Magnification technic in roentgenography of the chest.

Abstract

The purpose of this report is to point out the usefulness of the magnification technic in roentgenography of the chest. In recent years, methods of enlarging the roentgenographic image to improve diagnostic accuracy have gained in popularity, particularly with the advent of the 0.3-mm. focal spot roentgen tube, which has made this type of examination technically more feasible. For the most part, use of this technic has been confined to magnification of images of skeletal parts (1, 2). It is not generally appreciated that it may also be applied to pulmonary roentgenography. Technic Because of the long exposures believed to be necessary with the magnification technic, its use has been limited to parts which can be immobilized and it has seemed to be precluded in chest radiography where respiratory motion is always a problem. It is accepted that exposure times of one-tenth to one-thirtieth of a second are necessary to overcome this difficulty. While this is easily accomplished with high-energy equipment in t...