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Abstract #3415

An image-based method for undistorted image estimation from distorted brain EPI image with field inhomogeneity

Seiji Kumazawa1, Takashi Yoshiura2, Takumi Tanikawa1, and Yuji Yaegashi1

1Hokkaido University of Science, Sapporo, Japan, 2Kagoshima University, Kagoshima, Japan

Our purpose was to develop an image-based method for undistorted image estimation from the distorted EPI image using T1 weighted image. Our basic idea to estimate the field inhomogeneity map is to reproduce the distorted EPI image, and estimates the undistorted image using the estimated field inhomogeneity map based on the signal equation in a single-shot EPI k-space trajectory. The value of the NRMSE between the measured EPI and synthesized EPI was 0.017, and both images were in good agreement. Results demonstrate that our proposed method was able to perform a reasonable estimation of the field inhomogeneity map and undistorted EPI image.

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