Monte Carlo simulations of a small-animal PET scanner
نویسنده
چکیده
The work here presented analyzes the performances (in terms of scatter fraction, spatial resolution, sensitivity, image quality) obtained from a 10detectors small-animal PET, simulated via Geant4 Application for Emission Tomography (GATE), in comparison with other designs studied in previous works. Particular attention is given to the comparison with the 12-detectors miniPET II, already built and working, with the ultimate goal to understand if the removal of two detectors would substantially affect performances. Results obtained show a clear improvement in count rate and scatter fraction (-4% with respect to miniPET II and peak NECR of 114 kcps at 60 MBq with mouse phantom), as well as in sensitivity (maximum value obtained at the center of the camera with 10.91 cps/kBq); spatial resolution is as good as 1.58 mm FWHM in the transaxial plane, only 10% higher than miniPET II, and is confirmed by image quality tests on a mini Derenzo phantom. Results are encouraging and speak in favour of 10-detectors design.
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