Figure 3.

Neurotech operation planning software can “feel” the 6 contrast agent points (A, B, C, D, E, and F) on the Leksell frame at the level of each target point in axial lamina MRI. These 6 contrast points should be manually matched (arrows on keyboard) as shown in the green circle (zoom in a contrast agent point). The cross should be located at the center of contrast agent (white in green circle). Once 6 contrast points are accurately matched, the location (X, Y, Z) and direction (α and β angles) of an electrode are calculated with Neurotech operation planning software. MRI = magnetic resonance imaging.