Diffusion Tensor
Imaging is frequently affected by long-term subject motion. Intermediate pseudo-trace-weighted
images enable a real-time image registration with low sensitivity
to contrast variation between diffusion-weighted images. These registration results are used to correct the imaging
parameters of the ongoing scan. The algorithm was evaluated on three individual
subjects using a dedicated diffusion-weighted imaging sequence. The prospective
motion correction was able to reduce the typical long-term motion to a band of approximately ±0.2mm for translational and ±0.2° for rotational motion, which is far below
voxel size, without increasing the total scan time or changing the set of
diffusion vectors.
