Orbital x-ray: Difference between revisions
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==Positioning== |
==Positioning== |
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The x-ray can be taken with the patient in either an erect or supine position, although most usually erect. |
The x-ray can be taken with the patient in either an erect or supine position, although most usually erect. |
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The x-ray is taken PA (postero-antero), meaning that the patient faces towards the reciever and away from the x-rays source. The patients chin rests on the image reciever, which tilts the head up allowing the orbits to be clear of the internal structure of the [[Petrous |
The x-ray is taken PA (postero-antero), meaning that the patient faces towards the reciever and away from the x-rays source. The patients chin rests on the image reciever, which tilts the head up allowing the orbits to be clear of the internal structure of the [[Petrous ridge]]. This view is called Occipital-Mental or OM. |
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An orbital x-ray usually requires only one view unless the requester is looking for evidence of metallic fragments, in which case two projections can be made. One with the eyes looking up, one with the eyes looking down. These views will show any movement of fragments and helps rule out false positives / artefacts which may be present on the image reciever. |
An orbital x-ray usually requires only one view unless the requester is looking for evidence of metallic fragments, in which case two projections can be made. One with the eyes looking up, one with the eyes looking down. These views will show any movement of fragments and helps rule out false positives / artefacts which may be present on the image reciever. |
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Revision as of 18:16, 27 March 2013
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Definition
Orbital x-ray or orbital radiography is an x-ray of both left and right eye sockets, to include the Frontal Sinuses and Maxillary Sinuses.
Positioning
The x-ray can be taken with the patient in either an erect or supine position, although most usually erect. The x-ray is taken PA (postero-antero), meaning that the patient faces towards the reciever and away from the x-rays source. The patients chin rests on the image reciever, which tilts the head up allowing the orbits to be clear of the internal structure of the Petrous ridge. This view is called Occipital-Mental or OM.
An orbital x-ray usually requires only one view unless the requester is looking for evidence of metallic fragments, in which case two projections can be made. One with the eyes looking up, one with the eyes looking down. These views will show any movement of fragments and helps rule out false positives / artefacts which may be present on the image reciever.
Uses
It is useful for detecting fractures of the surrounding bone arising from injury or disease. It is also commonly used for detecting foreign objects in the eye that an ophthalmoscope cannot detect and is sometimes given prior to an MRI where metal fragments could cause significant damage.