公开(公告)号：US11367227B2

公开(公告)日：2022-06-21

申请号：US16941015

申请日：2020-07-28

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Karthikayan Balakrishnan ,  Kent C. Burr

IPC: G06T11/00 ,  G06T7/10 ,  G06T15/08 ,  G06T7/90

Abstract: A method of imaging includes obtaining projection data for an object representing an intensity of radiation detected along a plurality of rays through the object, obtaining an outline of the object via a secondary imaging system, the secondary imaging system using non-ionizing radiation, determining, based on the outline, a model and model parameters for the object, calculating, based on the model and the model parameters, a volumetric attenuation map for the object, and reconstructing, based on the projection data and the volumetric attenuation map, an attenuation-corrected volumetric image.

公开(公告)号：US20220036607A1

公开(公告)日：2022-02-03

申请号：US16941015

申请日：2020-07-28

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Karthikayan BALAKRISHNAN ,  Kent C. Burr

IPC: G06T11/00 ,  G06T7/10 ,  G06T7/90 ,  G06T15/08

Abstract: A method of imaging includes obtaining projection data for an object representing an intensity of radiation detected along a plurality of rays through the object, obtaining an outline of the object via a secondary imaging system, the secondary imaging system using non-ionizing radiation, determining, based on the outline, a model and model parameters for the object, calculating, based on the model and the model parameters, a volumetric attenuation map for the object, and reconstructing, based on the projection data and the volumetric attenuation map, an attenuation-corrected volumetric image.

公开(公告)号：US10782429B2

公开(公告)日：2020-09-22

申请号：US16269380

申请日：2019-02-06

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Yi Qiang ,  Xiaoli Li ,  Kent C. Burr

IPC: G01T7/00 ,  G01T1/29

Abstract: A method and apparatus are provided for positron emission imaging to calibrate energy measurements of a pixilated gamma-ray detector using energy sharing events between channels of the detector. Due to conservation of energy, when the energy of a single gamma ray shared among multiple channels, the sum of measured energies across the respective channel must equal the original energy of the incident gamma ray. Further, the fractions of the original energy distributed to the respective channels can span the entire range of zero to the original energy. Thus, a single gamma-ray source (e.g., cesium isotope 137) can be used to continuously calibrate the nonlinear energy response of the detector over an entire range of interest.