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1. A gamma ray detection system comprising a detection module assembly including at least two detection modules configured for positron emission tomography (PET) scanning of a target zone, each detection module comprising a plurality of stacked monolithic scintillator plates each having a major surface oriented to generally face the target zone and lateral minor surfaces defining edges of the scintillator plates, the major surface having a greater surface area than the surface area of the lateral minor surfaces, and a plurality of photon sensors being mounted against each of said edges configured to detect and determine the position within the plane of the major surface of scintillation events in the scintillator plates from gamma rays incident on the major surfaces, wherein the gamma ray detection system is further configured to function as a Compton camera, at least one scintillator plate that is not the scintillator plate closest to the target zone being configured as an absorber scintillator plate for said Compton camera, wherein photon sensors coupled to at least two radially stacked scintillator plates are connected to processing circuitry configured to apply Compton kinematic rules to determine whether two coincident block events corresponds to a forward or backward-scattered Compton scattering followed by absorption, wherein the processing circuitry is configured to utilize the interaction coordinates of the photoelectric absorption as LOR-end point for a forward-Compton scattered gamma ray originating from electron-positron annihilation with a Compton scattering-induced energy deposition below a threshold.
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