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
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