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Monolithically Integrated X-Ray Detector Arrays for Computed Tomography

Published online by Cambridge University Press:  10 February 2011

R. Sudharsanan ,
M. Yoganathan ,
G. Vakerlis ,
C. S. Ferekides ,
B. McCandless ,
R. Birkmire ,
R. Deych  and
R. Luhta
R. Sudharsanan
Affiliation:
Spire Corporation, One Patriots Park, Bedford, MA 01730, Sudan@Spirecorp.com
M. Yoganathan
Affiliation:
Spire Corporation, One Patriots Park, Bedford, MA 01730, Sudan@Spirecorp.com
G. Vakerlis
Affiliation:
Spire Corporation, One Patriots Park, Bedford, MA 01730, Sudan@Spirecorp.com
C. S. Ferekides
Affiliation:
Department of Electrical Engineering, University of South Florida, Tampa, FL 33620
B. McCandless
Affiliation:
Institute for Energy Conversion, University of Delaware, Newark, DE 19716
R. Birkmire
Affiliation:
Institute for Energy Conversion, University of Delaware, Newark, DE 19716
R. Deych
Affiliation:
Analogic Corporation, Peabody, MA 01960
R. Luhta
Affiliation:
Picker International, Highland HTS., OH 44143
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Abstract

The design and performance of a high sensitivity monolithic X-ray detector array fabricated by depositing CdTe photodiodes on CdWO4 scintillators for computed tomography (CT) are presented. CdTe photodiodes offer improved sensitivity due to the better match to the CdWO4 scintillator emission spectrum than the Si photodiodes used in current CT scanners. A CdTe photodiode fabricated on glass mechanically stacked to a CdWO4 scintillator showed 30% improvement in signal strength over Si photodiodes stacked to CdWO4-. Monolithic X-ray detector arrays were fabricated by depositing a CdTe photodiode structure on CdWO4 using close-spaced sublimation technique. Preliminary results on the detector's X-ray response, signalto- noise ratio and the X-ray temporal response show that monolithic CdTe X-ray detectors are suitable for practical CT scanner applications.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 487: Symposium I – Semiconductors for Room-Temperature Radiation II , 1997 , 573
Copyright
Copyright © Materials Research Society 1998

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