Fig. 12.

Resulting y-displacement curves overlaid over the sampled respiratory displacement curve are given exemplary for an acquisition with $L=4$. Thereby, the input displacement (ground truth) is given in blue, the transformation parameters obtained after registration of the low-b slices in red, and the interpolated transformation parameters for all slices in black. The green circle focuses on an outlier in the estimated transformations. It corresponds to a $b=0$ slice, located at the border of the spatial volume. The employed weighting strategy did not include these transformations in the interpolation routine. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)