公开(公告)号：US10459052B2

公开(公告)日：2019-10-29

申请号：US16067204

申请日：2015-12-30

Applicant: Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences

Inventor： Hairong Zheng ,  Xin Liu ,  Chuanli Cheng ,  Chao Zou

IPC: G01R33/56 ,  G01R33/48 ,  A61B5/055 ,  G01R33/44 ,  G01R33/46 ,  G01R33/485 ,  G01R33/565

Abstract: Provided are a magnetic resonance chemical-shift-encoded imaging method, apparatus, and device, belonging to the technical field of magnetic resonance imaging. The method comprises: in a phasor-error plot established on the basis of a two-point magnetic resonance signal model, determining to be an initial seed point a pixel having a unique phasor and causing said plot to reach a minimal local value; according to the initial seed point, estimating the phasor value of a to-be-estimated pixel to obtain a field map; mapping and merging the field map at the highest resolution to obtain a reconstructed field map; determining a reconstructed seed point from the reconstructed field map, and estimating the reconstructed seed point to obtain the phasor value of the reconstructed to-be-estimated pixel; according to the reconstructed seed point and the phasor value of the reconstructed to-be-estimated pixel, obtaining two separate images having predetermined components. In the method, a region simultaneously containing two components is identified as a seed point, eliminating the deviation caused by phasor-value jump at high resolution and ensuring the correctness of the seed point ultimately selected.

公开(公告)号：US11249163B2

公开(公告)日：2022-02-15

申请号：US16977818

申请日：2017-11-27

Applicant: SHENZHEN INSTITUTES OF ADVANCED TECHNOLOGY

Inventor： Chao Zou ,  Chuanli Cheng ,  Xin Liu ,  Hairong Zheng

IPC: G01R33/565 ,  G01R33/561 ,  G01R33/56 ,  G01R33/48

Abstract: An eddy-current correction method and apparatus, a mobile terminal and a readable storage medium are provided. The method includes: step S1: reading gradient-recalled echo sequence by means of bipolarity, so as to acquire a multi-echo image; step S2: estimating a first-order term coefficient of an extra phase term introduced by an eddy-current in the acquired multi-echo image; step S3: removing the estimated first-order term coefficient, and estimating a zero-order term coefficient of the extra phase term introduced by the eddy-current in the collected multi-echo image; step S4: removing, according to the estimated first-order term coefficient and the zero-order term coefficient, an error of the extra phase term introduced by the eddy-current. The eddy-current correction method removes the phase error caused by the eddy-current in the acquired image, thereby ensuring the correctness of the subsequent water-fat separation algorithm result.

公开(公告)号：US10782379B2

公开(公告)日：2020-09-22

申请号：US16645798

申请日：2015-12-30

Applicant: SHENZHEN INSTITUTES OF ADVANCED TECHNOLOGY CHINESE ACADEMY OF SCIENCES

Inventor： Hairong Zheng ,  Xin Liu ,  Chuanli Cheng ,  Chao Zou

IPC: G01R33/565 ,  A61B5/055

Abstract: A method, an apparatus, and a device for magnetic resonance chemical shift encoding imaging are provided. The method includes in a phasor-error spectrum established based on a simplified multi-point magnetic resonance signal model, determining a pixel point having a unique phase factor value and causing the phasor-error spectrum to reach a local minimum value as an initial seed point; estimating a phase factor value of a pixel point to be estimated according to the initial seed point to obtain a field map; mapping and merging the field maps at the highest resolution to obtain a reconstructed field map; determining a reconstructed seed point from the reconstructed field map, and estimating the reconstructed seed point to obtain a phase factor value of a reconstructed pixel point to be estimated.

公开(公告)号：US20190011515A1

公开(公告)日：2019-01-10

申请号：US16067204

申请日：2015-12-30

Applicant: Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences

Inventor： Hairong Zheng ,  Xin Liu ,  Chuanli Cheng ,  Chao Zou

IPC: G01R33/48 ,  G01R33/565 ,  G01R33/485 ,  G01R33/46 ,  A61B5/055 ,  G01R33/44 ,  G01R33/56

Abstract: Provided are a magnetic resonance chemical-shift-encoded imaging method, apparatus, and device, belonging to the technical field of magnetic resonance imaging. The method comprises: in a phasor-error plot established on the basis of a two-point magnetic resonance signal model, determining to be an initial seed point a pixel having a unique phasor and causing said plot to reach a minimal local value; according to the initial seed point, estimating the phasor value of a to-be-estimated pixel to obtain a field map; mapping and merging the field map at the highest resolution to obtain a reconstructed field map; determining a reconstructed seed point from the reconstructed field map, and estimating the reconstructed seed point to obtain the phasor value of the reconstructed to-be-estimated pixel; according to the reconstructed seed point and the phasor value of the reconstructed to-be-estimated pixel, obtaining two separate images having predetermined components. In the method, a region simultaneously containing two components is identified as a seed point, eliminating the deviation caused by phasor-value jump at high resolution and ensuring the correctness of the seed point ultimately selected.