by one of two methods: by digitizing X-ray films; or by having the
X-rays that pass through the patient fall directly onto devices (such as a phosphor screen) that convert X-rays
to light. The light signal in turn is captured by a light-sensitive digitizing system.
Angiography is another major application in an area called contrast enhancement radiography. This
procedure is used to obtain images (called angiograms) of blood vessels.
Perhaps the best known of all uses of X-rays in medical imaging is computerized axial tomography. Due to
their resolution and 3-D capabilities, CAT scans revolutionized medicine from the moment they first became
available in