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Image sharpening improves the visibility of reference points on low-dose lateral cephalometric radiographs: a phantom
Ikuho Kojima1,2, Arata Ito3, Yusuke Shimada1
1Department of Dental Informatics and Radiology, Tohoku University Graduate School of Dentistry, 4-1 Seiryo-machi, Aoba-ku, Sendai, Miyagi 980-8575, Japan.
Dento Maxillo Facial Radiology
|July 6, 2026
Summary
A novel image-sharpening technique enhances reference point visibility on low-dose cephalometric radiographs. This non-AI approach shows promise for reducing radiation exposure in dental imaging.
Area of Science:
- Dentistry
- Radiology
- Medical Imaging
Background:
- Low-dose imaging in cephalometric radiography is desirable to reduce radiation exposure.
- Visibility of anatomical reference points can be compromised at lower radiation doses.
Purpose of the Study:
- To evaluate a non-artificial intelligence image-sharpening method for improving reference point visibility on low-dose lateral cephalometric radiographs.
Main Methods:
- Lateral cephalometric radiographs were acquired from a human bone phantom at full dose and reduced doses (60%, 40%, 20%).
- Low-dose images were processed using a two-level image-sharpening software.
- Six reviewers assessed reference point visibility, with results analyzed using odds ratios.
Main Results:
- Mildly sharpened 60% dose images showed comparable or better visibility for most reference points than full-dose images.
- Markedly sharpened images demonstrated significantly improved visibility at 60% and 40% doses for all points, and at 20% for several points.
Conclusions:
- Image-sharpening algorithms effectively enhance reference point visibility on low-dose cephalometric radiographs.
- This post-acquisition technique offers technical feasibility for dose-reduced cephalometric imaging.
