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• W4384828215 abstract "Abstract Distortion of echo planar imaging (EPI) can be corrected using B 0 field maps, which can be acquired 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. Quantitative evaluations showed that TASK corrected EPI distortion in a similar level to the traditional methods. The estimated field maps from the conventional topup and TASK showed high correlation ((r=0.8048pm 0.0534)). An ablation study showed the validity of every suggested step. Furthermore, it was confirmed that TASK was effective for distortion correction of two-shot centric EPI as well, demonstrating its wider applicability. In conclusion, TASK can correct EPI distortions by its own single k-space information with no additional scan." @default.
• W4384828215 created "2023-07-21" @default.
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• W4384828215 date "2023-07-19" @default.
• W4384828215 modified "2023-09-24" @default.
• W4384828215 title "Distortion correction using topup algorithm by single k- space (TASK) for echo planar imaging" @default.
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• W4384828215 doi "https://doi.org/10.21203/rs.3.rs-3108709/v1" @default.
• W4384828215 hasPublicationYear "2023" @default.
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