Harsh K. Agarwal1, Xiaofeng Liu1,
Khaled Z. Abd-Elmoniem2, Jerry L. Prince1
1Department of Electrical and Computer
Engineering, The Johns Hopkins University, Baltimore, MD, United States; 2National
Institute of Diabetes and Digestive and Kidney Diseases, National Institutes
of Health, Bethesda, MD, United States
Off-resonance
due to magnetic field inhomogeneity causes geometric distortion in tagged
images acquired using a segmented spiral k-space data acquisition. This
causes erroneous alignment of horizontal and vertical tag acquisitions and
inaccurate displacement estimation. A
technique based on fast marching HARP refinement is proposed to estimate and
correct for the distortion. Improved motion estimation is demonstrated on an
in vivo data set.