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Titolo:
Study of CdTe and CdZnTe detectors for X-ray computed tomography
Autore:
Ricq, S; Glasser, F; Garcin, M;
Indirizzi:
CEA G, Dept Syst, LETI, F-38054 Grenoble 9, France CEA G Grenoble France9 A G, Dept Syst, LETI, F-38054 Grenoble 9, France
Titolo Testata:
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT
fascicolo: 1-2, volume: 458, anno: 2001,
pagine: 534 - 543
SICI:
0168-9002(20010201)458:1-2<534:SOCACD>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
NUCLEAR-DETECTORS; CD1-XZNXTE;
Keywords:
X-ray computed tomography; CdTe and CdZnTe detectors; intense irradiation; trapping/de-trapping; space charge; injection;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
17
Recensione:
Indirizzi per estratti:
Indirizzo: Glasser, F CEA G, Dept Syst, LETI, 17 Rue Martyrs, F-38054 Grenoble 9, France CEA G 17 Rue Martyrs Grenoble France 9 8054 Grenoble 9, France
Citazione:
S. Ricq et al., "Study of CdTe and CdZnTe detectors for X-ray computed tomography", NUCL INST A, 458(1-2), 2001, pp. 534-543

Abstract

The application of CdTe and CdZnTe 2D-array detectors for medical X-ray Computed Tomography (XCT) is investigated. Different metallic electrodes havebeen deposited on High pressure Bridgman Method CdZnTe and on Traveling Heater Method CdTe:Cl. These detectors are exposed to X-rays in the CT irradiation conditions (E-max = 125 keV, (E) over bar = 70 keV, Phi (x) = 4 x 10(10) ph s(-1) cm(-2)) and are characterized experimentally in current mode. High dynamic range and fast current decrease after the X-ray beam cut-off are required for the application. Detectors performances such as sensitivityand response speed are then studied. The performances achieved are encouraging: dynamic ranges higher than four decades and current decreases of about three decades in 4ms after X-ray beam cut-off are obtained. Nevertheless,these detectors are still limited by a memory effect that makes them not yet suitable for XCT. Experimental results are explained by important chargetrapping and de-trapping due to the presence of high-level densities. The trapped carrier space charges may also influence the injection from the electrodes. Our conclusions are confirmed by experiments at low temperature and by laser time-of-flight measurements. The information we get on the predominant involved levels are correlated with traditional level studies in order to identify them (energy depths, origins) and to overcome the actual CdTe and CdZnTe detectors limitations for XCT. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 03/07/20 alle ore 01:11:47