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Cortical surface tracking using a stereoscopic operating microscope.

Hai Sun1, David W Roberts, Hany Farid

  • 1Thayer School of Engineering, Dartmouth College, Hanover, New Hampshire, USA. hai.sun@dartmouth.edu

Neurosurgery
|April 1, 2005
PubMed
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This study introduces a stereo vision system to track brain surface deformation during neurosurgery, improving navigation accuracy. The system measures and compensates for tissue changes, enhancing surgical precision.

Area of Science:

  • Neurosurgery
  • Medical Imaging
  • Computer Vision

Background:

  • Image-guided neurosurgery relies on accurate preoperative imaging.
  • Soft tissue deformation during surgery can lead to navigational errors.
  • Compensating for intraoperative brain changes is crucial for surgical accuracy.

Purpose of the Study:

  • To develop and validate a novel approach for measuring and compensating for soft tissue deformation during image-guided neurosurgery.
  • To estimate the three-dimensional (3-D) topology of the cortical surface and track its motion in real-time.
  • To enhance the accuracy of neurosurgical navigation by accounting for intraoperative brain changes.

Main Methods:

  • A stereo imaging system, comprising two charge-coupled device cameras attached to an operating microscope, was utilized.

Related Experiment Videos

  • Stereopsis was employed to estimate the 3-D cortical topology from stereo image pairs.
  • The estimated 3-D cortical surface was registered to preoperative image volumes for navigational guidance, and its motion was tracked over time.

    • Main Results:

    • The 3-D cortical topology was estimated with an average error of less than 1.2 mm.
    • The system successfully tracked various types of cortical surface motion, including pulsatile movement, gravitational sag, and deformation due to intracranial pressure or tissue resection.
    • The 3-D surface estimation from 1024 x 768 resolution images required approximately 60 seconds of computation.

    Conclusions:

    • A stereo vision system integrated with an operating microscope can effectively estimate the dynamic topology of the cortical surface during surgery.
    • This technique allows for the coregistration of the intraoperatively estimated 3-D surface with preoperative image volumes.
    • The approach enhances neurosurgical navigation systems by compensating for brain deformation, thereby improving the accuracy of anatomic correspondence.