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

Conference · Mon Mar 01 00:00:00 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; TRN: 82-013827
• Resource Relation: Conference: Conference on applications of physics to medicine and biology, Trieste, Italy, 30 Mar 1982; Other Information: Portions of document are illegible
• Country of Publication: United States
• Language: English

Related Subjects

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