PMID: 9434966Jan 22, 1998Paper

Digital radiology using active matrix readout of amorphous selenium: construction and evaluation of a prototype real-time detector

Medical Physics
W ZhaoZ Huang

Abstract

The goal of the present work is to develop a large area, flat-panel solid-state detector for both digital radiography and fluoroscopy. The proposed detector employs a photoconductive layer of amorphous selenium (a-Se) to convert x rays into charge. The charge image formed by the a-Se layer is electronically read out in situ using a two dimensional array of thin film transistors (TFTs), or active matrix. Since the active matrix readout is capable of producing x-ray images in real-time, it can potentially be applied in both radiography and fluoroscopy. In this paper, the imaging performance of this concept is investigated using a prototype x-ray imaging detector. The designs for the active matrix, the peripheral electronic circuits, and the image acquisition system are described. Measurements of x-ray imaging properties of the prototype detector, i.e., x-ray sensitivity, presampling modulation transfer function (MTF), and noise power spectrum (NPS), were performed, and from which the spatial frequency dependent detective quantum efficiency (DQE) of the prototype was derived. The experimental results are in agreement with the results of our theoretical analysis. The factors affecting the imaging performance and methods of improvem...Continue Reading

Citations

Feb 13, 2001·Journal of Magnetic Resonance Imaging : JMRI·R FahrigN J Pelc
May 19, 2006·European Radiology·Yoshihisa HatakeyamaWataru Miyamoto
Aug 30, 2008·Physics in Medicine and Biology·G K YadavaD R Bednarek
Aug 23, 2000·AJR. American Journal of Roentgenology·D P FrushH G Chotas
Jul 29, 2006·Medical Physics·Giovanni BorasiDavide Tassoni
Feb 26, 2008·Medical Physics·J C Blakesley, R Speller
Nov 23, 2006·Radiology·H Page McAdamsCarl E Ravin
Jan 1, 2010·Academic Radiology·Hany KashaniJeffrey H Siewerdsen
Dec 29, 2000·IEEE Transactions on Medical Imaging·R NingY Ning
Oct 4, 2016·Radiological Physics and Technology·Lutfi Ergun, Turan Olgar
Sep 29, 1999·Medical Physics·Y El-MohriJ H Siewerdsen
Jun 12, 2004·Medical Physics·Srinivasan VedanthamSankararaman Suryanarayanan
Aug 9, 2003·Medical Physics·Giovanni BorasiDavide Tassoni
Jan 10, 2004·Medical Physics·Jean-Pierre BissonnetteI A Cunningham
Dec 5, 2002·Medical Physics·J H SiewerdsenD A Jaffray
Jan 23, 2018·Korean Journal of Radiology : Official Journal of the Korean Radiological Society·Kum Ju ChaeSoon Ho Yoon
Aug 6, 1999·Medical Physics·M B WilliamsP U Simoni

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