Two regions of interest (A: red nucleus and B: ventral intermediate nucleus) are illustrated using the software's brush application. The dentate-rubro-thalamic tract on axial T1-weighted images at the level of the dentate nucleus (C), the red nucleus (D), the thalamus (E), and the precentral gyrus (F). Images of the fibre tract and the DBS electrode reconstructed in 3D (G and H). The photos are collected from the first case. (For an explanation of the colour references in this figure legend, please see the online version of this article.)