公开(公告)号：US20220373629A1

公开(公告)日：2022-11-24

申请号：US17731412

申请日：2022-04-28

申请人： FUJIFILM Healthcare Corporation

发明人： Shinji Kurokawa ,  Yasuhiro Kamada ,  Toru Shirai ,  Takenori Murase ,  Hiroki Shoji

IPC分类号： G01R33/56

摘要： During obtaining a sensitivity distribution in a k-space, data based on which the sensitivity distribution is obtained is expanded with a mirror image to create an expanded image to prevent spectrum leakage, and the sensitivity distribution is stably calculated. During obtaining the sensitivity distribution in the k-space, image data based on which the sensitivity distribution is obtained is inverted as a mirror image to be made into the expanded image, the expanded image is transformed into k-space data, and a frequency component (frequency space data) of the sensitivity distribution is calculated. A region corresponding to the original image data is clipped from the calculated frequency space data, and the sensitivity distribution is obtained.

公开(公告)号：US20220128639A1

公开(公告)日：2022-04-28

申请号：US17501099

申请日：2021-10-14

申请人： FUJIFILM Healthcare Corporation

发明人： Shinji Kurokawa

IPC分类号： G01R33/565 ,  G06T7/11 ,  G06T11/00 ,  G01R33/56

摘要： A problem of time elongation in image reconstruction due to necessity of many iterations is solved, when an image is reconstructed by performing iterative approximation on measurement data acquired by an MRI apparatus without full-sampling. Density is estimated in the course of the iteration, and density is corrected using thus estimated density. Density estimation is performed not only on initial values but also on every iteration process, thereby enabling convergence with a smaller number of iterations.

公开(公告)号：US11686801B2

公开(公告)日：2023-06-27

申请号：US17731412

申请日：2022-04-28

申请人： FUJIFILM Healthcare Corporation

发明人： Shinji Kurokawa ,  Yasuhiro Kamada ,  Toru Shirai ,  Takenori Murase ,  Hiroki Shoji

IPC分类号： G01R33/56

CPC分类号： G01R33/5608

摘要： During obtaining a sensitivity distribution in a k-space, data based on which the sensitivity distribution is obtained is expanded with a mirror image to create an expanded image to prevent spectrum leakage, and the sensitivity distribution is stably calculated. During obtaining the sensitivity distribution in the k-space, image data based on which the sensitivity distribution is obtained is inverted as a mirror image to be made into the expanded image, the expanded image is transformed into k-space data, and a frequency component (frequency space data) of the sensitivity distribution is calculated. A region corresponding to the original image data is clipped from the calculated frequency space data, and the sensitivity distribution is obtained.