System and method for image reconstruction in positron emission tomography

A method for image reconstruction in a PET system, comprising:

• generating, by each detector unit of a plurality of detector units arranged along an axial direction, a plurality of single event counts;
• transmitting single event data generated by the each detector unit to one or more of a plurality of coincidence logic circuits, wherein each of the plurality of coincidence logic circuits is operably connected to one or more of the plurality of detector units;
• generating coincidence counts relating to the plurality of detector units synchronically with the rest of the plurality of coincidence logic circuits, wherein a single coincidence logic circuit of the plurality of coincidence logic circuits is configured to perform a coincidence count for two single events from the same detector unit, and perform a coincidence count for two single events that are from two different detector units respectively;
• and
• reconstructing an image by performing, based on the coincidence counts, forward projection calculation and backward projection calculation.

A non-transitory computer readable medium storing instructions, the instructions, when executed by at least one processor, causing the at least one processor to implement a method for image reconstruction in a positron emission tomography (PET) system comprising:

• generating, by each detector unit of a plurality of detector units arranged along an axial direction, a plurality of single event counts;
• transmitting single event data generated by the each detector unit to one or more of a plurality of coincidence logic circuits, wherein each of the plurality of coincidence logic circuits is operably connected to one or more of the plurality of detector units;
• for each of the plurality of coincidence logic circuits, generating, by the coincidence logic circuit, one or more coincidence counts relating to the one or more of the plurality of detector units synchronically with the rest of the plurality of coincidence logic circuits, wherein a single coincidence logic circuit of the plurality of coincidence logic circuits is configured to perform a coincidence count for two single events from the same detector unit and perform a coincidence count for two single events that are from two non-adjacent detector units respectively, and the two non-adjacent detector units refer to two of the plurality of detector units that are separated, along the axial direction, by at least one other detector unit of the plurality of detector units;
• and
• reconstructing an image by performing, based on the coincidence counts, forward projection calculation and backward projection calculation.