On the Impact of Artifacts Induced by Mismatches Between Auto-Calibration Signal and Accelerated 3D GRE Data at 11.7T.

ABSTRACT:

Purpose

The study aims at investigating B0$$ {B}_0 $$ field inhomogeneity artifacts arising from remote locations in the FOV and encountered in accelerated 3D gradient-recalled echo (GRE) sequences at ultra-high field, and at providing mitigation strategies.

Methods

Measurements were conducted at 11.7T using a head-shaped phantom and an accelerated 3D GRE sequence with either integrated or external auto-calibration signal (ACS) lines. Simulations were performed to reproduce the artifacts. The effects of varying GRAPPA reconstruction parameters (kernel size and regularization) were also examined.

Results

B0$$ {B}_0 $$ field inhomogeneities located outside the B0$$ {B}_0 $$ shimmed region of interest (i.e., the brain) were observed to return ripple-like artifacts within

SUBMITTER: Obriot J 

PROVIDER: S-EPMC12746375 | biostudies-literature | 2026 Mar

REPOSITORIES: biostudies-literature