Technical Program

Paper Detail

Paper:	FR-PM-PS3.10
Session:	Image Guided Diagnosis, Surgery and Therapy
Time:	Friday, April 7, 13:30 - 14:50
Presentation:	Poster
Title:	Validation of a Fiducial Frame System for Image-Guided Otologic Surgery Utilizing BAHA® Bone Screws
Authors:	Ramya Balachandran; Vanderbilt University
	Robert F. Labadie; Vanderbilt University
	J. Michael Fitzpatrick; Vanderbilt University
Abstract:	Image-guided otologic surgeries performed on healthy patients require non-invasive fiducial systems that achieve submillimetric target registration error (TRE). We have described such a system that attaches repeatably to a subject via a dental bite block [1]. We now describe a new method for the clinical validation of such a system that can be conducted in the laboratory with no intraoperative data collection. The method relies on the participation of patients with bone-anchored hearing-aids (BAHA®), which require the implantation of a titanium screw behind the ear. By attaching a fiducial marker to this screw, we can measure TRE at the screw with high accuracy. From those measurements we can estimate TRE at other positions. Results of measurements on a cadaveric skull agree with a previous study that required the implantation of intracranial posts [9] and show that the system achieves submillimetric accuracy in the inner ear.

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