Minimization of eddy current artifacts in sequences with periodic dynamics.

ABSTRACT:

Purpose

To minimize eddy current artifacts in periodic pulse sequences with balanced gradient moments as, for example, used for quantitative MRI.

Theory and methods

Eddy current artifacts in balanced sequences result from large jumps in k-space. In quantitative MRI, one often samples some spin dynamics repeatedly while acquiring different parts of k-space. We swap individual k-space lines between different repetitions in order to minimize jumps in temporal succession without changing the overall trajectory. This reordering can be formulated as a traveling salesman problem and we tackle the discrete optimization with a simulated annealing algorithm.

Results

Compared to the default ordering, we observe a substantial reduction of artifacts in the reconstructed images and

SUBMITTER: Flassbeck S 

PROVIDER: S-EPMC12863431 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature