PMID: 9434965Jan 22, 1998Paper

Digital radiology using active matrix readout of amorphous selenium: theoretical analysis of detective quantum efficiency

Medical Physics
Wei Zhao, J A Rowlands

Abstract

A flat-panel x-ray imaging detector using a layer of amorphous selenium (a-Se) for direct conversion of x rays (to charge) and an active matrix for self-scanned readout is being investigated for digital radiology. A theoretical analysis of the spatial frequency dependent detective quantum efficiency (DQE(f)) of the self-scanned a-Se detector is performed based on a model of signal and noise propagation in a cascaded imaging system. Because of the high intrinsic resolution of a-Se and the pixelated active matrix readout method, such detectors are inherently undersampled and aliasing is present. The presampling modulation transfer function (MTF) and aliased noise power spectrum (NPS) of the detector were used in the analysis of DQE(f). It is proven that the aliased NPS for the self-scanned a-Se detectors is white. Since the shape of DQE(f) is determined by the ratio of MTF squared and the NPS, the shape of DQE(f) follows the square of the presampling MTF of the detector as a result of the white NPS. The analysis also shows that DQE(0) is proportional to the pixel fill factor, i.e., the fraction of each pixel area used for image charge collection. The DQE analysis is applied to detector parameters for three x-ray imaging applicati...Continue Reading

References

May 1, 1987·Journal of the Optical Society of America. A, Optics and Image Science·M RabbaniR Van Metter
May 1, 1987·Journal of the Optical Society of America. A, Optics and Image Science·P C BunchR Van Metter
Mar 1, 1984·Medical Physics·J A Rowlands
Apr 1, 1995·Medical Physics·W Que, J A Rowlands
Jan 1, 1997·Medical Physics·M S WestmoreI A Cunningham

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Citations

Sep 15, 2012·Nihon Hoshasen Gijutsu Gakkai zasshi·Hiroshi KunitomoKazuya Ohashi
Apr 4, 2008·Medical Physics·Samuel Richard, Jeffrey H Siewerdsen
Sep 13, 2006·Medical Physics·Aili K BloomquistDaniel J Beideck
Mar 17, 2010·Medical Physics·Andrew Kuhls-GilcristStephen Rudin
Sep 15, 2009·Medical Physics·Daniel J Tward, Jeffrey H Siewerdsen
Jan 30, 2009·Medical Physics·Bo Zhao, Wei Zhao
Jan 30, 2009·Medical Physics·Justin L Ducote, Sabee Molloi
Jan 30, 2009·Medical Physics·Daniel J Tward, Jeffrey H Siewerdsen
Sep 4, 2012·Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment·Jeffrey H Siewerdsen
Oct 4, 2000·IEEE Engineering in Medicine and Biology Magazine : the Quarterly Magazine of the Engineering in Medicine & Biology Society·X Cao, H K Huang
Feb 15, 2005·IEEE Transactions on Medical Imaging·Mike Sattarivand, I A Cunningham

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