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Related Experiment Videos

Contact-less stylus for surgical navigation: registration without digitization.

Elvis C S Chen1, Burton Ma2, Terry M Peters3

  • 1Robarts Research Institute, Western University, London, ON, Canada. chene@robarts.ca.

International Journal of Computer Assisted Radiology and Surgery
|April 8, 2017
PubMed
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A new laser-based stylus offers accurate, contact-less fiducial registration for surgical navigation. This system achieves precise localization without direct contact, simplifying the digitization process.

Area of Science:

  • Medical Imaging
  • Surgical Navigation
  • Biomedical Engineering

Background:

  • Fiducial registration is crucial for accurate surgical navigation.
  • Current methods often require physical contact, posing challenges in sterile environments.
  • Developing contact-less solutions can enhance safety and efficiency in surgical procedures.

Purpose of the Study:

  • To introduce a novel laser-based, contact-less stylus for surgical navigation.
  • To enable accurate fiducial registration and digitization without physical contact.
  • To evaluate the performance of this system in a surgical context.

Main Methods:

  • Augmenting a laser pointer with a spatial measurement device for 3D fiducial localization.
  • Developing a calibration method for the laser beam's orientation.
Keywords:
CalibrationFiducial localization errorNavigationPoint-to-lineProcrustesRegistrationSurgical guidanceTarget registration error

Related Experiment Videos

  • Formulating fiducial digitization as a line intersection problem and registration as a point-to-line problem.

    • Main Results:

    • Achieved a Root Mean Square (RMS) fiducial localization error of 0.63 mm.
    • Demonstrated mean Target Registration Error (TRE) below 1.5 mm for lumbar vertebra surface digitization.
    • Found that while contact-based registration performed slightly better under ideal conditions, the contact-less system offers significant advantages.

    Conclusions:

    • An inexpensive, contact-less stylus can achieve accurate fiducial registration.
    • The developed method allows for registration without explicit fiducial digitization.
    • This technology holds promise for improving surgical navigation accuracy and workflow.