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  • Photon radiation detectors designed for sensing the position of photon beams used in radiotherapy treatments. These detectors typically consist of a stand-alone or handheld instrument, controls, and a display that shows an image with the position of the photon radiation beam. Some detectors are based on a technology that includes a gaseous detector with metal converters and gas electron multipliers (GEMs); detectors based on amorphous silicon technology (i.e., electronic portal imaging devices/EPIDs) are also available. Radiotherapy photon radiation detectors are intended for use in complex radiotherapy treatments (e.g., cone beam computed tomography radiotherapy) to improve the positioning and accurate delivery of photon radiation; they may be also used in conventional x-ray treatments.
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