FIGURE 5.

Workflow for calculating trajectory accuracy, electrode deviation, and electrode accuracy. A, 3-dimensional model of selected electrode derived from postoperative computed tomography scan and loaded on S7 StealthStation. Yellow, electrode reconstruction; blue, planned trajectory; orange, executed trajectory through the electrode bolt. B, trajectory accuracy: lateral shift between planned and executed trajectories, in plane perpendicular to executed trajectory that passes through the target point. C, electrode deviation: lateral shift between electrode contact and executed trajectory, in plane perpendicular to executed trajectory that passes through target point. D, electrode accuracy: lateral shift between electrode contact and planned trajectory, in plane perpendicular to planned trajectory at target point.