Technical Accuracy of a Neuronavigation System Measured with a High-precision Mechanical Micromanipulator
| Autor: | Ralf Steinmeier, Michael Kaus, Thomas Sporer, Rudolf Fahlbusch, Oliver Ganslandt |
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| Rok vydání: | 1997 |
| Předmět: |
Neuronavigation system
Accuracy and precision business.industry Neurosurgery Extrapolation Tripod (photography) Vibration law.invention Micromanipulation Optics Evaluation Studies as Topic law Position (vector) Therapy Computer-Assisted Image Processing Computer-Assisted Medicine Surgery Neurology (clinical) business Micromanipulator Reference frame |
| Zdroj: | Neurosurgery. 41:1431-1437 |
| ISSN: | 1524-4040 0148-396X |
| DOI: | 10.1097/00006123-199712000-00046 |
| Popis: | OBJECTIVE This study was designed to determine and evaluate the different system-inherent sources of erroneous target localization of a light-emitting diode (LED)-based neuronavigation system (StealthStation, Stealth Technologies, Boulder, CO). METHODS The localization accuracy was estimated by applying a high-precision mechanical micromanipulator to move and exactly locate (+/- 0.1 micron) the pointer at multiple positions in the physical three-dimensional space. The localization error was evaluated by calculating the spatial distance between the (known) LED positions and the LED coordinates measured by the neuronavigator. The results are based on a study of approximately 280,000 independent coordinate measurements. RESULTS The maximum localization error detected was 0.55 +/- 0.29 mm, with the z direction (distance to the camera array) being the most erroneous coordinate. Minimum localization error was found at a distance of 1400 mm from the central camera (optimal measurement position). Additional error due to 1) mechanical vibrations of the camera tripod (+/- 0.15 mm) and the reference frame (+/- 0.08 mm) and 2) extrapolation of the pointer tip position from the LED coordinates of at least +/- 0.12 mm were detected, leading to a total technical error of 0.55 +/- 0.64 mm. CONCLUSIONS Based on this technical accuracy analysis, a set of handling recommendations is proposed, leading to an improved localization accuracy. The localization error could be reduced by 0.3 +/- 0.15 mm by correct camera positioning (1400 mm distance) plus 0.15 mm by vibration-eliminating fixation of the camera. Correct handling of the probe during the operation may improve the accuracy by up to 0.1 mm. |
| Databáze: | OpenAIRE |
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