Medical positron imaging with a dense drift space multiwire proportional chamber

Journal Article · Thu Jul 01 04:00:00 EDT 1982 · IEEE Transactions on Medical Imaging; (United States)

DOI:https://doi.org/10.1109/TMI.1982.4307542· OSTI ID:5326078

Guerra, A D; Lim, C B; Lum, G K; Ortendahl, D; Perez-Mendez, V

A multiplanar positron camera is proposed, made of six MWPC modules, arranged to form the lateral surface of a hexagonal prism. Each 50 x 50 cm/sup 2/ module has a single MWPC sandwiched by two 2-cm thick lead glass tube converters. The experimental results for a 15 x 15 cm/sup 2/ test module are reported. For 511 keV ..gamma..-rays incident almost perpendicular onto a 1.0-cm thick converter, a detection efficiency of 4.3%, a time resolution of 130 ns (FWHM) and a spatial resolution of 2.8 mm (FWHM) have been measured with a standard Argon-Methane (70-30) mixture at 1.2 atm. The chamber may also be operated in high resolution mode: 1.2-mm (FWHM) spatial resolution has been measured at a 50% lower efficiency. The use of fast delay lines (specific delay = 8 ns/cm) for the position read-out ensures a high rate capability. The expected performance of the six-module MWPC camera is discussed and compared with that of a BGO crystal ring camera. The MWPC solution seems very attractive not only for its low cost and simplicity of construction, but also for its fully three-dimensional imaging capability.

• Research Organization: Lawrence Berkeley Lab., CA
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5326078
• Journal Information: IEEE Transactions on Medical Imaging; (United States), Journal Name: IEEE Transactions on Medical Imaging; (United States) Vol. MI-1:1
• Country of Publication: United States
• Language: English

Related Subjects

550602* -- Medicine-- External Radiation in Diagnostics-- (1980-)
62 RADIOLOGY AND NUCLEAR MEDICINE
CAMERAS
COST
EFFICIENCY
ELECTROMAGNETIC RADIATION
GAMMA CAMERAS
GAMMA RADIATION
IMAGE PROCESSING
IONIZING RADIATIONS
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
PERFORMANCE
POSITRON CAMERAS
PROCESSING
PROPORTIONAL COUNTERS
RADIATION DETECTORS
RADIATIONS
RESOLUTION
SPATIAL RESOLUTION
SPECIFICATIONS