Development of a pixelated GSO gamma camera system with tungsten parallel hole collimator for single photon imaging
- Kobe City College of Technology, 8-3 Gakuen-Higashi-machi, Nishi-ku, Kobe 651-2194 (Japan)
Purpose: In small animal imaging using a single photon emitting radionuclide, a high resolution gamma camera is required. Recently, position sensitive photomultiplier tubes (PSPMTs) with high quantum efficiency have been developed. By combining these with nonhygroscopic scintillators with a relatively low light output, a high resolution gamma camera can become useful for low energy gamma photons. Therefore, the authors developed a gamma camera by combining a pixelated Ce-doped Gd{sub 2}SiO{sub 5} (GSO) block with a high quantum efficiency PSPMT. Methods: GSO was selected for the scintillator, because it is not hygroscopic and does not contain any natural radioactivity. An array of 1.9 mm x 1.9 mm x 7 mm individual GSO crystal elements was constructed. These GSOs were combined with a 0.1-mm thick reflector to form a 22 x 22 matrix and optically coupled to a high quantum efficiency PSPMT (H8500C-100 MOD8). The GSO gamma camera was encased in a tungsten gamma-ray shield with tungsten pixelated parallel hole collimator, and the basic performance was measured for Co-57 gamma photons (122 keV). Results: In a two-dimensional position histogram, all pixels were clearly resolved. The energy resolution was {approx}15% FWHM. With the 20-mm thick tungsten pixelated collimator, the spatial resolution was 4.4-mm FWHM 40 mm from the collimator surface, and the sensitivity was {approx}0.05%. Phantom and small animal images were successfully obtained with our developed gamma camera. Conclusions: These results confirmed that the developed pixelated GSO gamma camera has potential as an effective instrument for low energy gamma photon imaging.
- OSTI ID:
- 22098751
- Journal Information:
- Medical Physics, Journal Name: Medical Physics Journal Issue: 2 Vol. 39; ISSN 0094-2405; ISSN MPHYA6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
62 RADIOLOGY AND NUCLEAR MEDICINE
CERIUM ADDITIONS
COBALT 57
COLLIMATORS
DOPED MATERIALS
ENERGY RESOLUTION
EQUIPMENT
GADOLINIUM COMPOUNDS
GAMMA CAMERAS
GAMMA RADIATION
KEV RANGE 100-1000
NATURAL RADIOACTIVITY
PHANTOMS
PHOSPHORS
PHOTOMULTIPLIERS
QUANTUM EFFICIENCY
SPATIAL RESOLUTION
TWO-DIMENSIONAL CALCULATIONS