Simplified image reconstruction method in 4π Compton imaging for radioactive source identification

We proposed a simplified image reconstruction method in 4π Compton imaging to determine the intensity and location of point-like gamma-ray sources. The proposed method can be quickly done by fixing an apex of each Compton cone to a center of a Compton imaging detector and using a lookup table of cone projection profiles for all possible combinations. Using a prototype CdTe array detector with the proposed reconstruction method, 4π Compton images for a
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Cs gamma-ray point source far from the detector were obtained. Also, the identification of a
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Cs point source in a plastic box was successfully demonstrated.