公开(公告)号：US12159330B2

公开(公告)日：2024-12-03

申请号：US17674063

申请日：2022-02-17

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Wenyuan Qi ,  Qiang Yi ,  Evren Asma ,  Li Yang ,  Peng Peng

IPC: G06T11/00 ,  A61B6/00 ,  A61B6/03 ,  G01T1/29

Abstract: Upon receiving list-mode data by detecting radiation emitted from a radiation source positioned with a field of view of a medical imaging scanner, each photon included in the list-mode data can be classified according to one or more interaction properties, such as energy or number of crystals interacted with. Grouped pairs of photons can be generated based on the classifying, and a corresponding interaction-property-specific correction kernel (e.g., a corresponding interaction-property-specific point spread function correction kernel) can be selected for each group. Corresponding interaction-property-specific correction kernels can then be utilized to generate higher quality images.

公开(公告)号：US11779296B2

公开(公告)日：2023-10-10

申请号：US16825857

申请日：2020-03-20

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Zhan Xiaohui ,  Qiang Yi ,  Zhihong Ye

IPC: A61B6/03 ,  A61B6/00 ,  G21K1/02

CPC classification number: A61B6/5282 ,  A61B6/032 ,  A61B6/40 ,  A61B6/4021 ,  A61B6/42 ,  A61B6/4208 ,  A61B6/4233 ,  A61B6/4241 ,  A61B6/4266 ,  A61B6/4275 ,  A61B6/4291 ,  A61B6/4435 ,  A61B6/482 ,  A61B6/483 ,  A61B6/5258 ,  A61B6/582 ,  G21K1/02 ,  G21K1/025

Abstract: An apparatus and a method for correcting for signal variations in pixels of a main photoelectric conversion element in a radiation detection apparatus due to focal spot position drifts. Edge reference detectors are positioned next to a main detector, in a fan beam coverage but outside a scan field of view. The signal variations of the edge reference detectors under an anti-scatter-grid shadow are used to estimate a real-time focal spot movement, which is used to estimate a shadow/signal variation on the main detector that are in the scan field of view.