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"Navigation accuracy was approximately 1.0 mm, which is sufficient for functional endoscopic sinus surgery," test results indicated. "C-arm motion in between calibration and registration slightly degraded the registration accuracy by approximately 0.3 mm."
"Standard deviations of each of the transformations were in the range 0.15-0.31 mm," published data showed. "In the cadaver experiment, the navigation images were considered in good correspondence with the endoscopic images by an experienced ENT surgeon."
"Availability of 3D localization information provided by the navigation system was considered valuable by the ENT surgeon," the researchers concluded.
van de Kraats and colleagues published their study in Physics in Medicine and Biology (Direct navigation on 3D rotational x-ray data acquired with a mobile propeller C-arm: accuracy and application in functional endoscopic sinus surgery. Phys Med Biol, 2005;50(24):5769-5781).
For additional information, contact E.B. van de Kraats, University of Utrecht Medical Center, Image Sciences Institute, Utrecht, the Netherlands.