公开(公告)号：US11698427B2

公开(公告)日：2023-07-11

申请号：US17499295

申请日：2021-10-12

申请人： General Electric Company

发明人： Anand Kumar Venkatachari ,  Ling Sun ,  Wei Sun

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

CPC分类号： G01R33/443 ,  G01R33/3614 ,  G01R33/4835 ,  G01R33/543

摘要： 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：US20200049786A1

公开(公告)日：2020-02-13

申请号：US16101199

申请日：2018-08-10

申请人： General Electric Company

发明人： Anand Kumar Venkatachari ,  Ling Sun ,  Wei Sun

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

摘要： 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：US20220026511A1

公开(公告)日：2022-01-27

申请号：US17499295

申请日：2021-10-12

申请人： General Electric Company

发明人： Anand Kumar Venkatachari ,  Ling Sun ,  Wei Sun

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

摘要： 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

申请人： General Electric Company

发明人： Anand Kumar Venkatachari ,  Ling Sun ,  Wei Sun

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

摘要： 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.