Accelerated Navigator for Rapid ∆B₀ Field Mapping for Real-Time Shimming and Motion Correction of Human Brain MRI.

ABSTRACT: ∆B₀ shim optimization performed at the beginning of an MR scan is unable to correct for ∆B₀ field inhomogeneities caused by patient motion or hardware instability during scans. Navigator-based methods have been demonstrated previously to be effective for motion and shim correction. The purpose of this work was to accelerate volumetric navigators to allow fast acquisition of the parent navigated sequence with short real-time feedback time and high spatial resolution of the ∆B₀ field mapping. A GRAPPA-accelerated 3D dual-echo EPI vNav was implemented on a 3 T Prisma MRI scanner. Testing was performed on an anthropomorphic head phantom and 11 human participants. vNav-derived ∆B₀ field maps with various spatial resolutions were compared to Cartesian-

SUBMITTER: Jayadev NB 

PROVIDER: S-EPMC12409692 | biostudies-literature | 2025 Oct

REPOSITORIES: biostudies-literature