Three-dimensional MR imaging of heart wall motion

Spatial modulation of magnetization (SPAMM) produces parallel planes of altered magnetization. These planes intersect the imaging plane and produce tagging stripes that move with the heart wall. Two sets of tagging planes perpendicular to the imaging plane produce a grid of stripes that can be used to follow in-plane motion. To assess through-plane motion, the authors apply a third set of tagging planes, inclined at an oblique angle to the others. The intersection of these tagging planes with the imaging plane will form a third set of stripes that will move relative to the others with through-plane motion