US 11,698,427 B2
Methods and systems for estimating transmit attenuation for a magnetic resonance imaging scan
Anand Kumar Venkatachari, Brookfield, WI (US); Ling Sun, Brookfield, WI (US); and Wei Sun, Brookfield, WI (US)
Assigned to General Electric Company, Schenectady, NY (US)
Filed by General Electric Company, Schenectady, NY (US)
Filed on Oct. 12, 2021, as Appl. No. 17/499,295.
Application 17/499,295 is a continuation in part of application No. 16/101,199, filed on Aug. 10, 2018, granted, now 11,175,367.
Prior Publication US 2022/0026511 A1, Jan. 27, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. G01R 33/44 (2006.01); G01R 33/54 (2006.01); G01R 33/483 (2006.01); G01R 33/36 (2006.01)
CPC G01R 33/443 (2013.01) [G01R 33/3614 (2013.01); G01R 33/4835 (2013.01); G01R 33/543 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A method for a magnetic resonance imaging (MM) system, comprising:
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 final value.