GEANT4 simulation and image reconstruction with optimization for array type Compton camera

For various applications and security considerations of radioactive nuclide, good performance of Compton camera is very important. In this article, the Monte Carlo method is used to simulate the double array type Compton camera, whose scattering detector material is Si and absorption detector material is CZT. By using the projection image reconstruction algorithm for image reconstruction, the maximum likelihood method is adopted to optimize reconstruction results, which effectively improves the resolution of the reconstructed image. When the source-detector distance is 100 mm, after 10 times of maximum likelihood method iterative calculation, the position resolution and angle resolution are 5.1 mm and 7.3 respectively. It is proved that maximum likelihood method can optimize Compton camera source image reconstruction effectively.