公开(公告)号：US20220330907A1

公开(公告)日：2022-10-20

申请号：US17230499

申请日：2021-04-14

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Liang CAl ,  Wenyuan QI ,  Xiaochun LAl ,  Peng PENG

IPC: A61B6/00 ,  G01T1/172 ,  G01T1/24

Abstract: Multiple interactions, such as Compton scattering, inside a PET detector are used to predict an incident photon's direction for identifying true coincidence events versus scatter/random coincidence events by creating a cone shaped shell projection defining a range of possible flight directions for the incident photon. The disclosed techniques can be used as prior information to improve the image reconstruction process. The disclosed techniques can be implemented in a LYSO/SiPM-based layer stacked detector, which can precisely register multiple interactions' 3D position.

公开(公告)号：US20240257361A1

公开(公告)日：2024-08-01

申请号：US18424310

申请日：2024-01-26

Applicant: iTOMOGRAPHY CORPORATION ,  THE UNIVERSITY OF CENTRAL FLORIDA RESEARCH FOUNDATION, Inc. ,  CANON MEDICAL SYSTEMS CORPORATION

Inventor： Seongjin YOON ,  Alexander KATSEVICH ,  Michael FRENKEL ,  Qiulin TANG ,  Liang CAl ,  Jian ZHOU ,  Zhou YU

IPC: G06T7/246 ,  G06T7/62 ,  G06T11/00

CPC classification number: G06T7/248 ,  G06T7/62 ,  G06T11/008 ,  G06T2207/10081 ,  G06T2207/20021 ,  G06T2207/30048 ,  G06T2207/30101 ,  G06T2210/41

Abstract: A method for motion estimation in CT systems is provided. The method includes dividing projection data, obtained by scanning a heart using the CT system, into a plurality of partial-angle-reconstruction (PAR) bins, reconstructing a plurality of PAR volumes from the PAR-binned projection data, obtaining, based on the plurality of reconstructed PAR volumes, a number of short-scan volumes, determining, based on the obtained number of short-scan volumes, a plurality of nodes throughout the heart, estimating, for each of the determined plurality of nodes, a plurality of model parameters of a motion model, and generating, based on the plurality of model parameters estimated for each of the plurality of nodes, parameters of a global motion model at each voxel of a volume of the heart. The method also includes reconstructing, based on the generated motion parameters of the global motion model at each voxel of the volume of the heart, a motion-compensated short-scan volume.