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Contrast enhancement of high-energy radiotherapy films

Department of Radiation Oncology, Rhode Island Hospital, Providence, Rhode Island, 02902, and Section on Radiation Medicine, Brown University USA

An order-of-magnitude improvement in the contrast of high-energy localization and verification films has been achieved through the application of a simple, inexpensive, contrast enhancement technique. The method involves making reversal contact "prints" of the original film onto ordinary X-ray film with equipment commonly available in any radiotherapy department. This results in "gamma multiplication". The theory as well as several applications of this effect are presented.

Received for publication December 1, 1978. Revision received April 1, 1979.