Murat Aksoy1, Samantha Jane Holdsworth1,
Stefan Tor Skare1,2, Roland Bammer1
1Department of Radiology, Stanford
University, Stanford, CA, United States; 2Karolinska Institute,
Stockholm, Sweden
Due
to the prolonged acquisition time in DTI, the likelihood of patient motion
increases. It is essential to correct for motion to assure the diagnostic
quality and accuracy of tensor orientation in DTI. For interleaved sequences,
such as Short-Axis Propeller-EPI, patient motion causes the b-matrix to vary
between different parts of k-space. It was previously shown that correction
of motion artifacts in this case requires non-linear methods. In this study,
we investigated the effects of b-matrix correction on fiber tractography with
high resolution DTI. Results showed that b-matrix correction is necessary to
get accurate fiber tracts in moving subjects.