US 12,216,188 B2
Method and apparatus for limiting radio frequency alternating magnetic field in magnetic resonance imaging
Ying Lun Wang, Shenzhen (CN); Qiu Yi Zhang, Shenzhen (CN); and Zhi Bin Li, Shenzhen (CN)
Assigned to Siemens Healthineers AG, Erlangen (DE)
Filed by Siemens Healthcare GmbH, Erlangen (DE)
Filed on Mar. 27, 2023, as Appl. No. 18/126,509.
Claims priority of application No. 202210310391.1 (CN), filed on Mar. 28, 2022.
Prior Publication US 2023/0305091 A1, Sep. 28, 2023
Int. Cl. G01R 33/565 (2006.01); A61B 5/055 (2006.01); G01R 33/28 (2006.01); G01R 33/34 (2006.01); G01R 33/341 (2006.01)
CPC G01R 33/5659 (2013.01) [G01R 33/288 (2013.01); G01R 33/34015 (2013.01); G01R 33/341 (2013.01); A61B 5/055 (2013.01)] 10 Claims
OG exemplary drawing
 
1. A method for limiting a B1 field used for magnetic resonance imaging (MRI), comprising:
obtaining a first intensity of the B1 field that is required for a thermal equilibrium temperature of a surface temperature of a local coil to be a maximum safety temperature when the local coil is placed at a predetermined position in a bore of a magnetic resonance (MR) scanner;
obtaining, based on (i) the first intensity of the B1 field, and (ii) a relationship between the surface temperature of the local coil and a scanning duration and an intensity of the B1 field during an MR scanning process, a second intensity of the B1 field that is required for the surface temperature of the local coil to increase by heating to the maximum safety temperature within a predetermined total MR scanning duration when the local coil is placed at the predetermined position; and
determining, based on the second intensity of the B1 field, a third intensity of the B1 field that is required when MR scanning is performed for the predetermined total MR scanning duration,
wherein the third intensity of the B1 field is not greater than the second intensity of the B1 field.