title: The vacuum cassette for improved linear accelerator portal films.
abstract: The use of a commercially available vacuum cassette with lead screens for linear accelerator portal films is described. The vacuum cassette technique provides improved quality with no increase in patient discomfort or cost and avoids gemoetric distortion, compared to other currently available methods.
mesh_terms: D006801:Humans; D010315:Particle Accelerators / Q000295:instrumentation*; D011878:Radiotherapy / Q000191:economics / Q000295:instrumentation*; D011882:Radiotherapy, High-Energy / Q000191:economics; D014618:Vacuum