FIG. 4.

Motion estimation (a), reconstructed multi-contrast images (b), and the estimated quantitative maps before and after correction (c) in the simulation experiment (frequent random motion). The designed 4D-navigator acquisition provides accurate estimation for all the 6 motion parameters, and the motion artifacts in the reconstructed multi-contrast images are effectively reduced after motion correction. After motion correction, the error of all the quantitative parameters is significantly reduced (ME: mean error, MPE: mean percentage error), and multi-parametric maps without noticeable artifacts are obtained.