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. Author manuscript; available in PMC: 2016 Dec 1.
Published in final edited form as: Int J Comput Assist Radiol Surg. 2015 Jul 21;10(12):2009–2020. doi: 10.1007/s11548-015-1255-5

Fig. 1.

Fig. 1

A typical axial CT image of the spine before (a) and after (b) image preprocessing, along with a photographic view of the phantom (c). Arrows indicate locations of implanted mini-screws passively serving as independent fiducials