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A Monocular Variable Magnifications 3D Laparoscope System Using Double Liquid Lenses.

Fan Mao1, Tianqi Huang1, Longfei Ma1

  • 1Department of Biomedical EngineeringSchool of MedicineTsinghua University Beijing 100084 China.

IEEE Journal of Translational Engineering in Health and Medicine
|December 7, 2023
PubMed
Summary

This study introduces a novel laparoscopic system using double liquid lenses for variable magnification and real-time 3D reconstruction. The system enhances surgical depth perception and lesion visualization during minimally invasive surgery (MIS).

Keywords:
3D reconstructionDeep learning networkdepth from defocus (DFD)laparoscopeminimal invasive surgery (MIS)

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Area of Science:

  • Medical Imaging
  • Surgical Technology
  • Computer Vision

Background:

  • Minimally invasive surgery (MIS) lacks 3D perception due to single-view laparoscopes.
  • Existing depth reconstruction methods often require modified optics or complex setups.
  • Current systems struggle with variable magnification and real-time 3D reconstruction.

Purpose of the Study:

  • To develop a portable laparoscopic system for real-time monocular 3D reconstruction with variable magnification.
  • To enhance depth perception and visualization during MIS procedures.
  • To overcome limitations of conventional laparoscopes in providing 3D views and adaptable magnification.

Main Methods:

  • A novel optical structure with double liquid lenses for auto-magnification and autofocus without moving parts.
  • A deep learning network employing Depth from Defocus (DFD) for depth estimation from variable focal lengths.
  • Integration of the optical system with conventional laparoscopes for enhanced functionality.

Main Results:

  • Achieved a zoom rate of 0.68-1.44x with real-time depth estimation at 6fps.
  • Monocular 3D reconstruction accuracy of at least 6mm.
  • Provided clear visualization at close working distances (under 1mm).

Conclusions:

  • The developed system offers variable magnification and real-time 3D depth perception for laparoscopy.
  • It improves lesion detection and size diagnosis by providing magnified, clear views.
  • The portable design allows integration with existing laparoscopic instruments, enhancing surgical capabilities.