Radiographic Enlargements in Diagnostic Radiology

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Abstract
An enlarged radiographic image may be produced by geometrical or optical methods. The geometrical method produces minor degrees of enlargement only, but is of value for those regions of the body in the radiography of which intensifying screens are normally used. An optical method is described, whereby enlargements of eight diameters can be produced for diagnostic purposes. Several films and developers can be employed, the most useful combination being fine grain industrial film in conjunction with a super fine grain developer. The use of the latter necessitates a considerable increase of exposure time. For example, the original radiographs for Figs. 2, 3, 4 and 5 were taken on Crystallex film using an exposure in the region of 45 kV 800 mAS at 36 in. Development was for 10–12 minutes in Johnsons' super fine grain developer at 68°F. (20°C.) Subsequent enlargements in the form of positive transparencies were made on to Process film, using a photographic enlarger. The method is at present limited to the extremities but is of value in the illustration of small lesions and in the study and investigation of selected cases.

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