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[3-D navigation in the petrous bone with submillimeter accuracy].

F Kral1, W Freysinger

  • 1Klinische Abteilung für allgemeine Hals-, Nasen- und Ohrenerkrankungen der Universitätsklinik für Hals-, Nasen- und Ohrenheilkunde.

HNO
|April 7, 2004
PubMed
Summary

Computer-aided navigation in the petrous bone achieves submillimeter accuracy using high-resolution CT imaging and specialized referencing. This technology is suitable for sensitive surgical applications in the petrous bone and cerebellopontine angle.

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Area of Science:

  • Neurosurgery
  • Medical Imaging
  • Computer-Aided Surgery

Background:

  • Evaluating submillimeter accuracy for computer-aided navigation in the petrous bone.
  • Utilized a Zeiss STN intraoperative navigation system for approximately 3,000 measurements on an anatomic specimen.
  • Enabled direct measurement of normally inaccessible petrous bone structures.

Purpose of the Study:

  • To assess the accuracy of intraoperative 3-D navigation in the petrous bone.
  • To determine optimal imaging and referencing techniques for precise surgical guidance.

Main Methods:

  • Employed multislice CT imaging with 0.5 mm slice thickness and direct radiologic imaging.
  • Utilized an extrinsic marker structure (VBH-referencing element) for patient-to-image referencing.

Related Experiment Videos

  • Compared results with and without additional surface registration from the navigation system.

    • Main Results:

    • Best accuracy achieved with high-resolution CT (0.5 mm slice spacing), direct imaging, and extrinsic referencing.
    • An absolute positioning difference of 0.42+/-0.69 mm was observed in optimal conditions.
    • Additional surface registration did not improve the achieved accuracy.

    Conclusions:

    • Intraoperative 3-D navigation demonstrates satisfactory accuracy for clinical application in the petrous bone and cerebellopontine angle.
    • The technology is viable even with restricted patient areas for referencing.
    • This navigation approach is suitable for highly sensitive anatomical regions.