Abstract
Purpose
The accuracy achievable when utilizing image guidance depends to a large extent on the accuracy with which the patient can be registered to preoperative image data. This work proposes a method for the registration of the temporal bone based on surface matching and investigates the achievable accuracy of the technique.
Methods
Fourteen human temporal bones were utilized for evaluation; incisions were made, fiducial screws were implanted to act as a ground truth, and imaging was performed. The positions of the fiducials and surface of the mastoid were extracted from image data and reference positions defined at the round window and the mastoid surface. The surface of the bone was then digitized using a tracked pointer within the region exposed by the incisions and the physical and image point clouds registered, with the result compared to the fiducial-based registration.
Results
Results of one case were excluded due to a problem with the ground truth registration. In the remaining cases an accuracy of \(0.16\pm 0.09\) and \(0.23\pm 0.1\) mm was observed relative to the ground truth at the surface of the mastoid and round window, respectively.
Conclusions
A technique for the registration of the temporal bone was proposed, based on surface matching after exposure of the mastoid surface, and evaluated on human temporal bone specimens. The results reveal that high-accuracy patient-to-image registration is possible without the use of fiducial screws.
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Acknowledgments
This work was completed as part of the Nano-Tera initiative; the work was scientifically evaluated by the Swiss National Science Foundation, financed by the Swiss Confederation and funded by Nano-Tera.ch. The authors would like to acknowledge the Institute of Anatomy at the University of Bern for providing the temporal bone specimens. This work was also supported by National Natural Science Foundation of China (No.61190124, 61190120).
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Declaration of Helsinki and its later amendments or comparable ethical standards. This article does not contain any studies with animals performed by any of the authors.
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Informed consent was obtained from all individual participants included in the study.
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Zhou, C., Anschuetz, L., Weder, S. et al. Surface matching for high-accuracy registration of the lateral skull base. Int J CARS 11, 2097–2103 (2016). https://doi.org/10.1007/s11548-016-1394-3
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DOI: https://doi.org/10.1007/s11548-016-1394-3