| CPC A61B 6/037 (2013.01) [A61B 6/4208 (2013.01)] | 16 Claims |
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1. A PET apparatus comprising:
processing circuitry configured to:
acquire list mode data;
reconstruct a PET image based on the list mode data;
identify first coincidence data that is obtained by coincidence counting by a first detector and a second detector that is different from the first detector from among a plurality of pieces of coincidence data included in the list mode data; and
estimate a time lag amount indicating a difference between a reaction time of the first detector to an incident gamma ray and a reaction time of the second detector to an incident gamma ray based on TOF information included in the first coincidence data and the PET image,
wherein the processing circuitry is further configured to:
generate a TOF drawn image in which a pair annihilation point position is estimated based on the TOF information,
calculate a first center-of-gravity position that indicates a center of gravity of the image information in the entire TOF drawn image and a second center-of-gravity position that indicates a position of the center of gravity of image information on the entire PET image, and
estimate the time lag amount using a position lag amount between the first center-of-gravity position and the second center-of-gravity position and a positional relationship between the first detector and the second detector.
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