Quarles & Brady
Correction of artifacts caused by Maxwell terms in MR echo-planar images
 A method for correcting Maxwell field induced distortion, ghosting, and blurring artifacts in non-axially oriented EPI images is disclosed. In one embodiment phase corrections are calculated and used to offset Maxwell term errors during the image reconstruction process, and in another embodiment corrections are made after the image is reconstructed. 
General Electric Company
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A61B A61B G01R A61B G01R
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Xiaohong Matthew A. Joseph K. Yiping
Zhou Bernstein Maier Du