title: Contrast enhancement of high-energy radiotherapy films.
abstract: An order-of-magnitude improvment 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 fi-m 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.
mesh_terms: D006801:Humans; D011856:Radiographic Image Enhancement / Q000379:methods*; D011882:Radiotherapy, High-Energy / Q000295:instrumentation*