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Proceedings Paper

Nuclear Medicine Imaging With Pressurized Multiwire Proportional Chambers
Author(s): Leon Kaufman; L. Blumin; R. Cavalieri; V. Perez-Mendez; Gerald Stoker
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Paper Abstract

We have previously described the con-struction and operation of a xenon-filled multiwire proportional chamber (MWPC)(Ref.1, 2). This type of detector offers high resolution gamma-ray imaging over large areas, with good uniformity of response and at costs that are low when compared to that of scintillation cameras. The main drawback of MWPC's is their low detection efficiency. This parameter can be increased by constructing thicker detectors, but at a sacrifice in spatial resolution, which is degraded by the increased transverse path presented to photons accepted within the solid angle subtended by the collimators used for imaging. On the other hand, increasing the density of the gas raises detector efficiency by increasing its effective mass. Because the detection process in a MWPC involves transfer of energy from a gamma-ray to an electron, the path length of this conversion electron determines the intrinsic spatial resolution of the detector. Thus, an increase in gas density also has the favorable effect of reducing this path. We have found that operation in a pressurized mode (Ref. 3) offers the advantage of simultaneously increasing efficiency and spatial resolution.

Paper Details

Date Published: 1 May 1974
PDF: 6 pages
Proc. SPIE 0043, Application of Optical Instrumentation in Medicine II, (1 May 1974); doi: 10.1117/12.953884
Show Author Affiliations
Leon Kaufman, University of California (United States)
L. Blumin, Veterans Administration Hospital (United States)
R. Cavalieri, Veterans Administration Hospital (United States)
V. Perez-Mendez, Lawrence Berkeley Laboratory and University of California (United States)
Gerald Stoker, Lawrence Berkeley Laboratory (United States)

Published in SPIE Proceedings Vol. 0043:
Application of Optical Instrumentation in Medicine II
William R. Hendee; William C. Zarnstorff, Editor(s)

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