US 11,925,498 B2
Reconstructing image
Rumei Zhang, Shanghai (CN); Long Yang, Shanghai (CN); Peng Gao, Shanghai (CN); Guodong Liang, Shanghai (CN); and Jun Zhang, Shanghai (CN)
Assigned to Shenyang Intelligent Neuclear Medical Technology Co., Ltd., Shenyang (CN)
Filed by SHENYANG INTELLIGENT NEUCLEAR MEDICAL TECHNOLOGY CO., LTD., Liaoning (CN)
Filed on Sep. 29, 2020, as Appl. No. 17/037,301.
Claims priority of application No. 201910945559.4 (CN), filed on Sep. 30, 2019.
Prior Publication US 2021/0093279 A1, Apr. 1, 2021
Int. Cl. A61B 6/00 (2006.01); A61B 6/03 (2006.01); G06T 11/00 (2006.01)
CPC A61B 6/5205 (2013.01) [A61B 6/037 (2013.01); A61B 6/4233 (2013.01); G06T 11/005 (2013.01); G06T 2210/41 (2013.01)] 16 Claims
OG exemplary drawing
 
1. A method of reconstructing an image, comprising:
identifying a plurality of first scan data sets and a second scan data set from Positron Emission Tomography (PET) scan data, wherein each of the first scan data sets corresponds to an intra-crystal Compton scattering event that has 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; and
reconstructing the 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 initial 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 the plurality of 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; and
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.