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. Author manuscript; available in PMC: 2017 Jul 1.
Published in final edited form as: J Neurosurg. 2015 Dec 18;125(1):75–84. doi: 10.3171/2015.6.JNS15716

FIG. 1.

FIG. 1

Stereotactic accuracy. A: The angles encountered for the descending columns of the fornix (the solid line indicates the mean angle, 65.7°; the dashed line indicates the standard deviation, ± 7.5°; the dotted line indicates the range, 52.2–79.6°). B: Calculation of the radial (r) and vector (v) errors. The intended trajectory (dotted line) and target (circle) are shown, with the distance from the distal-most contact to the intended target measured. C: To-scale drawing showing the mean radial and vector errors to the distal-most contact of the Medtronic 3387 (Medtronic, Inc.) DBS lead. The bands indicate the 4 contacts on the lead. Used with permission from Barrow Neurological Institute, Phoenix, Arizona.