106}}</ref><ref>{{Cite journal |last1=de Boer |first1=Johannes F. |last2=Cense |first2=Barry |last3=Park |first3=B. Hyle |last4=Pierce |first4=Mark C. |last5=Tearney |first5=Guillermo J. |last6=Bouma |first6=Brett E. |date=2003-11-01 |title=Improved signal-to-noise ratio in spectral-domain compared with time-domain optical coherence tomography |url=https://pubmed.ncbi.nlm.nih.gov/14587817/ |journal=Optics Letters |volume=28 |issue=21 |pages=2067–2069 |doi=10.1364/ol.28.002067 |issn=0146-9592 |pmid=14587817}}</ref>
+Fourier-domain (or Frequency-domain) OCT (FD-OCT) has speed and signal-to-noise ratio (SNR) advantages over time-domain OCT (TD-OCT) and has become the standard in the industry since 2006. The idea of using frequency modulation and coherent detection to obtain ranging information was already demonstrated in optical frequency domain reflectometry<ref name=":4" /> and laser radar<ref name=":5" /> in the 1980s, though the distance resolution and range were much longer than OCT. There are two types of FD-OCT - swept-source OCT (SS-OCT) and spectral-domain OCT (SD-OCT) – both of which acquire spectral interferograms which are then Fourier transformed to obtain an axial scan of reflectance amplitude versus depth. In SS-OCT, the spectral interferogram is acquired sequentially by tuning the wavelength of a laser light source. SD-OCT acquires spectral interferogram simultaneously in a spectrometer. A 1D frequency swept reflectometer was introduced in 1987, but this may not make the definition of OCT.<ref>{{Cite journal |last=MacDonald |first=R. Ian |last2=Ahlers |first2=Hildburg |date=1987-01-01 |title=Swept wavelength reflectometer for integrated-optic measurements |url=https://opg.optica.org/ao/abstract.cfm?uri=ao-26-1-114 |journal=Applied Optics |language=EN |volume=26 |issue=1 |pages=114–117 |doi=10.1364/AO.26.000114 |issn=2155-3165}}</ref> An implementation of SS-OCT was described by the MIT group as early as 1994.<ref name=":0" /><ref>{{Cite journal |last1=Chinn |first1=S. R. |last2=Swanson |first2=E. A. |last3=Fujimoto |first3=J. G. |date=1997-03-01 |title=Optical coherence tomography using a frequency-tunable optical source |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-22-5-340 |journal=Optics Letters |language=EN |volume=22 |issue=5 |pages=340–342 |doi=10.1364/OL.22.000340 |issn=1539-4794}}</ref>   A group based in the University of Vienna described measurement of intraocular distance using both tunable laser and spectrometer-based interferometry as early as 1995.<ref>{{Cite journal |last1=Fercher |first1=A. F. |last2=Hitzenberger |first2=C. K. |last3=Kamp |first3=G. |last4=El-Zaiat |first4=S. Y. |date=1995-05-15 |title=Measurement of intraocular distances by backscattering spectral interferometry |url=https://dx.doi.org/10.1016/0030-4018%2895%2900119-S |journal=Optics Communications |volume=117 |issue=1 |pages=43–48 |doi=10.1016/0030-4018(95)00119-S |issn=0030-4018}}</ref><ref>{{Cite journal |last1=Lexer |first1=F. |last2=Hitzenberger |first2=C. K. |last3=Fercher |first3=A. F. |last4=Kulhavy |first4=M. |date=1997-09-01 |title=Wavelength-tuning interferometry of intraocular distances |url=https://opg.optica.org/ao/abstract.cfm?uri=ao-36-25-6548 |journal=Applied Optics |language=EN |volume=36 |issue=25 |pages=6548–6553 |doi=10.1364/AO.36.006548 |issn=2155-3165}}</ref> SD-OCT imaging was first demonstrated both in vitro and in vivo by a collaboration between the Vienna group and a group based in the Nicholas Copernicus University in a series of articles between 2000 and 2002.<ref>{{Cite journal |last1=Leitgeb |first1=R. |last2=Wojtkowski |first2=M. |last3=Kowalczyk |first3=A. |last4=Hitzenberger |first4=C. K. |last5=Sticker |first5=M. |last6=Fercher |first6=A. F. |date=2000-06-01 |title=Spectral measurement of absorption by spectroscopic frequency-domain optical coherence tomography |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-25-11-820 |journal=Optics Letters |language=EN |volume=25 |issue=11 |pages=820–822 |doi=10.1364/OL.25.000820 |issn=1539-4794}}</ref><ref>{{Cite journal |last1=Wojtkowski |first1=Maciej |last2=Leitgeb |first2=Rainer |last3=Kowalczyk |first3=Andrzej |last4=Bajraszewski |first4=Tomasz |last5=Fercher |first5=Adolf Friedrich |date=July 2002 |title=In vivo human retinal imaging by Fourier domain optical coherence tomography |url=https://www.spiedigitallibrary.org/journals/journal-of-biomedical-optics/volume-7/issue-3/0000/In-vivo-human-retinal-imaging-by-Fourier-domain-optical-coherence/10.1117/1.1482379.full |journal=Journal of Biomedical Optics |volume=7 |issue=3 |pages=457–463 |doi=10.1117/1.1482379 |issn=1083-3668}}</ref><ref>{{Cite journal |last1=Wojtkowski |first1=M. |last2=Kowalczyk |first2=A. |last3=Leitgeb |first3=R. |last4=Fercher |first4=A. F. |date=2002-08-15 |title=Full range complex spectral optical coherence tomography technique in eye imaging |url=https://opg.optica.org/ol/abstract.cfm?uri=ol-27-16-1415 |journal=Optics Letters |language=EN |volume=27 |issue=16 |pages=1415–1417 |doi=10.1364/OL.27.001415 |issn=1539-4794}}</ref> The SNR advantage of FD-OCT over TD-OCT was analyzed by multiple groups of researchers in 2003.<ref>{{Cite journal |last1=Leitgeb |first1=R. |last2=Hitzenberger |first2=C. |last3=Fercher |first3=Adolf |date=2003-04-21 |title=Performance of fourier domain vs. time domain optical coherence tomography |url=https://pubmed.ncbi.nlm.nih.gov/19461802/ |journal=Optics Express |volume=11 |issue=8 |pages=889–894 |doi=10.1364/oe.11.000889 |issn=1094-4087 |pmid=19461802}}</ref><ref>{{Cite journal |last1=Choma |first1=Michael |last2=Sarunic |first2=Marinko |last3=Yang |first3=Changhuei |last4=Izatt |first4=Joseph |date=2003-09-08 |title=Sensitivity advantage of swept source and Fourier domain optical coherence tomography |url=https://pubmed.ncbi.nlm.nih.gov/19466106/ |journal=Optics Express |volume=11 |issue=18 |pages=2183–2189 |doi=10.1364/oe.11.002183 |issn=1094-4087 |pmid=19466106}}</ref><ref>{{Cite journal |last1=de Boer |first1=Johannes F. |last2=Cense |first2=Barry |last3=Park |first3=B. Hyle |last4=Pierce |first4=Mark C. |last5=Tearney |first5=Guillermo J. |last6=Bouma |first6=Brett E. |date=2003-11-01 |title=Improved signal-to-noise ratio in spectral-domain compared with time-domain optical coherence tomography |url=https://pubmed.ncbi.nlm.nih.gov/14587817/ |journal=Optics Letters |volume=28 |issue=21 |pages=2067–2069 |doi=10.1364/ol.28.002067 |issn=0146-9592 |pmid=14587817}}</ref>
 ====Spectral-domain OCT====
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 In the setting of cardiology,  OCT is used to image [[coronary arteries]] in order to visualize vessel wall lumen morphology and microstructure at a resolution 10 times higher than other existing modalities such as [[intravascular ultrasound]]s, and x-ray angiography ([[intracoronary optical coherence tomography]]). For this type of application, approximately 1&nbsp;mm in diameter fiber-optics catheters are used to access artery lumen through semi-invasive interventions such as [[percutaneous coronary intervention]]s.
-The first demonstration of endoscopic OCT was reported in 1997, by researchers in James Fujimoto laboratory at Massachusetts Institute of Technology, including Prof. [[Guillermo James Tearney]] and Prof. [[Brett Bouma]].<ref>{{cite journal | vauthors = Tearney GJ, Brezinski ME, Bouma BE, Boppart SA, Pitris C, Southern JF, Fujimoto JG | title = In vivo endoscopic optical biopsy with optical coherence tomography | journal = Science | volume = 276 | issue = 5321 | pages = 2037–9 | date = June 1997 | pmid = 9197265 | doi = 10.1126/science.276.5321.2037 | s2cid = 43035300 }}</ref> The first TD-OCT imaging catheter and system was commercialized by [[LightLab Imaging, Inc.]], a company based in Massachusetts in 2006. The first FD-OCT imaging study was reported by the laboratory of Prof. Guillermo J. Tearney and Prof. Brett Bouma based at [[Massachusetts General Hospital]] in 2008.<ref>{{cite journal | vauthors = Tearney GJ, Waxman S, Shishkov M, Vakoc BJ, Suter MJ, Freilich MI, Desjardins AE, Oh WY, Bartlett LA, Rosenberg M, Bouma BE | display-authors = 6 | title = Three-dimensional coronary artery microscopy by intracoronary optical frequency domain imaging | journal = JACC. Cardiovascular Imaging | volume = 1 | issue = 6 | pages = 752–61 | date = November 2008 | pmid = 19356512 | pmc = 2852244 | doi = 10.1016/j.jcmg.2008.06.007 }}</ref> Intravascular FD-OCT was first introduced in the market in 2009 by LightLab Imaging, Inc.<ref>{{cite web |url=http://www.prnewswire.com/news-releases/lightlab-imaging-returns-to-europcr-2010-with-strong-and-growing-worldwide-acceptance-of-c7-xr-oct-imaging-system-94607959.html |title=LightLab launches FD-OCT in Europe |access-date=9 September 2016}}</ref> and [[Terumo]] Corporation launched a second solution for coronary artery imaging in 2012. The higher imaging speed of FD-OCT enabled the widespread adoption of this imaging technology for coronary artery imaging. It is estimated that over 100,000 FD-OCT coronary imaging cases are performed yearly, and that the market is increasing by approximately 20% every year.<ref>{{cite web |url=http://www.bioopticsworld.com/articles/print/volume-9/issue-6/optical-coherence-tomography-beyond-better-clinical-care-oct-s-economic-impact.html |title=Optical Coherence Tomography: Beyond better clinical care: OCT's economic impact | vauthors = Swanson E |date=13 June 2016 |website=BioOptics World |access-date=9 September 2016}}</ref>
+In 1993, after OCT had been unsuccessful in imaging non-transparent tissue, Mark Brezinski MD, PhD proposed imaging at 1300 nm rather than 830 nm used in the eye.  A collaboration was established between Dr. Brezinski and Professor James Fujimoto and they successfully imaged artery as well as other scattering tissue in 1996 <ref>{{Cite journal |last=Brezinski |first=Mark E. |last2=Tearney |first2=Guillermo J. |last3=Bouma |first3=Brett E. |last4=Izatt |first4=Joseph A. |last5=Hee |first5=Michael R. |last6=Swanson |first6=Eric A. |last7=Southern |first7=James F. |last8=Fujimoto |first8=James G. |date=1996-03-15 |title=Optical Coherence Tomography for Optical Biopsy: Properties and Demonstration of Vascular Pathology |url=https://www.ahajournals.org/doi/10.1161/01.CIR.93.6.1206 |journal=Circulation |language=en |volume=93 |issue=6 |pages=1206–1213 |doi=10.1161/01.CIR.93.6.1206 |issn=0009-7322}}</ref>Students Micheal Hee and Postdoctoral fellow Joseph Izatt generated the first images with Dr. Brezinski (initially chicken and fish).  The first demonstration of endoscopic OCT was reported in 1997, by researchers in James Fujimoto laboratory at Massachusetts Institute of Technology and the Mark Brezinski Laboratory at Massachusetts General Hospital.  Other team members include pathologist James Southern MD, PhD, student [[Guillermo James Tearney]], student Micheal Hee, post-doctoral fellow Joe Izatt, and post-doctoral fellow [[Brett Bouma]].<ref>{{cite journal | vauthors = Tearney GJ, Brezinski ME, Bouma BE, Boppart SA, Pitris C, Southern JF, Fujimoto JG | title = In vivo endoscopic optical biopsy with optical coherence tomography | journal = Science | volume = 276 | issue = 5321 | pages = 2037–9 | date = June 1997 | pmid = 9197265 | doi = 10.1126/science.276.5321.2037 | s2cid = 43035300 }}</ref> The first TD-OCT imaging catheter and system was commercialized by [[LightLab Imaging, Inc.]], a company based in Massachusetts formed in 1997 by Fujimoto, Swanson, and Brezinski. The first FD-OCT imaging study was reported by the laboratory of Prof. Guillermo J. Tearney and Prof. Brett Bouma based at [[Massachusetts General Hospital]] in 2008.<ref>{{cite journal | vauthors = Tearney GJ, Waxman S, Shishkov M, Vakoc BJ, Suter MJ, Freilich MI, Desjardins AE, Oh WY, Bartlett LA, Rosenberg M, Bouma BE | display-authors = 6 | title = Three-dimensional coronary artery microscopy by intracoronary optical frequency domain imaging | journal = JACC. Cardiovascular Imaging | volume = 1 | issue = 6 | pages = 752–61 | date = November 2008 | pmid = 19356512 | pmc = 2852244 | doi = 10.1016/j.jcmg.2008.06.007 }}</ref> (Please explain.  Thorlabs was selling SS-OCT systems since at least 2007 and generating images) Intravascular FD-OCT was first introduced in the market in 2009 by LightLab Imaging, Inc.<ref>{{cite web |url=http://www.prnewswire.com/news-releases/lightlab-imaging-returns-to-europcr-2010-with-strong-and-growing-worldwide-acceptance-of-c7-xr-oct-imaging-system-94607959.html |title=LightLab launches FD-OCT in Europe |access-date=9 September 2016}}</ref> and [[Terumo]] Corporation launched a second solution for coronary artery imaging in 2012. The higher imaging speed of FD-OCT enabled the widespread adoption of this imaging technology for coronary artery imaging. It is estimated that over 100,000 FD-OCT coronary imaging cases are performed yearly, and that the market is increasing by approximately 20% every year.<ref>{{cite web |url=http://www.bioopticsworld.com/articles/print/volume-9/issue-6/optical-coherence-tomography-beyond-better-clinical-care-oct-s-economic-impact.html |title=Optical Coherence Tomography: Beyond better clinical care: OCT's economic impact | vauthors = Swanson E |date=13 June 2016 |website=BioOptics World |access-date=9 September 2016}}</ref>.  After two decades from the first in vivo studies, double blind prospective studies are being performed and showing morbidity/mortality benefits "Among patients with complex coronary-artery bifurcation lesions, OCT-guided PCI was associated with a lower incidence of MACE at 2 years than angiography-guided PCI."<ref>{{Cite journal |last=Holm |first=Niels R. |last2=Andreasen |first2=Lene N. |last3=Neghabat |first3=Omeed |last4=Laanmets |first4=Peep |last5=Kumsars |first5=Indulis |last6=Bennett |first6=Johan |last7=Olsen |first7=Niels T. |last8=Odenstedt |first8=Jacob |last9=Hoffmann |first9=Pavel |last10=Dens |first10=Jo |last11=Chowdhary |first11=Saqib |last12=O’Kane |first12=Peter |last13=Bülow Rasmussen |first13=Søren-Haldur |last14=Heigert |first14=Matthias |last15=Havndrup |first15=Ole |date=2023-10-19 |title=OCT or Angiography Guidance for PCI in Complex Bifurcation Lesions |url=http://www.nejm.org/doi/10.1056/NEJMoa2307770 |journal=New England Journal of Medicine |language=en |volume=389 |issue=16 |pages=1477–1487 |doi=10.1056/NEJMoa2307770 |issn=0028-4793}}</ref>
 Intravascular OCT has been investigated for use in neurovascular applications, too, including imaging for guiding endovascular treatment of ischemic stroke and brain aneurysms.<ref>{{cite journal | vauthors = Chen CJ, Kumar JS, Chen SH, Ding D, Buell TJ, Sur S, Ironside N, Luther E, Ragosta M, Park MS, Kalani MY, Liu KC, Starke RM | display-authors = 6 | title = Optical Coherence Tomography: Future Applications in Cerebrovascular Imaging | journal = Stroke | volume = 49 | issue = 4 | pages = 1044–1050 | date = April 2018 | pmid = 29491139 | doi = 10.1161/STROKEAHA.117.019818 | doi-access = free }}</ref> Clinical use has been limited to proximal intracranial anatomy of patient with limited tortuosity, showing the potential of OCT for the imaging of neurovascular disease.<ref>{{cite journal | vauthors = Xu X, Li M, Liu R, Yin Q, Shi X, Wang F, Gao J, Xu G, Ye R, Liu X | display-authors = 6 | title = Optical coherence tomography evaluation of vertebrobasilar artery stenosis: case series and literature review | journal = Journal of NeuroInterventional Surgery | volume = 12 | issue = 8 | pages = 809–813 | date = August 2020 | pmid =  32066569| doi = 10.1136/neurintsurg-2019-015660 | s2cid = 211159079 | url = https://jnis.bmj.com/content/12/8/809 }}</ref> An intravascular OCT imaging catheter design tailored for use in tortuous neurovascular anatomy has been proposed in 2020.<ref>{{cite journal | vauthors = Ughi GJ, Marosfoi MG, King RM, Caroff J, Peterson LM, Duncan BH, Langan ET, Collins A, Leporati A, Rousselle S, Lopes DK, Gounis MJ, Puri AS | display-authors = 6 | title = A neurovascular high-frequency optical coherence tomography system enables in situ cerebrovascular volumetric microscopy | journal = Nature Communications | volume = 11 | issue = 1 | pages = 3851 | date = July 2020 | pmid = 32737314 | pmc = 7395105 | doi = 10.1038/s41467-020-17702-7 | bibcode = 2020NatCo..11.3851U }}</ref>

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