(acronym for computerized axial tomography)
in medicine, a sophisticated method of X- ray
imaging. Quick and noninvasive, CAT scanning
is an aid to diagnosis, helping to pinpoint
problem areas without the need for
exploratory surgery. The CAT scanner passes a
narrow fan of X-rays through successive
slices of the suspect body part. These slices
are picked up by crystal detectors in a
scintillator and converted electronically
into cross-sectional images displayed on a
viewing screen. Gradually, using views taken
from various angles, a three- dimensional
picture of the organ or tissue can be built
up and suspect irregularities analysed.