Unbalanced SSFP for super-resolution in MRI.

ABSTRACT:

Purpose

To achieve rapid, low specific absorption rate (SAR) super-resolution imaging by exploiting the characteristic magnetization off-resonance profile in SSFP.

Theory and methods

In the presented technique, low flip angle unbalanced SSFP imaging is used to acquire a series of images at a low nominal resolution that are then combined in a super-resolution strategy analogous to non-linear structured illumination microscopy. This is demonstrated in principle via Bloch simulations and synthetic phantoms, and the performance is quantified in terms of point-spread function (PSF) and SNR for gray and white matter from field strengths of 0.35T to 9.4T. A k-space reconstruction approach is proposed to account for B₀ effects. This was applied to reconstruct super-resolu

SUBMITTER: Lally PJ 

PROVIDER: S-EPMC8972796 | biostudies-literature | 2021 May

REPOSITORIES: biostudies-literature