Published in Medical Devices and Surgical Technology Week, February 6th, 2005
"Most electronic portal imaging devices (EPIDs) developed to date, including recently developed flat panel systems, have low X-ray absorption, i.e., low quantum efficiency (QE) of 2%-4% as compared to the theoretical limit of 100%," scientists in Canada explained. "A significant increase of QE is desirable for applications such as a megavoltage cone-beam computed tomography (MVCT) and megavoltage fluoroscopy."
"However, the spatial resolution of an imaging system usually decreases significantly with an increase of QE," noted G. Pang and colleagues at the University...
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