Accuracy investigations for volumetric head-motion navigators with and without EPI at 7 T.

ABSTRACT:

Purpose

Accuracy investigation of volumetric navigators for motion correction, with emphasis on geometric EPI distortions at ultrahigh field.

Methods

High-resolution Dixon images were collected in different head positions and reconstructed to water, fat, T₂ *, and B₀ maps. Resolution reduction was performed, and the T₂ * and B₀ maps were used to apply effects of TE and EPI distortions to simulate various volumetric water and fat navigators. Registrations of the simulated navigators were compared with registrations of the original high-resolution images.

Results

Increased accuracy was observed with increased spatial resolution for non-EPI navigators. When using EPI, the distortions had a negative effect on registration accura

SUBMITTER: Andersen M 

PROVIDER: S-EPMC9325528 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature