The count rate performance of a multiwire gamma camera measured by a decaying source method with 9. 3-minute tantalum-178

Journal Article · Mon Oct 01 04:00:00 EDT 1990 · Journal of Nuclear Medicine; (USA)

OSTI ID:6148072

Adams, R; Lacy, J L; Ball, M E; Martin, L J ^[1]

---

1. Loma Linda Univ., CA (USA)

The multiwire gamma camera (MWGC) operates at high count rates with radionuclides of low energy and short half-life. We evaluate the count rate performance of the MWGC with tantalum-178 ({sup 178}Ta) by a decaying source method. Data acquired dynamically by the camera from a {sup 178}Ta source in the NEMA Standards scatter phantom were corrected for deadtime loss by a trial paralyzing deadtime and converted to their natural logarithms. The trial deadtime, tau, was adjusted iteratively after curve fittings until a straight line was achieved. The paralyzing deadtime determined by this method was 0.41 microsecond. Therefore, the camera can be operated up to 850,000 cps with {sup 178}Ta without exceeding 50% data loss. This rate is 10 times greater than the performance of the typical scintillation camera. Moreover, high count rates are achieved without significant loss of spatial resolution.

• OSTI ID: 6148072
• Journal Information: Journal of Nuclear Medicine; (USA), Journal Name: Journal of Nuclear Medicine; (USA) Vol. 31:10; ISSN 0161-5505; ISSN JNMEA
• 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
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CAMERAS
ELECTRON CAPTURE RADIOISOTOPES
GAMMA CAMERAS
HALF-LIFE
HOURS LIVING RADIOISOTOPES
INTERMEDIATE MASS NUCLEI
ISOTOPES
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
PERFORMANCE TESTING
RADIOISOTOPES
RESOLUTION
SPATIAL RESOLUTION
TANTALUM 178
TANTALUM ISOTOPES
TESTING