公开(公告)号：US20240410963A1

公开(公告)日：2024-12-12

申请号：US18737408

申请日：2024-06-07

Applicant: GE Precision Healthcare LLC

Inventor： Lei Gao ,  Hanbei Zhang ,  Wei Chang ,  Huijing Zhou ,  Yongchuan Lai

IPC: G01R33/36

Abstract: Embodiments of the present application provide a magnetic resonance scanning and imaging method, and a magnetic resonance imaging system. The method includes: determining a pulse to be adjusted in a scan sequence, the pulse to be adjusted including a first radio-frequency pulse and a first gradient pulse applied along with the first radio-frequency pulse; determining an adjustment factor based on the first gradient pulse and a minimum repetition time related to a specific absorption rate of radio-frequency energy; adjusting the scan sequence based on the adjustment factor; and, using the adjusted scan sequence, performing a diagnostic scan on a site to be examined, to obtain a magnetic resonance image.

公开(公告)号：US12044760B2

公开(公告)日：2024-07-23

申请号：US18056574

申请日：2022-11-17

Applicant: GE Precision Healthcare LLC

Inventor： Lei Gao ,  Hua Li ,  Xuan Liu ,  Yongchuan Lai ,  Jiabin Yao

IPC: G01R33/48 ,  G01R33/385

CPC classification number: G01R33/4818 ,  G01R33/385

Abstract: A magnetic resonance imaging system and method, and a computer-readable storage medium are provided. The magnetic resonance imaging method includes: acquiring a plurality of k-space data sets by using a plurality of imaging sequences, each imaging sequence comprising a pre-phase-dispersion gradient pulse and a plurality of phase encoding gradients applied after the pre-phase-dispersion gradient pulse, wherein the pre-phase-dispersion gradient pulses of the plurality of imaging sequences have a standard area difference therebetween when ordered according to area values; respectively reconstructing magnetic resonance images from the respective k-space data sets; and averaging amplitudes of the magnetic resonance images to generate a magnetic resonance image of an average amplitude.

公开(公告)号：US20240192299A1

公开(公告)日：2024-06-13

申请号：US18079147

申请日：2022-12-12

Applicant: GE Precision Healthcare LLC

Inventor： Hua Li ,  Lei Gao ,  Gaohong Wu

IPC: G01R33/565 ,  G01R33/48 ,  G01R33/563

CPC classification number: G01R33/56518 ,  G01R33/4818 ,  G01R33/56341

Abstract: A method for correcting diffusion-weighted echo-planar imaging data (DW-EPI) includes obtaining a first reference scan with no diffusion gradients applied, a second reference scan with a diffusion gradient applied only along a frequency direction, a third reference scan with the diffusion gradient applied only along a phase direction, and a fourth reference scan with the diffusion gradient applied only along a slice direction acquired utilizing an MRI scanner, wherein the reference scans lack phase encoding. The method includes obtaining DW-EPI data acquired utilizing the MRI scanner, wherein the DW-EPI data includes phase errors due to oscillatory eddy currents causing time-varying Bo shift. The method includes generating a phase correction factor based on the reference scans and correcting the phase errors due to the oscillatory eddy currents in the DW-EPI data independent of diffusion gradient direction utilizing the phase correction factor to generate corrected DW-EPI data.

公开(公告)号：US20230168324A1

公开(公告)日：2023-06-01

申请号：US17989315

申请日：2022-11-17

Applicant: GE Precision Healthcare LLC

Inventor： Lei Gao ,  Yongchuan Lai

IPC: G01R33/48 ,  G01R33/385

CPC classification number: G01R33/4818 ,  G01R33/385

Abstract: A magnetic resonance imaging method, a magnetic resonance imaging system, and a computer-readable storage medium are provided. The magnetic resonance imaging method comprises: acquiring a plurality of portions of a k-space by using a plurality of sets of imaging sequences to obtain a plurality of k-space data sets, each set of imaging sequences comprising a pre-dephasing gradient pulse and a plurality of phase encoding gradients applied after the pre-dephasing gradient pulse, wherein the pre-dephasing gradient pulses in the plurality of sets of imaging sequences have a standard area difference in order when sorted according to the sizes of area values, and the standard area difference is 2/N of the area of any phase encoding gradient, where N is the number of sets of the plurality of sets of imaging sequences; respectively reconstructing a magnetic resonance image from each of the plurality of k-space data sets; and processing the plurality of k-space data sets to obtain a magnetic resonance image.

公开(公告)号：US11119175B2

公开(公告)日：2021-09-14

申请号：US16733731

申请日：2020-01-03

Applicant: GE Precision Healthcare LLC

Inventor： Lei Gao ,  Juan Gao ,  Xuan Liu ,  Yongchuan Lai ,  Jiabin Yao ,  Richard S Hinks

IPC: G01R33/565 ,  G01R33/561 ,  G01R33/563

Abstract: Systems and methods for suppressing Nyquist ghost for diffusion weighted magnetic resonance imaging are disclosed. An exemplary method includes acquiring multiple k-space data sets using multiple sets of diffusion weighted imaging pulse sequences, reconstructing a magnetic resonance image from each of the multiple k-space data sets respectively, and averaging magnitudes of the magnetic resonance images to generate an average magnitude magnetic resonance image.

公开(公告)号：US12105170B2

公开(公告)日：2024-10-01

申请号：US17989315

申请日：2022-11-17

Applicant: GE Precision Healthcare LLC

Inventor： Lei Gao ,  Yongchuan Lai

IPC: G01V3/00 ,  G01R33/385 ,  G01R33/48

CPC classification number: G01R33/4818 ,  G01R33/385

Abstract: A magnetic resonance imaging method, a magnetic resonance imaging system, and a computer-readable storage medium are provided. The magnetic resonance imaging method comprises: acquiring a plurality of portions of a k-space by using a plurality of sets of imaging sequences to obtain a plurality of k-space data sets, each set of imaging sequences comprising a pre-dephasing gradient pulse and a plurality of phase encoding gradients applied after the pre-dephasing gradient pulse, wherein the pre-dephasing gradient pulses in the plurality of sets of imaging sequences have a standard area difference in order when sorted according to the sizes of area values, and the standard area difference is 2/N of the area of any phase encoding gradient, where N is the number of sets of the plurality of sets of imaging sequences; respectively reconstructing a magnetic resonance image from each of the plurality of k-space data sets; and processing the plurality of k-space data sets to obtain a magnetic resonance image.

公开(公告)号：US12123933B2

公开(公告)日：2024-10-22

申请号：US18079147

申请日：2022-12-12

Applicant: GE Precision Healthcare LLC

Inventor： Hua Li ,  Lei Gao ,  Gaohong Wu

IPC: G01V3/00 ,  G01R33/48 ,  G01R33/563 ,  G01R33/565

CPC classification number: G01R33/56518 ,  G01R33/4818 ,  G01R33/56341

Abstract: A method for correcting diffusion-weighted echo-planar imaging data (DW-EPI) includes obtaining a first reference scan with no diffusion gradients applied, a second reference scan with a diffusion gradient applied only along a frequency direction, a third reference scan with the diffusion gradient applied only along a phase direction, and a fourth reference scan with the diffusion gradient applied only along a slice direction acquired utilizing an MRI scanner, wherein the reference scans lack phase encoding. The method includes obtaining DW-EPI data acquired utilizing the MRI scanner, wherein the DW-EPI data includes phase errors due to oscillatory eddy currents causing time-varying B0 shift. The method includes generating a phase correction factor based on the reference scans and correcting the phase errors due to the oscillatory eddy currents in the DW-EPI data independent of diffusion gradient direction utilizing the phase correction factor to generate corrected DW-EPI data.

公开(公告)号：US20220392035A1

公开(公告)日：2022-12-08

申请号：US17339345

申请日：2021-06-04

Applicant: GE PRECISION HEALTHCARE LLC

Inventor： Lei Gao ,  Juan Gao ,  Gaohong Wu ,  Yongchuan Lai

IPC: G06T5/50 ,  G06T5/20 ,  G01R33/56 ,  G01R33/563 ,  G01R33/565

Abstract: A magnetic resonance (MR) imaging method of correcting nonuniformity in diffusion-weighted (DW) MR images of a subject is provided. The method includes applying a DW pulse sequence along a plurality of diffusion directions with one or more numbers of excitations (NEX), and acquiring a plurality of DW MR images of the subject along the plurality of diffusion directions with the one or more NEX. The method also includes deriving a reference image and a base image based on the plurality of DW MR images, generating a nonuniformity factor image based on the reference image and the base image, and combining the plurality of DW MR images into a combined image. The method also includes correcting nonuniformity of the combined image using the nonuniformity factor image, and outputting the corrected image.

公开(公告)号：US20240353516A1

公开(公告)日：2024-10-24

申请号：US18639710

申请日：2024-04-18

Applicant: GE Precision Healthcare LLC

Inventor： Lei Gao ,  Yongchuan Lai

IPC: G01R33/56 ,  G01R33/48

CPC classification number: G01R33/5608 ,  G01R33/4818

Abstract: A magnetic resonance scanning and imaging method and a magnetic resonance imaging system are provided. The method includes: performing a reference scan on a site to be examined, acquiring reference scan data corresponding to a portion of slice positions among a plurality of slice positions, and generating, according to the reference scan data, a phase correction coefficient corresponding to each slice position among the plurality of slice positions; and performing, according to the phase correction coefficients, a diagnostic scan on the site to be examined to acquire a magnetic resonance image.

公开(公告)号：US20240345195A1

公开(公告)日：2024-10-17

申请号：US18632101

申请日：2024-04-10

Applicant: GE Precision Healthcare LLC

Inventor： Lei Gao ,  Yongchuan Lai

IPC: G01R33/563 ,  G01R33/48 ,  G01R33/561

CPC classification number: G01R33/56341 ,  G01R33/4818 ,  G01R33/5616

Abstract: A magnetic resonance imaging system and method is provided. The magnetic resonance imaging method comprises: in a single signal acquisition, applying a plurality of diffusion-weighted imaging sequences in a plurality of diffusion directions, respectively, to acquire a plurality of k-space data sets. Each diffusion-weighted imaging sequence comprising a pre-dephasing gradient pulse and a plurality of phase encoding gradient pulses applied after the pre-dephasing gradient pulse, and the pre-dephasing gradient pulses in the plurality of diffusion-weighted imaging sequences, when sorted according to area values, successively having a first standard area difference determined on the basis of the number of the plurality of diffusion directions. The method further includes performing data fusion processing on the plurality of k-space data sets in the single signal acquisition to obtain a magnetic resonance image.