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. Author manuscript; available in PMC: 2013 Nov 7.
Published in final edited form as: Med Image Anal. 2007 Mar 1;11(2):10.1016/j.media.2006.11.002. doi: 10.1016/j.media.2006.11.002

Fig. 8.

Fig. 8

Phantom Experiment Results. (a) Mean Shift error in mm, between the measured and predicted shift. Measured shift is defined as the displacement of the bearings as measured during subsequent CT scans. (b) Mean angular (θ) error in degrees between the measured and predicted shift. I and II represent water drainage levels of 50% and 90% respectively. Surface represents displacements of the bearings fixed on the phantom surface and were used to constrain the inverse model whereas Target represents the displacements of bearings implanted inside the phantom and were used as unbiased error estimators. The average measured surface shift of the phantom was 10.1 ± 4.5 mm, and 21.2 ± 9.3 mm for drainage conditions I and II, respectively. The average measured target shift of the phantom was 5.6 ± 2.1 mm, and 11.3 ± 4.3 mm for drainage conditions I and II, respectively.