Fig 4.

Postoperative electrophysiologic evaluation by using CT depiction of the DBS electrode artifacts. The 3D helical postoperative CT is superimposed on the planning data. Reconstruction along the main DBS electrode (white) axis, quasiaxial (A) and coronal (B). The minimal spatial distance to the medial border of the CST is 4.0 mm. B, The DBS electrode (inset; geometry; DBS lead model 3389; Medtronic) is seen as a white structure in the STN region. In this example, electrode contact 0 (EC0, deepest contact, 2.3 mm from the electrode tip) elicited capsular effects during postoperative clinical testing. C, 3D rendering of the right (rt) and left (lt) CSTs with DBS electrode artifacts from helical CT.