公开(公告)号：US20240023911A1

公开(公告)日：2024-01-25

申请号：US17870346

申请日：2022-07-21

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Yi QIANG ,  Xiaoli LI ,  Wenyuan QI

IPC: A61B6/00 ,  G01T1/17

CPC classification number: A61B6/4241 ,  A61B6/583 ,  G01T1/171

Abstract: A method is provided for count loss correction based on detector dead time in a radiation diagnosis apparatus. The method includes acquiring scan data from a scan of a patient performed using the radiation diagnosis apparatus; determining, from the acquired scan data, a first count rate occurring in a first energy window spanning a first energy range; determining, from the acquired scan data, a second count rate occurring in a second window spanning a second energy range, the second energy range being different from the first energy range; calculating a particular count loss correction factor based on the determined first count rate and the determined second count rate; and reconstructing an image based on the acquired scan data and the calculated particular count loss correction factor.

公开(公告)号：US20220397688A1

公开(公告)日：2022-12-15

申请号：US17345823

申请日：2021-06-11

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Yi QIANG ,  Kent C. BURR ,  Peng PENG ,  Xiaoli LI

IPC: G01T1/29

Abstract: A circuit for receiving signals from a photodetector array arranged to detect signals generated by a crystal includes a plurality of summing circuits having weighting circuits, the summing circuits being configured to produce outputs corresponding to a total energy of the signals, a position of the signals in a first dimension of the photodetector array, a position of the signals in a second dimension of the photodetector array, and a radius of a charge distribution of the signals.

公开(公告)号：US20220252746A1

公开(公告)日：2022-08-11

申请号：US17168852

申请日：2021-02-05

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Kent C. BURR ,  Yi QIANG ,  Xiaoli LI

IPC: G01T7/00 ,  G01T1/29

Abstract: In a gamma-ray detector system, such as a PET detector, coincidence events between multiple detector elements can be caused by inter-detector scattering and/or energy escape of the multi-stage radiation background in the scintillator crystals. Because these types of coincidence events are more likely to happen between nearby elements, they can be measured, analyzed and ultimately used to identify arrangement errors of detector elements in a gamma-ray detector system.

公开(公告)号：US20210208293A1

公开(公告)日：2021-07-08

申请号：US16866993

申请日：2020-05-05

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Wenyuan QI ,  Yi QIANG ,  Evren ASMA ,  Xiaoli LI ,  Li YANG ,  Peng PENG ,  Jeffrey KOLTHAMMER

IPC: G01T1/29

Abstract: A method of normalizing detector elements in an imaging system is described herein. The method includes a line source that is easier to handle for a user, and decouples the normalization of the detector elements into a transaxial domain and an axial domain in order to isolate errors due to positioning of the line source. Additional simulations are performed to augment the real scanner normalization. A simulation of a simulated line source closely matching the real line source can be performed to isolate errors due to physical properties of the crystals and position of the crystals in the system, wherein the simulated detector crystals are otherwise modeled uniformly. A simulation of a simulated cylinder source can be performed to determine errors due to other effects stemming from gaps between the detector crystals.