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.