A method for calculating the spinal-cord depth from an oblique simulator radiograph.
An equation for calculating the spinal-cord depth from a simulator radiograph taken at an oblique angle has been derived. This equation is very useful when the cord cannot easily be identified on a horizontal lateral radiograph as in the case of the lower neck and upper thorax. To use this equation one needs to know the following parameters: the source-Axis-Distance, vertical source-skin-distance, the gantry angle at which the film was taken, and the target-film-distance.
Chen
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FS
British Columbia Cancer Agency, Victoria Clinic, Clinical Physics Department, Canada.
Watkins
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D
D006801:Humans; D008961:Models, Structural; D011859:Radiography; D011879:Radiotherapy Dosage; D013116:Spinal Cord / Q000000981:diagnostic imaging / Q000528:radiation effects*