title: A wedge filter interlock system for 4 MV linear accelerators.
abstract: The wedge filter interlock system on a 4 MV linear accelerator was modified to ensure proper selection and placement of filter. By using a series of microswitches to replace the two-pin connection for each wedge, proper placement of the wedge in the treatment beam was ensured. Both the chain and plug were eliminated by using a 6 pole, 6 position sub-miniature rotary switch to produce the remaining connections.
mesh_terms: D005374:Filtration / Q000295:instrumentation; D006801:Humans; D011882:Radiotherapy, High-Energy / Q000295:instrumentation*