EGS5 simulations to design a Ce:GAGG scintillator based Compton camera

Ce⁺³: Gd₃Al₂Ga₃O₁₂ (Ce:GAGG) is expected to be promising scintillator for PET, SPECT, and gamma camera applications because of its attractive properties. We designed a Compton camera based on Ce:GAGG, both as scatterer and absorber, for imaging and radioactivity measurement of point sources. The two important parameters sensitivity and spatial resolution are determined for 4 × 4 pixels, each pixel of size 1 × 1cm², for both scatterer and absorber. Our main focus in this paper is to image a distant source for which sensitivity is of prime importance. High sensitivity and light weight are two important advantages of Compton camera for distant source imaging and the availability of Ce:GAGG 3 × 3mm² pixel size is expected to give a spatial resolution of ~5mm for medical applications as well.