Figure 5: Illustration of the segmentation results at the height of the basal ganglia (test subject 9, slice 22). The basal ganglia should be segmented as gray matter. The first three images show the three MRI sequences. The fourth image (reference) is the manually segmented reference standard (yellow: white matter, light blue: gray matter, and dark blue: cerebrospinal fluid). The results of the participating segmentation algorithms are ordered from the best overall performance (BIGR2) to the worst overall performance (LNMBrains). Major differences are present in the segmentation of the basal ganglia and the outer border of the cerebrospinal fluid. The arrows indicate example locations where the segmentation results differ from the ground truth.