External Validity of Calibrated Measurements from a Laser-Projection Transnasal Fiberoptic High-Speed Videoendoscopy System.
Hamzeh Ghasemzadeh, Ali Imani Azad, Dimitar D Deliyski
PMID 35115223WHAT IT FOUND
Calibrated laryngeal measurements were less accurate when the scope was tilted or the surface was not flat.
Vertical error rose with angle, and horizontal error was higher on a 3D surface.
Key findings
01Tilting the endoscope increased calibrated vertical measurement error, and the effect was larger than the effect of working distance.
02Calibrated horizontal measurement error was higher from the 3D surface, while imaging angle did not significantly affect it.
03On the 3D surface, vertical error averaged around 6% and horizontal error averaged around 11% for most working distances.
STILL TO COME
How it was doneWhat they foundWhat it means for SLPs
Read the rest of this summary
You get three full summaries a month, free, and we do not ask for a card. Search, the TL;DRs and your library stay unlimited either way.
What it does not show
The study used benchtop targets and a 3D-printed surface, so it does not show accuracy under in-vivo conditions. The 3D surface error may be an upper bound because printing and registration added error. The tested tilt range was limited to 10° by the setup. Horizontal error comparisons used fixed locations on the flat surface but sampled the whole field of view on the 3D surface. The findings came from a specific endoscope design, so error magnitudes may differ for other systems.
The easy way to misread this
Do not treat the reported 6% and 11% error values as in-vivo accuracy. These values came from benchtop and 3D printed surfaces.