Figure 2.

(A) Investigator wearing the AR headset and performing the planning step with the AR application for guidance, using an in-house designed handheld stylus and a stationary reference star, adopted from the Brainlab Curve neuronavigation system. (B) View from within the AR headset, as seen by the investigator at the moment after patient registration and before tumor projection and delineation. The AR overlay shows the 3D tumor and ventricle models in their correct anatomical position. The black cross marked on the patient's skin indicates the central entry point, as predefined by the experienced neurosurgeon. The RGB axes visible on the Brainlab reference star indicate the established 3D cartesian coordinate system in which the patient's position is being tracked. The RGB axes visible on the handheld stylus indicate its correct tracking, along with the white dot aligned on its tooltip.