Improved Spatial Resolution and Reduction of Artifacts in Strain-Maps with Phase-Unwrap HARP

HARP-images of each harmonic peak. The phase is distorted due to B0-inhomogeneity, e.g. in the liver. d) (=b+c) B0-map. e) (=bd/2) Peak-combined HARP-image: Phase wraps of B0-map are present, impairing HARP-analysis. f) Unwrapped B0-map. g) (=b-f/2) Peak-combined HARP-image: No phase distortions (wraps aligned with taglines) and no phase-wraps from B0-map. h) Fully unwrapped peak-combined HARPimage. i) Masked image showing the difference between the original phase of the landmark point (blue ‘x’) and the phase value at each pixel in the new time frame. The starting point of the HARP-search is moved from the blue to the red ‘x’).