Performance of a direct-detection active matrix flat panel dosimeter (AMFPD) for IMRT measurements

Medical Physics
Yu ChenBenedick A Fraass

Abstract

The dosimetric performance of a direct-detection active matrix flat panel dosimeter (AMFPD) is reported for intensity modulated radiation therapy (IMRT) measurements. The AMFPD consists of a-Si : H photodiodes and thin-film transistors deposited on a glass substrate with no overlying scintillator screen or metal plate. The device is operated at 0.8 frames per second in a continuous acquisition or fluoroscopic mode. The effect of the applied bias voltage across the photodiodes on the response of the AMFPD was evaluated because this parameter affects dark signal, lag contributions, and pixel sensitivity. In addition, the AMPFD response was evaluated as a function of dose, dose rate, and energy, for static fields at 10 cm depth. In continuous acquisition mode, the AMFPD maintained a linear dose response (r2 > 0.99999) up to at least 1040 cGy. In order to obtain reliable integrated dose results for IMRT fields, the effects of lag on the radiation signal were minimized by operating the system at the highest frame rate and at an appropriate reverse bias voltage. Segmental MLC and dynamic MLC IMRT fields were measured with the AMFPD, and the results were compared to film, using standard methods for reliable film dosimetry. Both AMFPD ...Continue Reading

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Citations

Nov 4, 2011·Medical Physics·Helen GustafssonPeter B Greer
Jun 1, 2014·Medical & Biological Engineering & Computing·Mahsheed SabetPeter B Greer
Apr 28, 2011·Medical Physics·Daniel A LowMark Oldham
Nov 12, 2009·Physics in Medicine and Biology·Philip VialPeter B Greer
Jul 18, 2012·Physics in Medicine and Biology·Mahsheed SabetPeter B Greer
Jul 28, 2016·Journal of Applied Clinical Medical Physics·Kelly C YoungeMartha M Matuszak

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