Performance stability of SHR-2000 high resolution PET for animal research.
The performance of a high resolution positron emission tomography (PET) system SHR-2000 for animal studies was re-evaluated six years after its installation. The system employs a detector array consisting of BGO crystals that are 1.7 mm (transaxially) by 10 mm (axially) by 30 mm (deep). A block detector, which is a position-sensitive photomultiplier tube (PMT) coupled to 4 arrays of BGO crystals has been adopted to the system. There are 15 block detectors positioned to form a 35 cm diameter ring with a field of view (FOV) of 17 cm by 4.6 cm axially, giving the system a 7 slice imaging capability. For six year workload in spatial resolution (FWHM), there were approximately a 2.6% increase at tangential FOV and a 7.5% increase at radial FOV. In axial resolution (FWHM) there was almost no change. The count rate loss for the true count rate increased 1.3% at 200 kBq/ ml. The average slice sensitivity showed a decrease of approximately 4.1%, and in scatters it showed an increase of approximately 1.4%. In animal experiments, the bones of guinea pigs were clearly identified with 18F fluoride ion. These experiments show that after a six year workload, the system also maintains good performance and has good stability.
Zhang
H
H
Department of Nuclear Medicine, Gunma University School of Medicine, Maebashi, Japan.
Alyafei
S
S
Inoue
T
T
Tomiyoshi
K
K
Endo
K
K
D000818:Animals; D005462:Fluorine Radioisotopes; D015902:Gamma Cameras; D006168:Guinea Pigs; D012588:Scintillation Counting; D012680:Sensitivity and Specificity; D014055:Tomography, Emission-Computed / Q000295:instrumentation* / Q000662:veterinary
D005462:Fluorine Radioisotopes