Prediction of motion induced magnetic fields for human brain MRI at 3 T.

ABSTRACT:

Objective

Maps of B₀ field inhomogeneities are often used to improve MRI image quality, even in a retrospective fashion. These field inhomogeneities depend on the exact head position within the static field but acquiring field maps (FM) at every position is time consuming. Here we propose a forward simulation strategy to obtain B₀ predictions at different head-positions.

Methods

FM were predicted by combining (1) a multi-class tissue model for estimation of tissue-induced fields, (2) a linear k-space model for capturing gradient imperfections, (3) a dipole estimation for quantifying lower-body perturbing fields (4) and a position-dependent tissue mask to model FM alterations caused by large motion effects. The performance of the combined simulation stra

SUBMITTER: Zhou J 

PROVIDER: S-EPMC10504152 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature