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Proceedings Paper

Advantages of semiconductor CZT for medical imaging
Author(s): Douglas J. Wagenaar; Kevin Parnham; Bjorn Sundal; Gunnar Maehlum; Samir Chowdhury; Dirk Meier; Thor Vandehei; Marek Szawlowski; Bradley E. Patt
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Paper Abstract

Cadmium zinc telluride (CdZnTe, or CZT) is a room-temperature semiconductor radiation detector that has been developed in recent years for a variety of applications. CZT has been investigated for many potential uses in medical imaging, especially in the field of single photon emission computed tomography (SPECT). CZT can also be used in positron emission tomography (PET) as well as photon-counting and integration-mode x-ray radiography and computed tomography (CT). The principal advantages of CZT are 1) direct conversion of x-ray or gamma-ray energy into electron-hole pairs; 2) energy resolution; 3) high spatial resolution and hence high space-bandwidth product; 4) room temperature operation, stable performance, high density, and small volume; 5) depth-of-interaction (DOI) available through signal processing. These advantages will be described in detail with examples from our own CZT systems. The ability to operate at room temperature, combined with DOI and very small pixels, make the use of multiple, stationary CZT "mini-gamma cameras" a realistic alternative to today's large Anger-type cameras that require motion to obtain tomographic sampling. The compatibility of CZT with Magnetic Resonance Imaging (MRI)-fields is demonstrated for a new type of multi-modality medical imaging, namely SPECT/MRI. For pre-clinical (i.e., laboratory animal) imaging, the advantages of CZT lie in spatial and energy resolution, small volume, automated quality control, and the potential for DOI for parallax removal in pinhole imaging. For clinical imaging, the imaging of radiographically dense breasts with CZT enables scatter rejection and hence improved contrast. Examples of clinical breast images with a dual-head CZT system are shown.

Paper Details

Date Published: 28 September 2007
PDF: 10 pages
Proc. SPIE 6707, Penetrating Radiation Systems and Applications VIII, 67070I (28 September 2007); doi: 10.1117/12.740329
Show Author Affiliations
Douglas J. Wagenaar, Gamma Medica-Ideas, Inc. (United States)
Kevin Parnham, Gamma Medica-Ideas, Inc. (United States)
Bjorn Sundal, Gamma Medica-Ideas, Inc. (United States)
Gunnar Maehlum, Gamma Medica-Ideas, Inc. (United States)
Samir Chowdhury, Gamma Medica-Ideas, Inc. (United States)
Dirk Meier, Gamma Medica-Ideas, Inc. (United States)
Thor Vandehei, Gamma Medica-Ideas, Inc. (United States)
Marek Szawlowski, Gamma Medica-Ideas, Inc. (United States)
Bradley E. Patt, Gamma Medica-Ideas, Inc. (United States)

Published in SPIE Proceedings Vol. 6707:
Penetrating Radiation Systems and Applications VIII
F. Patrick Doty; H. Bradford Barber; Hans Roehrig, Editor(s)

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