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Old 05-14-2003, 01:40 PM   #3
russotto
Professor
 
Join Date: Jan 2001
Posts: 1,788
A CT scan does use X-rays. (manufacturers dropped the "A" for Axial some time ago, probably when they added spiral). But it uses them to generate a 3D dataset representing the scanned object, not a simple 2D image. For some reason they've done a projection through the dataset to produce an image which looks like a regular X-ray, but you can actually slice it any way you want to.
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