Moosa Zaidi1, Joseph Cheng1, Tao Zhang1, and John Pauly1
Sensitivity to motion remains a major limitation to the
clinical utility of MRI. Self-navigating Cartesian trajectory (Butterfly) can provide
coil-by-coil estimates of local linear translation without lengthening scan
time or requiring external sensors. We
propose to combine translational motion estimates with the geometry of the
differing coil sensitivities to estimate global translation and rotation. These estimates can then be used to
retrospectively correct for motion. For
2D slices we are successfully able to extract both unknown rotation with known
translation and unknown translation and unknown rotation. Extension to 3D is a promising direction for
future work.
