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Proceedings Paper

Phantom-based evaluation method for surgical assistance devices in minimally invasive cochlear implantation
Author(s): G. Jakob Lexow; Marcel Kluge; Omid Majdani; Thomas Lenarz; Thomas S. Rau
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Paper Abstract

Several research groups have proposed individual solutions for surgical assistance devices to perform minimally invasive cochlear implantation. The main challenge is the drilling of a small bore hole from the surface of the skull to the inner ear at submillimetric accuracy. Each group tested the accuracy of their device in their respective test bench or in a small number of temporal bone specimens. This complicates the comparison of the different approaches. Thus, a simple and inexpensive phantom based evaluation method is proposed which resembles clinical conditions. The method is based on half-skull phantoms made of bone-substitute material – optionally equipped with an artificial skin replica to include skin incision within the evaluation procedure. Anatomical structures of the temporal bone derived from segmentations using clinical imaging data are registered into a computer tomographic scan of the skull phantom and used for the planning of the drill trajectory. Drilling is performed with the respective device under conditions close to the intraoperative setting. Evaluation of accuracy can either be performed through postoperative imaging or by means of added targets on the inside of the skull model. Two different targets are proposed: simple reference marks only for measuring the accuracy of the device and a target containing a scala tympani model for evaluation of the complete workflow including the insertion of the electrode carrier. Experiments using the presented method take place under reproducible conditions thus allowing the comparison of the different approaches. In addition, artificial phantoms are easier to obtain and handle than human specimens.

Paper Details

Date Published: 3 March 2017
PDF: 7 pages
Proc. SPIE 10135, Medical Imaging 2017: Image-Guided Procedures, Robotic Interventions, and Modeling, 101352N (3 March 2017); doi: 10.1117/12.2254381
Show Author Affiliations
G. Jakob Lexow, Medizinische Hochschule Hannover (Germany)
Marcel Kluge, Medizinische Hochschule Hannover (Germany)
Omid Majdani, Medizinische Hochschule Hannover (Germany)
Thomas Lenarz, Medizinische Hochschule Hannover (Germany)
Thomas S. Rau, Medizinische Hochschule Hannover (Germany)

Published in SPIE Proceedings Vol. 10135:
Medical Imaging 2017: Image-Guided Procedures, Robotic Interventions, and Modeling
Robert J. Webster III; Baowei Fei, Editor(s)

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