Radiology, the youngest of the major medical sciences, has undergone an extraordinary technical evolution since the discovery of X-rays. It began with the development of the different types of tomography and the adoption of many contrast agents, then proceeded rapidly to serioscopy, subtraction of images, direct enlargement, echography, thermography, and xerography. Today, even before all these innovations have come into common use, another branch of radiologic technology has evolved: computerized (axial) tomography. More than just an innovation, its true dimensions are unfore seeable....