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Abstract #1526

An improved image-based method for field inhomogeneity map in distorted brain EPI image

Seiji Kumazawa1, Takashi Yoshiura2, Akihiro Kikuchi1, Go Okuyama1, and Masataka Kitama1

1Department of Radiological Technology, Faculty of Health Sciences, Hokkaido University of Science, Sapporo, Japan, 2Department of Radiology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan

To correct the distortion in EPI due to field inhomogeneity, an image-based method for estimating the field map from the distorted EPI image has been proposed. However, this method suffers from long computation times. Our purpose was to improve an image-based method in terms of the computation time. Whereas the previous method synthesized EPI image in k-space requiring a lot of execution of FFT, our method synthesized EPI image in the image-domain. Our method reduced the computation time in the almost same NRMSE in previous method. Our results suggest that our improved method was able to perform a reasonable estimation of the field map.

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