Figure 6.

Example of the sequence that the investigators followed within the AR application. (A) Patient installed in the Mayfield clamp, with the Brainlab reference star rigidly attached. 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 virtual skin model is matched to the patient's anatomy during the registration step, in which the boney surfaces along the patient's face are digitized with the handheld stylus, resulting in a point cloud (white dots). (B) After registration, the virtual patient anatomy is displayed in its actual location. Here the cerebrum is shown in pink, with a deep-seated tumor recurrence (located in a previous resection cavity) shown in green. (C) An orthographic projection of the tumor is shown on the patient's skin, allowing delineation of the tumor contours.