Slice-direction geometric distortion evaluation and correction with reversed slice-select gradient acquisitions.

ABSTRACT: Accurate spatial alignment of MRI data acquired across multiple contrasts in the same subject is often crucial for data analysis and interpretation, but can be challenging in the presence of geometric distortions that differ between acquisitions. It is well known that single-shot echo-planar imaging (EPI) acquisitions suffer from distortion in the phase-encoding direction due to B₀ field inhomogeneities arising from tissue magnetic susceptibility differences and other sources, however there can be distortion in other encoding directions as well in the presence of strong field inhomogeneities. High-resolution ultrahigh-field MRI typically uses low bandwidth in the slice-encoding direction to acquire thin slices and, when combined with the pronounced B₀ inhomogeneities,

SUBMITTER: Blazejewska AI 

PROVIDER: S-EPMC9910288 | biostudies-literature | 2022 Dec

REPOSITORIES: biostudies-literature