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. Author manuscript; available in PMC: 2015 May 20.
Published in final edited form as: Proc SPIE Int Soc Opt Eng. 2011 Feb 28;7886:78860L. doi: 10.1117/12.875635

Figure 1.

Figure 1

(a) a positioning wand with passive reflective spherical balls and (b) IR camera to monitor movement of a point in a 3D volume (205×186×147 cm3).