US 12,433,503 B2Granted

Systems and methods of correcting effects of second-order concomitant fields in a magnetic resonance system with a second-order correction coil assembly

AssigneeGE Precision Healthcare LLC

InventorsSeung-Kyun Lee, Afis Ajala, Thomas Kwok-Fah Foo

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Abstract

A magnetic resonance (MR) system for correcting concomitant field effects is provided. The MR system includes a gradient coil assembly including a plurality of gradient coils configured to apply at least one gradient field to a polarizing magnetic field of the MR system. The MR system also includes a second-order correction coil assembly including a first second-order correction coil configured to correct effects of a first term of second-order concomitant fields generated by the at least one gradient field. The system further includes a second-order correction computing device including at least one processor in communication with at least one memory device. The at least one processor is programmed to control the second-order correction coil assembly by instructing the MR system to apply a compensation field to the second-order correction coil assembly asynchronously with the at least one gradient field.

Claims19

Dependent claims

A magnetic resonance (MR) system for correcting concomitant field effects, comprising:

a gradient coil assembly comprising a plurality of gradient coils configured to apply at least one gradient field to a polarizing magnetic field of the MR system;
a second-order correction coil assembly comprising a first second-order correction coil configured to correct effects of a first term of second-order concomitant fields generated by the at least one gradient field, wherein the second-order correction coil assembly further comprises a second second-order correction coil configured to correct a second term of the second-order concomitant fields, and the second-order correction coil assembly is configured to correct a third term of the second-order concomitant fields based on a combination of the first second-order correction coil and the second second-order correction coil, wherein the first term of the second-order concomitant fields, the second term of the second-order concomitant fields, and the third term of the second-order concomitant fields are different from one another;
and
a second-order correction computing device comprising at least one processor in communication with at least one memory device, and the at least one processor programmed to:
control the second-order correction coil assembly by instructing the MR system to apply a compensation field to the second-order correction coil assembly asynchronously with the at least one gradient field, wherein the compensation field has a different shape of waveform from a waveform of the at least one gradient field.

2 more elements

A method of correcting concomitant field effects in a magnetic resonance (MR) system, comprising:

installing a second-order correction coil assembly in an MR system, wherein the second-order correction coil assembly includes a first second-order correction coil configured to correct effects of a first term of second-order concomitant fields generated by a gradient coil assembly of the MR system, the second-order correction coil assembly further comprises a second second-order correction coil configured to correct a second term of the second-order concomitant fields, and the second-order correction coil assembly is configured to correct a third term of the second-order concomitant fields based on a combination of the first second-order correction coil and the second second-order correction coil, wherein the first term of the second-order concomitant fields, the second term of the second-order concomitant fields, and the third term of the second-order concomitant fields are different from one another;
instructing the MR system to apply a compensation field to the second-order correction coil assembly asynchronously with at least one gradient field by the gradient coil assembly;
and
controlling application of a trigger pulse to define a timing of applying the compensation field.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 18/156,144Filed 18 Jan 2023
Published: US 2024/0237910 A118 Jul 2024
Granted: 7 Oct 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification8 codes

A61B 5/055
Detecting, measuring or recording for diagnosis by means of electric currents or magnetic fields; Measuring using microwaves or radio waves:…
G01R 33/385
Systems for generation, homogenisation or stabilisation of the main or gradient magnetic field: using gradient magnetic field coils
G01R 33/3875
Compensation of inhomogeneities: using correction coil assemblies, e.g. active shimming
G01R 33/56554
Correction of image distortions, e.g. due to magnetic field inhomogeneities: caused by acquiring plural, differently encoded echo signals after…