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Related Experiment Video

Updated: Jun 19, 2026

Robotized Testing of Camera Positions to Determine Ideal Configuration for Stereo 3D Visualization of Open-Heart Surgery
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Stereoscopic calibration for augmented reality visualization in microscopic surgery.

Trishia El Chemaly1,2,3, Caio Athayde Neves4,5, Christoph Leuze6,7

  • 1Department of Bioengineering, Stanford University, Stanford, CA, USA. tchemaly@stanford.edu.

International Journal of Computer Assisted Radiology and Surgery
|July 14, 2023
PubMed
Summary
This summary is machine-generated.

This study developed an augmented reality (AR) system for ear surgery, integrating real-time 3D CT scans with microscope views. The system achieved high accuracy, enhancing surgical visualization and depth perception for improved safety.

Keywords:
Augmented realityCamera calibrationElectromagnetic trackingOtologic surgeryStereo microscope

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Area of Science:

  • Neurosurgery
  • Medical Imaging
  • Surgical Technology

Background:

  • Middle and inner ear surgeries address hearing loss, infections, and tumors.
  • Current procedures face challenges due to limited visual and haptic feedback.
  • Augmented reality (AR) offers potential for improved surgical safety via 3D visualization.

Purpose of the Study:

  • To develop a real-time computed tomography (CT)-augmented stereo microscope system.
  • To utilize camera calibration and electromagnetic (EM) tracking for AR integration.
  • To enhance visualization during middle and inner ear surgeries.

Main Methods:

  • A 3D printed, electromagnetically tracked calibration board was used for stereo microscope calibration.
  • Intrinsic and extrinsic parameters were computed to map EM tracker data to microscope images.
  • A 3D CT-derived model of a temporal bone was overlaid onto the microscope feed.

Main Results:

  • The system achieved a registration error (RE) of 0.11 ± 0.06 mm in 2D and 0.98 ± 0.13 mm in 3D.
  • A 3D CT model was successfully overlaid onto a 3D printed temporal bone model.
  • The system demonstrated low latency and good registration accuracy in a laboratory setting.

Conclusions:

  • An electromagnetically tracked surgical stereo microscope system for AR visualization was successfully calibrated.
  • The calibration method provides accuracy suitable for otologic procedures.
  • AR enhances surgical field visualization and depth perception, potentially improving operative outcomes.