Emission computed tomography

Emission computed tomography
ICD-9-CM	92.0-92.1
MeSH	D014055
OPS-301 code	3-72-3-75

Emission computed tomography (ECT) is a type of tomography involving radioactive emissions.

Types include positron emission tomography (PET) and Single-photon emission computed tomography (SPECT).

The imaging agent used in SPECT emits gamma rays, as opposed to the positron emitters (such as ¹⁸F) used in PET. There are a range of radiotracers (such as ^99mTc, ¹¹¹In, ¹²³I, ²⁰¹Tl) that can be used, depending on the specific application.