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Accuracy of surgical tracking. a TRE measured without and with Pb glass at a tracker-to-target distance of ~60 cm demonstrated by the blue and green box plots, respectively. The TRE without Pb glass at tracker-to-target distance of ~110 cm (conventional setup) is shown by the gray box plot. b TRE measured as a function of tracker-to-target distance. A quadratic fit to the measurements is overlaid
