Tomography — theory and equipment

Abstract

Unlike a normal radiograph where the degree of radiographic unsharpness throughout the part of the body being radiographed remains more or less constant, a tomogram has one selected plane in which the degree of unsharpness is less than that of the planes above and below it. That is to say, the planes above and below the selected plane in the body become progressively more and more blurred as the distance increases above and below the selected plane.