Optimization Technique for a Prompt Gamma-raySPECT Collimator System

概要

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Because background radiation in an irradiation room creates a problem with the PG-SPECT (Prompt Gamma-ray Single Photon Emission Computed Tomography) system, which evaluates the absorbed dose for the Boron Neutron Capture Therapy treatment, optimization of a collimator system was performed while taking the shielding of background gamma-rays into consideration. Assuming that a parallel-beam collimator is used, three parameters ・the diameter of a hole, the length of the collimator, and the number of detectors (the number of holes of the collimator) ・were selected for optimization. Because the combinations of these parameters are limitless, it is difficult to determine them simultaneously. Therefore, a statistically derived Optimization Criterion has been proposed to optimize these parameters. When the spatial resolution was 1 cm-FWHM (full width at half maximum), the optimal diameter of the collimator was 5. 4 mm, the optimal length was 321 mm, and the optimal number of detectors was 31 × 31.
日本放射線影響学会の論文