What is CT?

"Computed tomography (formerly known as computerized axial tomography or CAT scan) measures the weakening, or attenuation, of x-ray beams as they pass through sections of an object from hundreds of different angles. From the evidence of these measurements, a computer is able to reconstruct two and three dimensional images of the objects interior." (Eisenberg, 1992)

1992 Eisenberg, E. L. Radiology. An Illustrated History, A. S. Patterson (ed.), Mosby Year Book, pp. 467-468.