We
developed a parallel imaging accelerated Cine Watermark (CWM) sequence to
provide normal cine magnitude images plus phase image-only multi-directional
spatial encoding for quantitative cine strain -- while requiring no extra
operator effort. Spatial cosine
modulation post-processed by complex image sum/differencing produced separate
normal magnitude cine and unique phase-only spatial modulation for strain
calculation. In vivo human scans demonstrated good magnitude cine and phase-only
quantified displacement. Cardiac
strains were tracked by a novel non-linear least squares method combining
quadratic b-spline contours, nearest neighbor optimized phase tracking, and
physically-motivated regularizers. Cardiac left ventricular, short-axis,
circumferential strain results agreed with previous literature.
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