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.

公开(公告)号：US20240233211A1

公开(公告)日：2024-07-11

申请号：US18336741

申请日：2023-06-16

Applicant: THE REGENTS OF THE UNIVERSITY OF CALIFORNIA ,  CANON MEDICAL SYSTEMS CORPORATION

Inventor： Wenyuan QI ,  Li YANG ,  Jeffrey KOLTHAMMER ,  Evren ASMA ,  Jinyi QI ,  Tiantian LI

IPC: G06T11/00 ,  A61B6/00 ,  A61B6/03 ,  G06T7/20

CPC classification number: G06T11/005 ,  A61B6/037 ,  A61B6/5288 ,  G06T7/20 ,  G06T2207/10104

Abstract: A method for signal separation includes obtaining list mode data representing radiation detected during an imaging scan, the list mode data being affected by quasi-periodic motion of an imaging object; dividing the list mode data into first non-overlapping frames of a first frame length, and process the first frames to determine a cardiac cycle length; determining a second frame length, longer than the first frame length, based on the determined cardiac cycle length; re-binning the list mode data into overlapping frames having the second frame length, based on the non-overlapping frames having the first frame length; applying a principal component analysis (PCA) process on the re-binned list mode data having the second frame length to determine a respiratory waveform; determining a cardiac waveform using the determined respiratory waveform; and reconstructing an image based on the list mode data using the determined respiratory waveform and the determined cardiac waveform.

公开(公告)号：US20220343566A1

公开(公告)日：2022-10-27

申请号：US17237975

申请日：2021-04-22

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Peng PENG ,  Yi QIANG ,  Wenyuan QI ,  Xiaoli LI ,  Li YANG

IPC: G06T11/00 ,  G06T7/00

Abstract: An apparatus for reconstructing a positron emission tomography (PET) image, comprising processing circuitry configured to extract, from raw data obtained from a PET scanner, energy data and timing data associated with a plurality of annihilation events, the extracted energy data and the extracted timing data for each annihilation event corresponding to interactions between each of a pair of gamma rays generated by each annihilation event and one or more gamma ray detectors of the PET scanner, classify each annihilation event based on respective extracted energy data and respective extracted timing data, determine, for each annihilation event and based on a calculated timing resolution of the annihilation event, a width of a time-of-flight kernel, and reconstruct, by processing circuitry, the PET image based on the obtained raw data from the PET scanner and the determined width of the time-of-flight kernel associated with each annihilation event.