Abstract #1587
Image-based estimation method for field inhomogeneity map in brain EPI image
Seiji Kumazawa 1 , Takashi Yoshiura 2 , Hiroshi Honda 2 , and Fukai Toyofuku 1
1
Department of Health Sciences, Faculty of
Medical Sciences, Kyushu University, Fukuoka, Fukuoka,
Japan,
2
Department
of Clinical Radiology, Graduate School of Medical
Sciences, Kyushu University, Fukuoka, Fukuoka, Japan
EPI suffers from geometrical distortion due to magnetic
field inhomogeneity. Our purpose was to develop an
image-based method for estimating the magnetic field map
based on the distorted EPI image and T1WI which requires
no additional acquisitions. Our method synthesizes the
distorted image to match the measured EPI image through
the generating process of EPI image by changing the
magnetic field. To evaluate the performance of our
method, we applied it to simulation data. Our
preliminary results demonstrate that the magnetic field
inhomogeneity in EPI image can be estimated by our
method without any additional acquisitions for
estimation of the field map.
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