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Updated: Jan 17, 2026

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Accurate 3D reconstruction of eardrum perforations using Structure from Motion photogrammetry.

Jeremy S Ruthberg1, Nicole Gunderson2, Lindsay Boven3

  • 1Department of Otolaryngology: Head and Neck Surgery, University of Washington, Seattle, WA, USA.

International Journal of Pediatric Otorhinolaryngology
|September 23, 2025
PubMed
Summary

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This summary is machine-generated.

Structure from Motion (SfM) photogrammetry accurately reconstructs eardrum perforations using endoscopy. This technique offers precise measurements for clinical applications like surgical planning and graft design.

Area of Science:

  • Otolaryngology
  • Medical Imaging
  • Computer Vision

Background:

  • Accurate measurement of tympanic membrane perforations is crucial for diagnosis and surgical planning.
  • Traditional methods for measuring perforations can be subjective and lack precision.
  • 3D reconstruction offers a potential solution for objective and detailed analysis.

Purpose of the Study:

  • To evaluate the accuracy of Structure from Motion (SfM) photogrammetry for 3D reconstruction of eardrum perforations.
  • To assess the feasibility of using routine endoscopy and SfM for measuring perforations in 3D-printed models and a human patient.

Main Methods:

  • Created 13 3D-printed ear models with perforations of known sizes (0.7-4.0 mm).
  • Captured endoscopic videos of perforations using a rigid endoscope and high-definition camera.
Keywords:
3D reconstructionComputer visionEndoscopic ear surgerySurgical planningTympanoplasty

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  • Utilized SfM photogrammetry to generate 3D point clouds for measurement, comparing results with microCT scans and 3D-printed models as ground truths.

    • Main Results:

    • SfM measurements showed an average absolute difference of 0.09 mm and a percentage error < 11% compared to microCT.
    • Bland-Altman analysis indicated no significant bias between measurements of large and small perforations.
    • In a live patient, SfM measurements deviated approximately 6% from manual ruler measurements.

    Conclusions:

    • SfM photogrammetry provides highly accurate 3D reconstructions of eardrum perforations.
    • The technique demonstrates clinical viability for objective measurements in otologic examinations.
    • Potential applications include surgical planning and patient-specific graft design for eardrum repair.