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Abstract #2698

A Novel Correction Method for Distortion Correction in EPI at Ultra-High Field MRI using PSF Mapping Technique

Se-Hong Oh1, Jun-Young Chung1, Myung-Ho In2, Maxim Zaitsev3, Oliver Speck2, Young-Bo Kim1, Zang-Hee Cho1

1Neuroscience Research Institute, Gachon University of Medicine and Science, Incheon, Korea, Republic of; 2Department of Biomedical Magnetic Resonance, Institute for Experimental Physics, Otto-von-Guericke University Magdeburg, Magdeburg, Germany; 3Department of Radiologic Research, Medical Physics, University Hospital of Freiburg, Freiburg, Germany

Echo-planar imaging (EPI) is one of the fastest and most widely used MRI pulse sequences in the field of MRI. Compared to conventional imaging sequence, EPI is more prone to a variety of artifacts. A prominent EPI artifact is geometric distortion due to strong magnetic field inhomogeneity and susceptibility. Recently, a number of different approaches have been proposed for correcting the distortion in EPI, one of them is the point spread function (PSF) mapping method. PSF distortion correction techniques are now extensively used and are successful in the low field strength MRI such as 1.5T or 3.0T. These techniques, however, are still unable to correct distortions in UHF MRI.