Distortion correction using topup algorithm by single k-space (TASK) for echo planar imaging.

ABSTRACT: Distortion of echo planar imaging (EPI) can be corrected using B₀ field maps, which can be estimated with the topup algorithm that requires two EPI images with opposite distortions. In this study, we propose a new algorithm, termed topup algorithm by single K-space (TASK), to generate two input images from a single k-space for the topup algorithm to correct EPI distortions. The centric EPI contains the opposite phase-encoding polarities in one k-space, which can be divided into two halves with opposite distortions. Therefore, two inputs could be extracted by dividing the k-space into halves and processing them using the proposed procedure including an iterative procedure of automatic brain masking and uniformity correction. The efficiency of TASK was evaluated using 3D EPI. Quan

SUBMITTER: Hwang SH 

PROVIDER: S-EPMC10618273 | biostudies-literature | 2023 Oct

REPOSITORIES: biostudies-literature