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Proceedings Paper

CdZnTe arrays for nuclear medicine imaging
Author(s): H. Bradford Barber
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Paper Abstract

In nuclear medicine, a gamma-ray-emitting radiotracer is injected into the body, and the resulting biodistribution is imaged using a gamma camera. Current gamma cameras use a design developed by Anger '. An Anger camera makes use of a slab of scintillation detector that is viewed by an array of photomultiplier tubes and uses an analog position estimation technique to determine the position ofthe gamma ray's interaction. The image-forming optics is usually a multi-bore collimator made of lead. Such cameras are characterized by poor, system spatial resolution (-1 cm) due to poor detector resolution (-0.4 cm) and poor collimator performance. The energy resolution ofcurrent gamma cameras is also limited (-11% FWHM @ 140 keV). Energy resolution is useful for suppressing the effects ofCompton scattering in tissue. In single photon emission computed tomography (SPECT), a number of images are taken ofthe patient from different viewing directions and these images are used to reconstruct a representation ofthe three-dimensional source distribution. Another technique, positron emission tomography (PET), images the annihilation radiation from a positron emitter, but it is more costly than SPECT and less widely available.

Paper Details

Date Published: 19 July 1996
PDF: 3 pages
Proc. SPIE 2859, Hard X-Ray/Gamma-Ray and Neutron Optics, Sensors, and Applications, (19 July 1996); doi: 10.1117/12.245149
Show Author Affiliations
H. Bradford Barber, Health Sciences Ctr./Univ. of Arizona (United States)

Published in SPIE Proceedings Vol. 2859:
Hard X-Ray/Gamma-Ray and Neutron Optics, Sensors, and Applications
Richard B. Hoover; F. Patrick Doty, Editor(s)

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