title: A digital image processing system for high energy X-ray portal images.
abstract: The technique of conventional digital image processing is applied to high energy X-ray portal films. The system, which does not use state-of-the-art equipment, is analysed to determine its adequacy for such applications. Although inferior to film, notably in spatial resolution, it is found to be useful in the improvement of radiotherapy portal films.
mesh_terms: D000703:Analog-Digital Conversion; D006801:Humans; D011856:Radiographic Image Enhancement / Q000295:instrumentation*; D011882:Radiotherapy, High-Energy / Q000379:methods*