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Comparative tracking error analysis of five different optical tracking systems.

R Khadem1, C C Yeh, M Sadeghi-Tehrani

  • 1Image Guidance Laboratories, Stanford University School of Medicine, CA 94305-5327, USA.

Computer Aided Surgery : Official Journal of the International Society for Computer Aided Surgery
|June 22, 2000
PubMed
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Optical tracking system precision, measured as jitter, is crucial for surgical navigation. Both FlashPoint and Polaris systems showed jitter under 0.11 mm, with accuracy depending on dynamic reference frame placement relative to the camera.

Area of Science:

  • Medical Imaging
  • Surgical Navigation Systems
  • Optical Tracking Technology

Background:

  • Effective surgical guidance relies on precise optical tracking systems (OTS).
  • Dynamic reference frame (DRF) placement relative to the camera impacts OTS accuracy.
  • Quantifying jitter is key to understanding OTS performance.

Purpose of the Study:

  • To evaluate the precision of optical tracking systems (OTS) by measuring jitter.
  • To determine how DRF position affects OTS measurement precision.
  • To compare the jitter performance of FlashPoint and Polaris OTS.

Main Methods:

  • Tested FlashPoint and Polaris OTS in five camera/DRF configurations.
  • Utilized a custom linear testing apparatus with software for data collection.

Related Experiment Videos

  • Measured jitter within a single quadrant of the camera viewing volume.

    • Main Results:

    • FlashPoint cameras exhibited RMS jitter ranging from 0.028 ± 0.012 mm to 0.059 ± 0.047 mm.
    • Polaris cameras showed RMS jitter of 0.058 ± 0.037 mm (active DRF) and 0.115 ± 0.075 mm (passive DRF).
    • Both systems demonstrated jitter below 0.11 mm, with differing error distributions.

    Conclusions:

    • Both FlashPoint and Polaris OTS meet precision requirements for surgical guidance.
    • Jitter is significantly influenced by the DRF's position along the camera's axis.
    • Understanding jitter is essential for optimizing DRF placement in image-based surgical navigation.