High-spatial-resolution MWPC for medical imaging with positron emitters

Conference · Mon Mar 01 04:00:00 EST 1982

OSTI ID:5430820

Del Guerra, A; Perez-Mendez, V; Schwartz, G; Sleaford, B

The performance of a 15 x 15 cm/sup 2/ MultiWire Proportional Chamber (MWPC) with lead glass tube converter is presented. A standard Argon-Methane (70-30) gas mixture has been used at various pressures between 1.0 and 2.0 atm. For 511 keV ..gamma..-rays incident almost perpendicular onto a 1.0 cm thick lead glass tube converter, a detection efficiency of 4.5%, a time resolution of 130 ns (FWHM) and a spatial resolution of 1.3 mm (FWHM) has been obtained at 2 atm. Fast delay lines, capacitively coupled to the cathodes, standard integrated amplifiers and comparator electronics have been adopted for the position read-out. The use of fast delay lines (specific delay 8 ns/cm) ensures a high rate capability. A multiplanar positron camera is proposed, made of six MWPC modules arranged to form the lateral surface of a hexagonal prism. Each module (50 x 50 cm/sup 2/) will have a 2 cm thick converter on both sides of the chamber and will be operating at 2 atm. The expected performance is presented and compared with that of a recent multi-ring BGO camera, and is shown to be superior in spatial resolution and comparable in event rate at a considerably lower cost.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 5430820
• Report Number(s): LBL-14044; CONF-820354-2; ON: DE82014477
• Country of Publication: United States
• Language: English

Related Subjects

440101* -- Radiation Instrumentation-- General Detectors or Monitors & Radiometric Instruments
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY
550601 -- Medicine-- Unsealed Radionuclides in Diagnostics
62 RADIOLOGY AND NUCLEAR MEDICINE
CAMERAS
DESIGN
EFFICIENCY
GAMMA CAMERAS
MEASURING INSTRUMENTS
MULTIWIRE PROPORTIONAL CHAMBERS
PERFORMANCE
POSITRON CAMERAS
PROPORTIONAL COUNTERS
RADIATION DETECTORS
RESOLUTION
SPATIAL RESOLUTION