Patent ID: 11925498
Assignee: SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECHNOLOGY CO., LTD.
Field: Medical technology (Instruments)
Classification: CPC A  G | IPC A  G

Claim 5:
6. A console device, comprising:
an external interface connecting a detector of a Positron Emission Tomography (PET) system, wherein the detector includes a plurality of crystals and a corresponding plurality of photoelectric converters and a processing circuit;
one or more memories storing machine-readable instructions; and
at least one processor configured to read the machine-readable instructions on the one or more memories to perform operations comprising:
identifying a plurality of first scan data sets and a second scan data set from PET scan data, wherein each of the first scan data sets corresponds to an intra-crystal Compton scattering event occurred in a plurality of crystals of a detector and includes two or more first single photon annihilation event data groups, and each of the first single photon annihilation event data groups comprises an energy value less than a preset first energy threshold, and the second scan data set comprises one or more second single photon annihilation event data groups and each of the second single photon annihilation event data groups comprises an energy value exceed a preset second energy threshold, the preset second energy threshold being greater than the first preset energy threshold;
for each of the plurality of first scan data sets: searching the second scan data set for a target second single photon annihilation event data group which matches with the first scan data set, and obtaining first coincidence event data from each of the first single photon annihilation event data groups in the first scan data set and the target second single photon annihilation event data group as coincidence event data recovered from an intra-crystal Compton scattering event corresponding to the first scan data set; reconstructing an image with the first coincidence event data and second coincidence event data which involves coincidence events corresponding to the second scan data set;
wherein the obtaining the first coincidence event data from each of the first single photon annihilation event data groups in the first scan data set and the target second single photon annihilation event data group comprises:
obtaining an initial reconstructed image by reconstructing an image according to scan data in the PET scan data which involves coincidence events;
performing, for each of the first single photon annihilation event data groups in the first scan data set, a coincidence processing on the first single photon annihilation event data group and the target second single photon annihilation event data group, to obtain a plurality of Lines of Response (LORs);
determining, for each of plurality of the LORs, a Time of Flight (TOF) kernel function to obtain a plurality of TOF kernel functions; performing, for each of the plurality of TOF kernel functions, line integration with the TOF kernel function and pixel values in the initial reconstructed image to obtain a probability value of a corresponding LOR for the TOF kernel function;
determining data comprising a first single photon annihilation event data group corresponding to a LOR of the plurality of LORs with a largest obtained probability value and the target second single photon annihilation event data group as the first coincidence event data;
and an internal bus connecting the external interface, the at least one processor and the one or more memories.