A unipolar head gradient for high-field MRI without encoding ambiguity.

ABSTRACT:

Purpose

MRI gradients with a conventional, bipolar design generally face a trade-off among performance, encoding ambiguity, and radiofrequency selectivity used to circumvent said ambiguity. This problem is particularly limiting in cutting-edge brain imaging performed at field strengths ≥ 7 T and using high-performance head gradients.

Methods

To address this issue, the present work proposes to fundamentally eliminate the encoding ambiguity in head gradients by using a unipolar z-gradient design that takes advantage of the signal-free range on one side of the imaging volume. This concept is demonstrated by implementation of a unipolar head gradient for operation at 7 T.

Results

Imaging in phantoms and in vivo demonstrates elimination of backfolding due to encoding ambig

SUBMITTER: Weiger M 

PROVIDER: S-EPMC12681299 | biostudies-literature | 2026 Feb

REPOSITORIES: biostudies-literature