Radiation response characteristics of amorphous silicon arrays for megavoltage radiotherapy imaging

Signal measurements for a variety of pixelated a-Si:H imaging arrays irradiated by megavoltage beams are reported. Data are presented for 6-, 10-, and 15-MV beam energies for screens containing gadolinium-oxysulfide and calcium tungstate. These results are the first quantitative radiation signal sizes reported for such arrays. In addition, the initialization times of these arrays are reported. The performances of arrays of various sizes and pitches with respect to these measured values are compared. These results are part of an ongoing effort to develop flat-panel, real-time gamma and X-ray imagers.<
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