Nuclear Medicine Imaging With Pressurized Multiwire Proportional Chambers

Leon Kaufman; L. Blumin; R. Cavalieri; V. Perez-Mendez; Gerald Stoker

doi:10.1117/12.953884

1 May 1974 Nuclear Medicine Imaging With Pressurized Multiwire Proportional Chambers

Leon Kaufman, L. Blumin, R. Cavalieri, V. Perez-Mendez, Gerald Stoker

Proceedings Volume 0043, Application of Optical Instrumentation in Medicine II; (1974) https://doi.org/10.1117/12.953884
Event: Application of optical Instrumentation in Medicine II, 1973, Chicago, United States

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.

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Leon Kaufman, L. Blumin, R. Cavalieri, V. Perez-Mendez, and Gerald Stoker "Nuclear Medicine Imaging With Pressurized Multiwire Proportional Chambers", Proc. SPIE 0043, Application of Optical Instrumentation in Medicine II, (1 May 1974); https://doi.org/10.1117/12.953884

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KEYWORDS

Sensors

Spatial resolution

Modulation transfer functions

Photons

CRTs

Collimators

Signal processing

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