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Related Experiment Video

Updated: Aug 23, 2025

Probe-based Confocal Laser Endomicroscopy of the Urinary Tract: The Technique
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[Confocal probe localization algorithm based on region growing and endoscope size prior].

Yuying Liu1, Yifan Wang1, Siyang Zuo1

  • 1School of Mechanical Engineering, Tianjin University, Tianjin 300350, P. R. China.

Sheng Wu Yi Xue Gong Cheng Xue Za Zhi = Journal of Biomedical Engineering = Shengwu Yixue Gongchengxue Zazhi
|October 31, 2022
PubMed
Summary

A new algorithm precisely locates confocal probes for real-time optical biopsy site identification. This advancement improves intraoperative diagnosis by accurately pinpointing the confocal probe tip, enhancing surgical precision.

Keywords:
Confocal probe localizationEndoscope size priorRegion growing

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Last Updated: Aug 23, 2025

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Area of Science:

  • Medical imaging
  • Surgical technology
  • Computational geometry

Context:

  • Confocal laser endomicroscopy (CLE) provides real-time, in situ, cell-level imaging for intraoperative diagnosis.
  • The non-invasive nature of CLE poses challenges in accurately relocating the optical biopsy site.
  • Precise localization of the CLE probe tip is crucial for repeatable optical biopsies.

Purpose:

  • To develop a robust confocal probe localization algorithm for accurate 3D coordinate calculation.
  • To overcome the limitations of existing methods, such as reliance on color information and susceptibility to illumination variations.
  • To address the scale uncertainty inherent in monocular camera systems for 3D reconstruction.

Summary:

  • A novel algorithm utilizes region growing on probe edge images to detect the probe region.
  • It identifies tip points using a probe axis and iterative optimization, incorporating endoscope size prior information.
  • This method calculates the 3D coordinates of the probe tip, solving scale uncertainty and improving robustness.

Impact:

  • The algorithm demonstrates robust accuracy and speed, independent of probe color and illumination conditions.
  • Achieves low pixel error (11.76 pixels) and average relative position error (1.66 mm) within a 5 cm probe extension range.
  • Enables real-time and accurate localization of the confocal probe, significantly enhancing intraoperative diagnostic capabilities.