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. Author manuscript; available in PMC: 2013 Nov 6.
Published in final edited form as: IEEE Trans Biomed Eng. 2012 Aug 23;60(4):10.1109/TBME.2012.2215033. doi: 10.1109/TBME.2012.2215033

Fig. 9.

Fig. 9

Displacements of targets for five tracked pointer (blue) and tracked conoprobe (red) trials. If the translational component of TRE is large, and the rotational component small, the arrows point in largely the same direction. If the rotational component is large, the arrows diverge. In our datasets, the conoprobe acquisitions contain rotational and translational error, while the pointer acquisitions contain largely translational errors.