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Tooth Geometry-dependent Sensitivity Variations in L-band Electron Paramagnetic Resonance Tooth Dosimetry: A
Jeonghun Oh1, Chang Uk Koo1, Kwon Choi2
1Program in Biomedical Radiation Sciences, Department of Transdisciplinary Studies, Graduate School of Convergence Science and Technology, Seoul National University, Seoul 08826, Republic of Korea.
Health Physics
|October 2, 2025
Summary
L-band in vivo electron paramagnetic resonance (EPR) tooth dosimetry relies on tooth geometry. This study found labial enamel thickness, horizontal, and vertical curvature significantly impact EPR intensity, suggesting improved dosimetry methods are needed.
Area of Science:
- Medical Physics
- Biophysics
- Radiological Dosimetry
Background:
- L-band in vivo electron paramagnetic resonance (EPR) tooth dosimetry offers rapid, non-invasive radiation dose assessment.
- Tooth geometry and positioning are critical but poorly understood factors influencing EPR intensity.
- Current methods have limitations in triage dosimetry due to imperfect consideration of geometric variations.
Purpose of the Study:
- To individually analyze the impact of specific geometric parameters on EPR dosimetric sensitivity.
- To identify the dominant geometric factors affecting L-band in vivo EPR tooth dosimetry.
- To inform the development of more accurate geometric correction methods.
Main Methods:
- Finite element analysis and model-based parametric studies were conducted on five key geometric parameters: labial enamel thickness (τlab), enamel area (Aen), aspect ratio (RA), horizontal curvature (CH), and vertical curvature (CV).
- Micro-computed tomography (micro-CT) images from 12 human maxillary central incisors were used to investigate parameter distributions.
- A quasi-tooth model was developed to simulate tooth geometry and validate sensitivity variations against micro-CT derived models.
Main Results:
- EPR sensitivity showed a strong linear correlation with labial enamel thickness (τlab), horizontal curvature (CH), and vertical curvature (CV).
- Enamel area (Aen) exhibited a plateau effect around its average value, and aspect ratio (RA) showed no clear trend.
- Normalized analysis identified τlab, CH, and CV as primary drivers of sensitivity variation, with Aen and RA having lesser influence.
Conclusions:
- Labial enamel thickness, horizontal, and vertical curvature are the dominant geometric parameters influencing L-band in vivo EPR tooth dosimetry.
- Previous methods using enamel area for correction may have indirectly accounted for labial enamel thickness variations.
- An enhanced dosimetry method incorporating multiple geometric parameters is necessary for improved accuracy and reliability.
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