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. Author manuscript; available in PMC: 2014 Mar 1.
Published in final edited form as: Comput Med Imaging Graph. 2013 Feb 8;37(2):83–97. doi: 10.1016/j.compmedimag.2012.12.002

Fig. 2.

Fig. 2

Commonly employed optical tracking systems (a) Polaris Spectra™ from NDI and (b) Micron Tracker™ from Claron Technologies (Toronto, Canada), and magnetic tracking systems: (c) Aurora™ from NDI and (d) 3D Guidance™ from Ascension.