An Analysis of the end-Result: the Radiograph

Abstract

ASSUMING that a clean film, free from fog of any kind, be selected; that proper screens, free from marks, scratches or blemishes, be selected, and that proper dark room procedure, including properly selected chemicals, proper temperatures, proper time factors and safe dark room light, be used, there remain four factors which contribute to the quality of the end-result—the radiograph: First, distortion; second, detail; third, contrast; fourth, radiographic density. A thorough understanding of the various methods that control the above four factors will contribute much toward the control of the quality of the end-result. First, Distortion. — Distortion may be defined, from a radiographic standpoint, as a variation in the size or shape of an object as shown on the film from its true size or shape. Distortion may consist of, (1) true distortion, in which the shape of the object shown is distorted or twisted from its true shape, or (2) magnified distortion, in which the size of the object shown is magnified or...