Method for Vertical Calibration of Laser-Projection Transnasal Fiberoptic High-Speed Videoendoscopy.
Hamzeh Ghasemzadeh, Dimitar D Deliyski, David S Ford and 3 others
PMID 31151853WHAT IT FOUND
A new calibration method allows a laser-projection endoscope to measure vertical vocal fold movement with 1.7% to 4.7% error.
Accuracy is highest when the scope is close to the tissue, but this is a technical validation, not a clinical trial.
Key findings
01The system measures absolute vertical distance with a mean percent error between 1.7% and 4.7%, depending on the working distance.
02Measurement accuracy is significantly better at shorter working distances (under 20 mm) compared to larger distances.
03Excluding the laser points on the top row of the projection pattern considerably reduces estimation error.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
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What it does not show
The study was conducted entirely on a flat, artificial target surface, not on human vocal folds. The system has not been tested for its ability to track laser points on moving, irregular, or reflective biological tissue (in-vivo). This is a technical engineering report, not a clinical trial; it does not demonstrate that the device improves patient care or diagnosis. Horizontal calibration and the segmentation algorithms for patient data were not included in this study.
The easy way to misread this
Do not assume this device is ready for clinical use or that it has been proven to improve voice assessment. The study only validates the mathematical calibration of the instrument on a static target, not its performance on human patients.