US 12,114,967 B2
Systems and methods of correcting effects of high-order concomitant fields in three-dimensional magnetic resonance imaging
Afis Ajala, Schenectady, NY (US); Seung-Kyun Lee, Cohoes, NY (US); and Thomas Kwok-Fah Foo, Clifton Park, NY (US)
Assigned to GE PRECISION HEALTHCARE LLC, Wauwatosa, WI (US)
Filed by GE PRECISION HEALTHCARE LLC, Wauwatosa, WI (US)
Filed on Jan. 18, 2023, as Appl. No. 18/156,161.
Prior Publication US 2024/0237911 A1, Jul. 18, 2024
Int. Cl. A61B 5/055 (2006.01); G01R 33/385 (2006.01); G01R 33/565 (2006.01); G01R 33/48 (2006.01)
CPC A61B 5/055 (2013.01) [G01R 33/385 (2013.01); G01R 33/56581 (2013.01); G01R 33/4824 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A magnetic resonance (MR) system, comprising:
a gradient coil assembly comprising an x gradient coil, a y gradient coil, and a z gradient coil, wherein the x gradient coil, the y gradient coil, or the z gradient coil is configured to apply a gradient field along an x direction (Gx), a gradient field along a y direction (Gy), or a gradient field along a z direction (Gz), respectively; and
a concomitant field correction computing device, comprising at least one processor in communication with at least one memory device, and the at least one processor programmed to:
receive MR signals acquired with the MR system using a three-dimensional (3D) pulse sequence, wherein a kx dimension and a ky dimension in k-space are sampled along non-Cartesian trajectories;
correct effects of concomitant fields generated by gradient fields applied by the gradient coil assembly by:
adjusting the MR signals with second-order concomitant phases accumulated from second-order concomitant fields, wherein the second-order concomitant phases vary as functions of time and spatial locations; and
reconstructing MR images based on the adjusted MR signals; and
output the MR images.