Abstract #0737
Comprehensive Geometric Distortion Correction for Diffusion Tensor Imaging at Ultra-High Field
Myung-Ho In 1 , Oleg Posnansky 1 , and Oliver Speck 1,2
1
Biomedical Magnetic Resonance,
Otto-von-Guericke University, Magdeburg, Germany,
Magdeburg, Germany,
2
Leibniz
Institute for Neurobiology, Magdeburg, Germany,
Magdeburg, Germany
A well-known problem in echo-planar imaging (EPI) is
geometric distortion due to field inhomogeneities
induced by susceptibility effects. In diffusion weighted
EPI (DW-EPI), in addition, the distortions vary due to
eddy-currents from diffusion gradients. To correct both
susceptibility and eddy-current induced distortions, a
comprehensive approach using the point spread function
(PSF) mapping based methods is presented. An extended
PSF method with a reversed gradient approach suggested
recently was adapted for susceptibility-induced
distortion correction, and a fast PSF-based eddy-current
calibration method is newly suggested in this study. The
combination of the methods thus allows distortion-free
DW-EPIs without loss of spatial resolution.
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