Erik B. Beall1,
Myung-Ho In2, Oliver Speck2, Ken E. Sakaie1,
Mark J. Lowe1
1Imaging
Institute, Cleveland Clinic, Cleveland, OH, United States; 2Biomedical
Magnetic Resonance, Otto-von-Guericke University, Magdeburg, Germany
Eddy current artifacts reduce resolving power of DTI scans and obliterate small fiber tracts. By acquiring forward and reverse phase-encodes for every direction and using new algorithms for unwarping these together, both the static and dynamic (diffusion direction, breathing and head position-dependent changes) field inhomogeneity can be removed. This dramatically improves the tensor fit error and uncovers structures invisible with only static unwarping.