Abstract #4269

Measuring Magnetic Field Inhomogeneity From Spatial Distortion of Echo Planar Images

Peter Andrew Hardy¹ and Erfan Akbari²

¹Radiology, University of Kentucky, Lexington, KY, United States, ²Radiation Medicine, University of Kentucky, Lexington, KY, United States

We developed an imaging and analysis method to use the spatial distortion in echo planar images to estimate the magnetic field inhomogeneity. The method requires the acquisition of two images from an unmodified echo planar sequence with the direction of the phase encode reversed between the two. After combining the images appropriately an undistorted and a displacement image are produced. The displacement image is a map of the local magnetic field inhomogeneity.

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