Development of high quantum efficiency, flat panel, thick detectors for megavoltage x-ray imaging: an experimental study of a single-pixel prototype.
Our overall goal is to develop a new generation of electronic portal imaging devices (EPIDs) with a quantum efficiency (QE) more than an order of magnitude higher and a spatial resolution equivalent to that of EPIDs currently used for portal imaging. A novel design of such a high QE flat-panel based EPID was introduced recently and its feasibility was investigated theoretically [see Pang and Rowlands, Med. Phys. 31, 3004 (2004)]. In this work, we constructed a prototype single-pixel detector based on the novel design. Some fundamental imaging properties including the QE, spatial resolution, and sensitivity of the prototype detector were measured with a 6 MV beam. It has been shown that the experimental results agree well with theoretical predictions and further development based on the novel design including the construction of a prototype area detector is warranted.
Mei
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Toronto-Sunnybrook Regional Cancer Centre, 2075 Bayview Avenue, Toronto M4N 3M5, Canada.
Pang
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D002138:Calibration; D004307:Dose-Response Relationship, Radiation; D004583:Electrons; D004867:Equipment Design; D015233:Models, Statistical; D019047:Phantoms, Imaging; D011312:Pressure; D011856:Radiographic Image Enhancement; D011874:Radiometry; D011879:Radiotherapy Dosage; D011880:Radiotherapy Planning, Computer-Assisted; D011882:Radiotherapy, High-Energy; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013997:Time Factors; D014963:X-Ray Intensifying Screens; D014965:X-Rays; D014978:Xenon
D014978:Xenon