公开(公告)号：US20240335178A1

公开(公告)日：2024-10-10

申请号：US18297112

申请日：2023-04-07

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Jeffrey KOLTHAMMER ,  Kent BURR ,  Yi QIANG

IPC: A61B6/00 ,  G16H40/40

CPC classification number: A61B6/586 ,  A61B6/582 ,  G16H40/40 ,  A61B6/037

Abstract: A method for detecting an anomaly related to a medical imaging device includes acquiring data from a plurality of detectors of the medical imaging device, applying the acquired data to a first autoencoder, and detecting, based on outputs from the first autoencoder, an anomaly related to the medical imaging device.

公开(公告)号：US20240233213A1

公开(公告)日：2024-07-11

申请号：US18151497

申请日：2023-01-09

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Yi QIANG ,  Xiaohui ZHAN ,  Wenyuan QI ,  Jeffrey KOLTHAMMER

IPC: G06T11/00

CPC classification number: G06T11/008 ,  G06T2207/10104 ,  G06T2207/20084

Abstract: A method is provided for generating an attenuation map for PET image reconstruction. The method includes training a deep convolutional neural network (DCNN) model by minimizing a loss function between initial input image data and the attenuation map generated by a spectral CT scan as supervised data. Further, the method includes obtaining PET data from a scan of a subject and reconstructing a PET image from the PET data and an attenuation map output from the DCNN. The initial input image data can be from a conventional CT scan with or without beam-hardening correction or the input image data can be from a phantom, a simulation, or a SPECT image.

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：US20240125951A1

公开(公告)日：2024-04-18

申请号：US17960689

申请日：2022-10-05

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Xiaoli LI ,  Yi QIANG ,  Jeffrey KOLTHAMMER ,  Masaki MIYAHARA

IPC: G01T1/29 ,  A61B6/03

CPC classification number: G01T1/2985 ,  A61B6/037 ,  G06T11/003

Abstract: A positron emission tomography (PET) scanner is provided having a plurality of detector subsystems, including processing circuitry to determine, for each detector subsystem of the plurality of detector subsystems, a singles count loss correction factor of the detector subsystem; determine, for each detector subsystem pair of a plurality of pairs of the detector subsystems, a coincidence count loss correction factor for the detector subsystem pair; calculate a scanner coincidence count loss correction factor for the PET scanner based on the coincidence count loss correction factors determined for the plurality of pairs of the detector subsystems; and reconstruct an image based on the calculated scanner count loss correction factor and scan data acquired from a scan of a patient performed using the PET scanner.

公开(公告)号：US20240122558A1

公开(公告)日：2024-04-18

申请号：US17963737

申请日：2022-10-11

Applicant: CANON MEDICAL SYSTEMS CORPORATION

Inventor： Wenyuan QI ,  Kent C. BURR ,  Yi QIANG ,  Evren ASMA ,  Jeffrey KOLTHAMMER

IPC: A61B6/03 ,  A61B6/00

CPC classification number: A61B6/037 ,  A61B6/4258 ,  A61B6/481

Abstract: A PET scanner includes gamma-ray detector rings that form a bore through which an imaging subject is translated, a length of the bore defining an axial length of the PET scanner, the gamma-ray detector rings being movable along the axial length, the gamma-ray detector rings including gamma-ray detector modules therein, and processing circuitry configured to receive PET data associated with a plurality of transaxial slices of the imaging subject, the PET data including a first set of spatial information and timing information corresponding to a first data acquisition period for the gamma-ray detector modules in a first axial position and a second set of spatial information and timing information corresponding to a second data acquisition period for the gamma-ray detector modules in a second axial position, and reconstruct a PET image based on the first set of spatial and timing information and the second set of spatial and timing information.