Accuracy of CT based

Zinreich et al. [67] describe accuracy experiments performed with the ISG Viewing Wand and using CT data. Their experiment consisted of performing homologous point matching registrations with various sets of markers. The main conclusions of this work can be summarized as follows.

• The average error found was 1.7 mm with a standard deviation of 0.9 mm. Maximum errors were between 4 and 5 mm.
• The error was smaller when chosen landmarks were widely dispersed.
• The error was larger when landmarks were in the same plane.
• When landmarks were in the same region, the error tended to increase with the distance from this region.