Fig. 4.

Example of predictions from a tensor fit (left) panel and from a Gaussian process fit (right) panel to a crossing fibre voxel in the Centrum Semiovale in the region where the superior longitudinal fasciculus II crosses the corticospinal tract. The data is a single shell with a b-value of 3000. The data is shown as red dots and the model prediction as a grey surface. As expected the Gaussian process shows a much better ability to predict the data from such voxels despite being even faster to calculate than the tensor prediction.