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Related Experiment Video

Updated: May 12, 2025

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A novel spatial-temporal image fusion method for augmented reality-based endoscopic surgery.

Haochen Shi1, Jiangchang Xu2, Haitao Li1

  • 1Institute of Biomedical Manufacturing and Life Quality Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200241, China.

Medical Image Analysis
|May 7, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a new spatial-temporal endoscope calibration method to improve augmented reality (AR) in endoscopic surgery. The novel approach accurately calibrates endoscopes, enhancing surgical navigation and patient safety.

Keywords:
Augmented realityCamera calibrationEndoscopeHand–eye calibrationLatency compensation

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Area of Science:

  • Medical Imaging
  • Surgical Navigation
  • Augmented Reality

Background:

  • Accurate endoscope calibration is crucial for augmented reality (AR) in endoscopic surgery.
  • Asynchrony between optical trackers and endoscopes causes augmented scene divergence, posing risks during surgery.

Purpose of the Study:

  • To propose a novel spatial-temporal endoscope calibration method.
  • To simultaneously determine spatial transformation and temporal latency between tracking and image acquisition.

Main Methods:

  • Utilized a Monte Carlo method with a large dataset to estimate intrinsic parameters and temporal latency.
  • Introduced latency as an independent variable in hand-eye calibration equation.
  • Developed a weighted iterative algorithm to solve the equation without a fixture.

Main Results:

  • Achieved average 2D error of 7±3 pixels and pseudo-3D error of 1.2±0.4mm in stable scenes.
  • Calibration time was 82.4±16.6 seconds, 68% faster than conventional methods.
  • Compensated for 11±2ms latency in dynamic scenes, 5.7 times faster than uncompensated methods.

Conclusions:

  • The proposed method enables quicker, fixture-free calibration through handheld movement.
  • Successfully validated in clinical trials for transnasal optic canal decompression surgery.
  • Has the potential to enhance safety and efficacy in endoscopic surgeries, improving patient outcomes.