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：US10718839B2

公开(公告)日：2020-07-21

申请号：US15799025

申请日：2017-10-31

Applicant: GE Precision Healthcare LLC

Inventor： Yongchuan Lai ,  Xiaoli Zhao ,  Weiwei Zhang ,  Stephen Joseph Garnier ,  Lisha Nie ,  Pengfei Lu ,  Hongbin Wang

IPC: G01R33/56 ,  G01R33/36 ,  G01R33/34 ,  G01R33/565 ,  G01R33/3415

Abstract: The present invention provides a method and apparatus for correcting a uniformity of a magnetic resonance image, the method including: acquiring a first uniformity enhancement image by a phased-array uniformity enhancement method; and dividing the first uniformity enhancement image by a receiving sensitivity distribution value of a body coil in a magnetic resonance imaging device, so as to acquire a second uniformity enhancement image. The method further includes: dividing the second uniformity enhancement image by a spatial signal distribution value resulting from a field strength distribution of a transmitting radio-frequency field, so as to acquire a third uniformity enhancement image.

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：US20230080264A1

公开(公告)日：2023-03-16

申请号：US17891826

申请日：2022-08-19

Applicant: GE Precision Healthcare LLC

Inventor： Pengshuai Wang ,  Xuan Liu ,  Yongchuan Lai

IPC: G01R33/385 ,  G01R33/483 ,  G01R33/561

Abstract: The present disclosure relates to an MRI system and a method and device for determining a waveform of oblique scanning. Specifically, provided are a magnetic resonance imaging system, a method and device for determining a gradient waveform of oblique scanning, and a computer-readable storage medium. The method includes: generating an initial physical axis gradient waveform on a physical axis, the physical axis including a first physical axis, a second physical axis, and a third physical axis, wherein gradient waveforms on the three physical axes have the same inflection time; converting the initial physical axis gradient waveform into a logical axis gradient waveform, an inflection point of the logical axis gradient waveform being the same as the inflection time of the initial physical axis gradient waveform; re-converting the logical axis gradient waveform into a physical axis gradient waveform; and using, during the oblique scanning of magnetic resonance imaging, the converted physical axis gradient waveform to drive a gradient amplifier.

公开(公告)号：US11287493B2

公开(公告)日：2022-03-29

申请号：US17065058

申请日：2020-10-07

Applicant: GE Precision Healthcare LLC

Inventor： Longqing Wang ,  Weinan Tang ,  Kun Wang ,  Hongbin Wang ,  Yongchuan Lai ,  Jiabin Yao

IPC: G01V3/00 ,  G01R33/24 ,  G01R33/483 ,  G01R33/54

Abstract: Embodiments of the present invention provide a magnetic resonance imaging method and system and a computer-readable storage medium. The method comprises: performing pre-scanning, wherein a first sequence and a second sequence are separately performed on a plurality of slices; in the first sequence, two echoes are continuously obtained to respectively obtain first image data and second image data having a first phase offset; in the second sequence, two echoes are continuously obtained to respectively obtain third image data and fourth image data having a second phase offset, the first phase offset and the second phase offset having opposite directions but the same angle; obtaining a plurality of radio-frequency field maps respectively corresponding to the plurality of slices based on the first image data and the second image data, and obtaining a plurality of static magnetic field maps respectively corresponding to the plurality of slices based on at least one of the following two groups: a first image and a third image, and a second image and a fourth image; and calculating formal scanning parameters suitable for a corresponding slice based on at least one of the following two components: each radio-frequency field map, and a corresponding static magnetic field map.

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：US20240298912A1

公开(公告)日：2024-09-12

申请号：US18597760

申请日：2024-03-06

Applicant: GE Precision Healthcare LLC

Inventor： Ting Zhang ,  Yongchuan Lai ,  Wei Chang ,  Teresa Weng ,  Jia Guo

IPC: A61B5/026 ,  G01R33/54 ,  G01R33/563

CPC classification number: A61B5/0263 ,  G01R33/543 ,  G01R33/56308

Abstract: A magnetic resonance scanning and imaging method, and a magnetic resonance imaging system is presented. The method includes: according to a first correspondence between a blood flow rate and a spatial saturation band parameter, determining a first spatial saturation band parameter corresponding to a blood flow rate of a site to be examined; and by using a scan sequence related to the first spatial saturation band parameter, scanning the site to be examined, to acquire a magnetic resonance image of the site to be examined.

公开(公告)号：US10705170B1

公开(公告)日：2020-07-07

申请号：US16277922

申请日：2019-02-15

Applicant: GE Precision Healthcare LLC

Inventor： Dan Wu ,  Shiyu Li ,  Qingyu Dai ,  Kun Wang ,  Jiabin Yao ,  Yongchuan Lai

IPC: G01V3/00 ,  G01R33/56 ,  G06T11/00 ,  G01R33/385 ,  G06T5/00

Abstract: Spike noise in a k-space dataset acquired in magnetic resonance imaging may be removed by generating a mask including a set of data points which constitute spike noise in the k-space dataset based on the acquired k-space dataset via a trained deep learning network, the mask corresponding to a location of the spike noise in the acquired k-space dataset. An image reconstructed based on the acquired k-space dataset and the mask may be displayed.

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：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.