K-SpaceTrajectory Measurement with Signal Shifting
Beaumont M, Barbier E, Segebarth C, Lamalle L
U 594, Univ Grenoble 1
Different approaches for measuring k-space trajectory have been described in the literature. Self-encoding gradient techniques are time consuming due to the high number of phase encoding steps needed. The approach with off-center slice selections is faster but has apparently not been used to measuring high k-space values, when phase dispersion may lead to signal destruction, and to errors in the trajectories at the k-space periphery. To overcome this difficulty without significantly increasing the acquisition time, we propose an approach whereby a dephasing gradient is applied, prior to the gradient to be calibrated, to shift in time the signal maximum.