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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