公开(公告)号：US10859645B2

公开(公告)日：2020-12-08

申请号：US15995051

申请日：2018-05-31

Applicant: General Electric Company

Inventor： Shaorong Chang ,  Eric Printz ,  Ling Sun ,  Anja Kammeier ,  Charles Michelich ,  Zachary Slavens

IPC: G01R33/36 ,  G01R33/58 ,  G01R33/00 ,  G01R33/44

Abstract: Various methods and systems are provided for selecting coil elements of a plurality of coil elements of a radio frequency (RF) coil array for use in a magnetic resonance imaging (MRI) system. In one example, a method includes grouping the plurality of coil elements into receive elements groups (REGs) according to REGs information, generating channel sensitivity maps for the plurality of coil elements, generating REG sensitivity maps based on the REGs information and the channel sensitivity maps, labeling each REG as either selectable or not selectable based on the REG sensitivity maps, selecting one or more REGs from the selectable REGs based on the REG sensitivity maps and a region of interest (ROI), and scanning the ROI with the coil elements in the one or more selected REGs being activated and the coil elements not in any selected the other REGs being deactivated.

公开(公告)号：US20200049786A1

公开(公告)日：2020-02-13

申请号：US16101199

申请日：2018-08-10

Applicant: General Electric Company

Inventor： Anand Kumar Venkatachari ,  Ling Sun ,  Wei Sun

IPC: G01R33/58 ,  G01R33/24 ,  G01R33/565 ,  G01R33/46

Abstract: Various methods and systems are provided for correcting transmit attenuation of an amplifier of a transmit radio frequency (RF) coil for use in a magnetic resonance imaging (MRI) system. In one example, a method includes setting a reference value of transmit attenuation for an amplifier of a transmit radio frequency (RF) coil, acquiring a two-dimensional B1 field map with the transmit attenuation set at the reference value, determining a mean flip angle from the B1 field map, determining a transmit attenuation correction value based on a prescribed flip angle and the mean flip angle, correcting the reference value of transmit attenuation with the transmit attenuation correction value to obtain a final value of transmit attenuation, and performing an MRI scan with the transmit attenuation set at the value.

公开(公告)号：US11698427B2

公开(公告)日：2023-07-11

申请号：US17499295

申请日：2021-10-12

Applicant: General Electric Company

Inventor： Anand Kumar Venkatachari ,  Ling Sun ,  Wei Sun

IPC: G01R33/44 ,  G01R33/54 ,  G01R33/483 ,  G01R33/36

CPC classification number: G01R33/443 ,  G01R33/3614 ,  G01R33/4835 ,  G01R33/543

Abstract: Various methods and systems are provided for correcting transmit attenuation of an amplifier of a transmit radio frequency (RF) coil for use in a magnetic resonance imaging (MRI) system. In one example, a method includes setting a reference value of transmit attenuation for an amplifier of a transmit radio frequency (RF) coil, acquiring a three-dimensional B1 field map with the transmit attenuation set at the reference value, determining a plurality of mean flip angles for a plurality of slice locations in a pre-scan imaging volume from the B1 field map, determining a transmit attenuation correction value for each of the slice locations based on a prescribed flip angle and the mean flip angle determined for the respective slice location, correcting the reference value of transmit attenuation with the transmit attenuation correction value at each of the slice locations to obtain a final value of transmit attenuation for each of the slice locations, and performing an MRI scan with the transmit attenuation set at the value.

公开(公告)号：US20220026511A1

公开(公告)日：2022-01-27

申请号：US17499295

申请日：2021-10-12

Applicant: General Electric Company

Inventor： Anand Kumar Venkatachari ,  Ling Sun ,  Wei Sun

IPC: G01R33/44 ,  G01R33/36 ,  G01R33/483 ,  G01R33/54

Abstract: Various methods and systems are provided for correcting transmit attenuation of an amplifier of a transmit radio frequency (RF) coil for use in a magnetic resonance imaging (MRI) system. In one example, a method includes setting a reference value of transmit attenuation for an amplifier of a transmit radio frequency (RF) coil, acquiring a three-dimensional B1 field map with the transmit attenuation set at the reference value, determining a plurality of mean flip angles for a plurality of slice locations in a pre-scan imaging volume from the B1 field map, determining a transmit attenuation correction value for each of the slice locations based on a prescribed flip angle and the mean flip angle determined for the respective slice location, correcting the reference value of transmit attenuation with the transmit attenuation correction value at each of the slice locations to obtain a final value of transmit attenuation for each of the slice locations, and performing an MRI scan with the transmit attenuation set at the value.

公开(公告)号：US11175367B2

公开(公告)日：2021-11-16

申请号：US16101199

申请日：2018-08-10

Applicant: General Electric Company

Inventor： Anand Kumar Venkatachari ,  Ling Sun ,  Wei Sun

IPC: G01R33/58 ,  G01R33/46 ,  G01R33/565 ,  G01R33/24

Abstract: Various methods and systems are provided for correcting transmit attenuation of an amplifier of a transmit radio frequency (RF) coil for use in a magnetic resonance imaging (MRI) system. In one example, a method includes setting a reference value of transmit attenuation for an amplifier of a transmit radio frequency (RF) coil, acquiring a two-dimensional B1 field map with the transmit attenuation set at the reference value, determining a mean flip angle from the B1 field map, determining a transmit attenuation correction value based on a prescribed flip angle and the mean flip angle, correcting the reference value of transmit attenuation with the transmit attenuation correction value to obtain a final value of transmit attenuation, and performing an MRI scan with the transmit attenuation set at the value.

公开(公告)号：US20190369180A1

公开(公告)日：2019-12-05

申请号：US15995051

申请日：2018-05-31

Applicant: General Electric Company

Inventor： Shaorong Chang ,  Eric Printz ,  Ling Sun ,  Anja Kammeier ,  Charles Michelich ,  Zachary Slavens

IPC: G01R33/36 ,  G01R33/58 ,  G01R33/44 ,  G01R33/00

Abstract: Various methods and systems are provided for selecting coil elements of a plurality of coil elements of a radio frequency (RF) coil array for use in a magnetic resonance imaging (MRI) system. In one example, a method includes grouping the plurality of coil elements into receive elements groups (REGs) according to REGs information, generating channel sensitivity maps for the plurality of coil elements, generating REG sensitivity maps based on the REGs information and the channel sensitivity maps, labeling each REG as either selectable or not selectable based on the REG sensitivity maps, selecting one or more REGs from the selectable REGs based on the REG sensitivity maps and a region of interest (ROI), and scanning the ROI with the coil elements in the one or more selected REGs being activated and the coil elements not in any selected the other REGs being deactivated.