PET detector of composite crystal array and construction method thereof

The invention discloses a PET detector of a composite crystal array and a construction method thereof. The PET detector comprises a scintillation crystal module, a photoelectric conversion device module and a detector electronics module. The scintillation crystal module is used for converting gamma photons into visible light and soft ultraviolet photons and transmitting the visible light and softultraviolet photons to the photoelectric conversion device module; and the scintillation crystal module is an AB type mixed light and heavy rare earth single crystal array composed of a crystal moduleA and a crystal module B; wherein the crystal module A is a light rare earth single crystal and the crystal module B is a heavy rare earth single crystal; and A and B form a crystal array using a structure of a partition structure. The scintillation crystal array in the PET detector is composed of two mixed light and heavy rare earth crystals A and B; on the premise that the high performance of the PET detector is guarant