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Angles that define the position of the DBS electrode contacts relative to the Vc/Vim border. a) θ is the anterior-posterior angle of the electrode calculated from the stereotactic frame ring angle. b) Φ is the medial-lateral angle of the electrode calculated from the stereotactic frame arc angle. c) Ψ is the posterolateral angle of the Vc/Vim interface, approximated from histological data (Hirai et al., 1989).
