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US 12,216,188 B2Granted
Method and apparatus for limiting radio frequency alternating magnetic field in magnetic resonance imaging
AssigneeSiemens Healthineers AG
InventorsYing Lun Wang, Qiu Yi Zhang, Zhi Bin Li
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Abstract
A method and apparatus are provided for limiting a B1 field used for magnetic resonance imaging (MRI). The techniques described herein reduce a waste of performance of the B1 field while ensuring patient safety and improving the MR imaging quality.
Claims10
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.
2 more elements
An apparatus for limiting a B1 field used for magnetic resonance imaging (MRI), comprising:
- a computer readable medium having instructions stored thereon;
- and
- a processor configured to execute the instructions stored on the computer-readable medium to cause the apparatus to:
- obtain a first intensity of a 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;
- and
- obtain, 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 local coil to be heated to the maximum safety temperature within a predetermined total MR scanning duration when the local coil is placed at the predetermined position;
- and
- determine, 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.
6 more elements
Dependencies are inferred from the claim text.