IP Library › Granted Patent US 12,433,503
Granted Patent B2
US 12,433,503 · App. 18/156,144 · Granted Oct 7, 2025

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

Inventors: Seung-Kyun Lee (Cohoes, NY); Afis Ajala (Schenectady, NY); Thomas Kwok-Fah Foo (Clifton Park, NY)
Assignee: GE PRECISION HEALTHCARE LLC
A61B5/055G01R33/385G01R33/3875G01R33/56554G01R33/56581G01R33/389
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Quick Facts
Patent No.
US 12,433,503
App. No.
18/156,144
Granted
Oct 7, 2025
Kind
B2
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.

Claims (36)

1. 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. The MR system of claim 1 , wherein the at least one processor is programmed to:

control the second-order correction coil assembly by instructing the MR system to apply the compensation field having a different timing from a timing of the at least one gradient field.

3. The MR system of claim 1 , wherein the at least one processor is programmed to:

control the second-order correction coil assembly by instructing the MR system to apply the compensation field that has a different waveform from the waveform of the at least one gradient field.

4. The MR system of claim 1 , wherein the first second-order correction coil is a z 2 −(x 2 +y 2 )/2 correction coil, and the at least one processor is programmed to:

correct residual phase errors caused by the second-order concomitant fields by taking account of an x 2 spatial variation and a y 2 spatial variation in the compensation field generated by the first second-order correction coil.

5. The MR system of claim 4 , wherein the at least one processor is programmed to:

correct the residual phase errors by applying radio-frequency (RF) frequency modulation.

6. The MR system of claim 1 , wherein the first second-order correction coil is a z 2 −(x 2 +y 2 )/2 correction coil and the second second-order correction coil is an x 2 −y 2 correction coil.

7. The MR system of claim 1 , wherein the second-order correction coil assembly is configured to correct a z 2 −x 2 term of the second-order concomitant fields.

8. The MR system of claim 1 , wherein the second-order correction coil assembly is configured to correct a z 2 −y 2 term of the second-order concomitant fields.

9. The MR system of claim 1 , wherein the second-order correction coil assembly is configured to correct a z 2 term of the second-order concomitant fields.

10. The MR system of claim 1 , wherein the second-order correction coil assembly is configured to correct an x 2 +y 2 term of the second-order concomitant fields.

11. The MR system of claim 1 , wherein the first second-order correction coil is a local correction coil.

12. A second-order correction coil assembly for correcting concomitant field effects in a magnetic resonance (MR) system, comprising:

a first second-order correction coil configured to correct a first term of second-order concomitant fields generated by a gradient coil assembly of an MR system; and

a second second-order correction coil configured to correct a second term of the second-order concomitant fields,

wherein 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.

13. The second-order correction coil assembly of claim 12 , wherein the second-order correction coil assembly is configured to correct a z 2 −x 2 term of the second-order concomitant fields.

14. The second-order correction coil assembly of claim 12 , wherein the second-order correction coil assembly is configured to correct a z 2 −y 2 term of the second-order concomitant fields.

15. The second-order correction coil assembly of claim 12 , wherein the first second-order correction coil is a z 2 −(x 2 +y 2 )/2 correction coil and the second second-order correction coil is an x 2 −y 2 correction coil.

16. 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.

17. The method of claim 16 , wherein instructing the MR system further comprises:

instructing the MR system to apply the compensation field having a different timing from a timing of the at least one gradient field.

18. The method of claim 16 , wherein instructing the MR system further comprises:

instructing the MR system to apply the compensation field that has a different waveform from a waveform of the at least one gradient field.

19. The method of claim 16 , wherein the first second-order correction coil is a z 2 −(x 2 +y 2 )/2 correction coil, and the method further comprises:

correcting residual phase errors caused by the second-order concomitant fields by taking account of an x 2 spatial variation and a y 2 spatial variation in the compensation field generated by the first second-order correction coil.

Assignments (1)
ASSIGNMENT OF ASSIGNOR'S INTEREST Recorded Jan 18, 2023
From: LEE, SEUNG-KYUN; AJALA, AFIS; FOO, THOMAS KWOK-FAH
To: GE PRECISION HEALTHCARE LLC
Reel/Frame 062412/0382 →
Continuity (1)
Related Publication 20240237910A1 · Jul 18, 2024
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