-
公开(公告)号：US20240050058A1
公开(公告)日：2024-02-15
申请号：US17886716
申请日：2022-08-12
Applicant: CANON MEDICAL SYSTEMS CORPORATION
Inventor： Xiaoli LI , Yi QIANG , Wenyuan QI
CPC classification number: A61B6/5282 , A61B6/037 , G06T11/005 , G06T2211/424
Abstract: A method is provided for determining a scatter fraction for a radiation diagnosis apparatus. The method includes acquiring an energy spectrum from list mode data obtained from a scan performed using the radiation diagnosis apparatus; determining, from the acquired list mode data, a first number of events occurring in a first energy window spanning a first energy range; determining, from the acquired list mode data, a second number of events occurring in a second window, the second energy window spanning a second energy range different from the first energy range; calculating a singles scatter fraction based on the determined first number of events and the determined second number of events; and reconstructing an image based on the acquired list mode data and the calculated singles scatter fraction.
-
公开(公告)号：US20230351646A1
公开(公告)日：2023-11-02
申请号：US17965289
申请日：2022-10-13
Inventor： Jinyi QI , Tiantian LI , Zhaoheng XIE , Wenyuan QI , Li YANG , Chung CHAN , Evren ASMA
CPC classification number: G06T11/005 , G06V10/44 , G06V10/7635 , G06V10/82 , G06V20/49 , G06T7/20 , G06T2207/10104 , G06T2207/20081
Abstract: A method, apparatus, and computer instructions stored on a computer-readable medium perform latent image feature extraction by performing the functions of receiving image data acquired during an imaging of a patient, wherein the image data includes motion by the patient during the imaging; segmenting the image data to include M image data segments corresponding to at least N motion phases having shorter durations than a duration of the motion by the patient during the imaging, wherein M is a positive integer greater than or equal to a positive integer N; producing, from the M image data segments, at least N latent feature vectors corresponding to the motion by the patient during the imaging; and performing a gated reconstruction of the N motion phases by reconstructing the image data based on the at least N latent feature vectors.
-
公开(公告)号：US20230206516A1
公开(公告)日：2023-06-29
申请号：US17682738
申请日：2022-02-28
Inventor： Jinyi QI , Tiantian LI , Zhaoheng XIE , Wenyuan QI , Li YANG , Chung CHAN , Evren ASMA
CPC classification number: G06T11/005 , G06T3/40 , G06T7/0014 , A61B6/5282 , A61B6/027 , A61B6/032 , A61B6/037 , G06T2207/20081 , G06T2207/20084 , G06T2207/10104 , G06T2207/10081 , G06T2207/30004 , G06T2210/41 , G06T2211/40
Abstract: A method, system, and computer readable medium to perform nuclear medicine scatter correction estimation, sinogram estimation and image reconstruction from emission and attenuation correction data using deep convolutional neural networks. In one embodiment, a Deep Convolutional Neural network (DCNN) is used, although multiple neural networks can be used (e.g., for angle-specific processing). In one embodiment, a scatter sinogram is directly estimated using a DCNN from emission and attenuation correction data. In another embodiment a DCNN is used to estimate a scatter-corrected image and then the scatter sinogram is computed by a forward projection.
-
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
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：US20210335023A1
公开(公告)日：2021-10-28
申请号：US16860425
申请日：2020-04-28
Applicant: CANON MEDICAL SYSTEMS CORPORATION
Inventor： Wenyuan QI , Yujie LU , Evren ASMA , Yi QIANG , Jeffrey KOLTHAMMER , Zhou YU
Abstract: The present disclosure relates to an apparatus for estimating scatter in positron emission tomography, comprising processing circuitry configured to acquire an emission map and an attenuation map, each representing an initial image reconstruction of a positron emission tomography scan, calculate, using a radiative transfer equation (RTE) method, a scatter source map of a subject of the positron emission tomography scan based on the emission map and the attenuation map, estimate, using the RTE method and based on the emission map, the attenuation map, and the scatter source map, scatter, and perform an iterative image reconstruction of the positron emission tomography scan based on the estimated scatter and raw data from the positron emission tomography scan of the subject.
-
Patent Agency Ranking
公开(公告)号：US20210335022A1
公开(公告)日：2021-10-28
申请号：US16857916
申请日：2020-04-24
Applicant: CANON MEDICAL SYSTEMS CORPORATION
Inventor： Li YANG , Wenyuan QI , Evren ASMA
IPC: G06T11/00
Abstract: A method of imaging includes obtaining a plurality of dynamic sinograms, each dynamic sinogram representing detection events of gamma rays at a plurality of detector elements, summing the plurality of dynamic sinograms to generate an activity map based on a radioactivity level of the gamma rays; reconstructing, using the plurality of dynamic sinograms, a plurality of dynamic images, each of the plurality of dynamic images corresponding to one of the each of the plurality of dynamic sinograms, and generating, using the plurality of dynamic sinograms and the activity map, at least one parametric image.
-
17.发明申请公开(公告)号：US20210304457A1
公开(公告)日：2021-09-30
申请号：US17180182
申请日：2021-02-19
Inventor： Jinyi QI , Tiantian LI , Zhaoheng XIE , Wenyuan QI , Li YANG , Chung CHAN , Evren ASMA
Abstract: To reduce the effect(s) caused by patient breathing and movement during PET data acquisition, an unsupervised non-rigid image registration framework using deep learning is used to produce motion vectors for motion correction. In one embodiment, a differentiable spatial transformer layer is used to warp the moving image to the fixed image and use a stacked structure for deformation field refinement. Estimated deformation fields can be incorporated into an iterative image reconstruction process to perform motion compensated PET image reconstruction. The described method and system, using simulation and clinical data, provide reduced error compared to at least one iterative image registration process.
-
公开(公告)号：US20240037814A1
公开(公告)日：2024-02-01
申请号：US17878413
申请日：2022-08-01
Applicant: CANON MEDICAL SYSTEMS CORPORATION
Inventor： Chung CHAN , Li YANG , Xiaoli LI , Wenyuan QI , Evren ASMA , Jeffrey KOLTHAMMER
IPC: G06T11/00
CPC classification number: G06T11/005 , G06T2211/412
Abstract: A dynamic frame reconstruction apparatus and method for medical image processing is disclosed which reduces the computationally expensive reconstruction of images but which retains the accuracy of the image reconstruction. A convolutional neural network is used to cluster the dynamic data into groups of frames, each group sharing similar radiotracer distribution. In one embodiment, groups of frames that have similar reconstruction parameters are determined, and scatter and random estimations are computed once and shared among each of the frames in the same frame group.
-
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
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：US20230342914A1
公开(公告)日：2023-10-26
申请号：US17726070
申请日：2022-04-21
Applicant: CANON MEDICAL SYSTEMS CORPORATION
Inventor： Karthikayan BALAKRISHNAN , Kent C. BURR , Manabu TESHIGAWARA , Jeffrey KOLTHAMMER , Wenyuan QI
CPC classification number: G06T7/0012 , G06T7/20 , G06T11/008 , G06T2207/10104 , G06T2207/20084 , G06T2207/10048
Abstract: A method of generating an image, including: receiving, via a monitoring device, time-dependent data corresponding to a patient parameter; obtaining emission data representing radiation detected during a medical imaging scan; identifying time frames during the medical imaging scan to exclude from the obtained emission data, the identified time frames corresponding to a stressed emotional state for the patient based on the patient parameter; modifying the obtained emission data to exclude the emission data corresponding to the time frames corresponding to the stressed emotional state; and generating an emotional-state-corrected image based on the modified emission data excluding the emission data corresponding to the time frames corresponding to the stressed emotional state.
-
-
-
-
-
-
-
-
-
Search Results
23
records
(took 0.022 seconds)
