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Related Experiment Video

Updated: Jun 5, 2026

Technical Approach for Infrared Tracking for Soft Tissue Navigation with a Holographic Head-Mounted Display and Preclinical Validation
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Target and trajectory clinical application accuracy in neuronavigation.

Reuben R Shamir1, Leo Joskowicz, Sergey Spektor

  • 1School of Engineering and Computer Science, The Hebrew University, Jerusalem, Israel.

Neurosurgery
|January 6, 2011
PubMed
Summary
This summary is machine-generated.

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Ommaya catheter navigation accuracy varies significantly, with target errors differing from trajectory errors. Navigation system error reports should be used cautiously in neurosurgery.

Area of Science:

  • Neurosurgery
  • Medical Imaging
  • Surgical Navigation

Background:

  • Misplacement of neurosurgical instruments like catheters, needles, and electrodes can lead to poor outcomes and serious complications.
  • Accurate placement is critical for effective treatment in navigated neurosurgery.

Purpose of the Study:

  • To evaluate the accuracy of Ommaya ventricular catheter localization.
  • Assess accuracy both along the planned surgical trajectory and at the final target.

Main Methods:

  • Localization errors for Ommaya catheter insertion were measured in 15 patients using a commercial neuronavigation system.
  • Preoperative and postoperative imaging were used to compare planned trajectories with actual catheter positions.
  • Localization errors were compared against the navigation system's reported error.

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Last Updated: Jun 5, 2026

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Main Results:

  • Mean localization error at the target was 5.9 ± 4.3 mm, and at the entry point was 3.3 ± 1.9 mm.
  • Mean trajectory deviation was 1.6 ± 1.9 mm in shift and 3.9 ± 4.7° in angle.
  • The navigation system's reported error did not consistently reflect actual trajectory and target localization errors.

Conclusions:

  • Significant variations exist in Ommaya catheter localization accuracy along the trajectory and at the target.
  • Trajectory and target errors can differ substantially.
  • Relying solely on the navigation system's reported error for risk assessment is not advisable.