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. Author manuscript; available in PMC: 2010 Dec 14.
Published in final edited form as: J Neurol Sci. 2009 Sep 19;287(1-2):159–171. doi: 10.1016/j.jns.2009.08.003

Figure 2. Figures 2A, 2B: Stealth Angle Measurements.

Figure 2

Figure 2

Figure 2A: Schematic diagram of the Stealth angle measurement for the surgical trajectory in relation to the axial plane. The angle ranges from −90 to +90 degrees. 0 degrees means the surgical trajectory is parallel to the axial plane. 90 degrees means the surgical trajectory is perpendicular to the axial plane. Positive numbers mean the entry point is superior to the target point. All surgical entry points for the surgical trajectory were superior to the target. For the AC-PC midline (entry) to target calculations, the positive numbers mean that the entry point is inferior to the target and the negative numbers mean the entry point is superior to the target.

Figure 2B: Schematic diagram of the Stealth angle measurement for the surgical trajectory in relation to the midsagittal plane. The angles range between 0 and 90 degrees. 0 degrees means the surgical trajectory is parallel to the midsagittal plane. 90 degrees means the surgical trajectory is perpendicular to the midsagittal plane.