A calibrated 3D dual-barrel otoendoscope based on fringe-projection profilometry

We demonstrate a calibration method for endoscopic three-dimensional shape measurement with cone beam projection. In this method, changes in the shape of the optical sectioning profiles are quantified and fitted while scanning a calibration board in the depth direction, using a cubic function. In accuracy tests using a flat plate and a ring reference gauge, the proposed method obtains an accuracy of 0.02 mm in the depth dimension and 0.09 mm in the radial dimension. These results represent 88% and 55% improvements compared to previous analysis. For medical applications, an ear examination simulator was employed, and our measurement results were compared to ground truth data obtained by microfocus X-ray computed tomography. The surface deviation of our method relative to the ground truth data was ±0.36mm during manual operation. A comparison of the measurement results before and after calibration revealed an improvement in the peak agreement with the ground truth data, with the deviation shifting from 0.2 mm to −0.05mm. Our strategy achieves a digital transformation of 3D endoscopy, which would benefit a number of medical fields.

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A calibrated 3D dual-barrel otoendoscope based on fringe-projection profilometry

Cited by 2 publications

References 38 publications

Morphometric Comparison of Tympanic Membrane in Unilateral Mucosal Chronic Otitis Media

Morphometric Comparison of Tympanic Membrane in Unilateral Mucosal Chronic Otitis Media

Calibration for endoscopic 3D shape measurement with cone beam projection

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