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Related Experiment Video

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Calibration for endoscopic 3D shape measurement with cone beam projection.

Yuta Takahashi, Takeshi Higashiguchi, Toshitaka Wakayama

    Applied Optics
    |June 10, 2024
    PubMed
    Summary
    This summary is machine-generated.

    This study presents a new calibration method for endoscopic 3D shape measurement using cone beam projection. The improved technique enhances accuracy for medical applications, offering significant advancements in 3D endoscopy.

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    Area of Science:

    • Medical Imaging
    • Optical Metrology
    • Endoscopic Technology

    Background:

    • Accurate 3D shape measurement is crucial for minimally invasive surgery and medical diagnostics.
    • Existing endoscopic measurement techniques face limitations in precision and depth perception.
    • Cone beam projection offers potential for enhanced 3D reconstruction in confined spaces.

    Purpose of the Study:

    • To develop and validate a novel calibration method for endoscopic 3D shape measurement using cone beam projection.
    • To quantify the accuracy improvements offered by the proposed calibration technique.
    • To assess the method's applicability and performance in a simulated medical environment.

    Main Methods:

    • A calibration method was developed involving quantifying and fitting optical sectioning profiles with a cubic function while scanning a calibration board.
    • Accuracy was tested using a flat plate and a ring reference gauge.
    • The method was evaluated on an ear examination simulator, comparing results to microfocus X-ray computed tomography (CT) ground truth data.

    Main Results:

    • The proposed method achieved an accuracy of 0.02 mm in depth and 0.09 mm in radial dimensions, representing 88% and 55% improvements over previous methods.
    • In medical simulations, the surface deviation from microfocus CT ground truth was ±0.36 mm.
    • Calibration improved peak agreement with ground truth, reducing deviation from 0.2 mm to -0.05 mm.

    Conclusions:

    • The developed calibration method significantly enhances the accuracy of endoscopic 3D shape measurement.
    • This technique offers a substantial improvement for 3D endoscopy, paving the way for digital transformation in various medical fields.
    • The method demonstrates high precision and reliability for medical applications, particularly in detailed anatomical examinations.