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Titolo:
DIGITAL RADIOLOGY USING ACTIVE-MATRIX READOUT OF AMORPHOUS SELENIUM -CONSTRUCTION AND EVALUATION OF A PROTOTYPE REAL-TIME DETECTOR
Autore:
ZHAO W; BLEVIS I; GERMANN S; ROWLANDS JA; WAECHTER D; HUANG ZS;
Indirizzi:
UNIV TORONTO,SUNNYBROOK HLTH SCI CTR,DEPT MED BIOPHYS,RES BLDG,ROOM S635,2075 BAYVIEW AVE TORONTO ON M4N 3M5 CANADA LITTON SYST CANADA LTD ETOBICOKE ON M9W 5A7 CANADA
Titolo Testata:
Medical physics
fascicolo: 12, volume: 24, anno: 1997,
pagine: 1834 - 1843
SICI:
0094-2405(1997)24:12<1834:DRUARO>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
IMAGE SENSOR; RESOLUTION; ARRAYS; RADIOGRAPHY;
Keywords:
AMORPHOUS SELENIUM; FLAT-PANEL DETECTOR; REAL-TIME; X-RAY IMAGING; ACTIVE MATRIX; TFT ARRAY; DQE; MTF; NPS;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
23
Recensione:
Indirizzi per estratti:
Citazione:
W. Zhao et al., "DIGITAL RADIOLOGY USING ACTIVE-MATRIX READOUT OF AMORPHOUS SELENIUM -CONSTRUCTION AND EVALUATION OF A PROTOTYPE REAL-TIME DETECTOR", Medical physics, 24(12), 1997, pp. 1834-1843

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 thea-Se layer is electronically read out in situ using a two dimensionalarray 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. Inthis 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 factorsaffecting the imaging performance and methods of improvement in the future are discussed. (C) 1997 American Association of Physicists in Medicine.

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Documento generato il 30/11/20 alle ore 16:08:29