Dr. Masahiro Okada Profile

Dr. Masahiro Okada

at Okayama Univ

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Proceedings Article | 20 September 2023 Paper

Mid-infrared passive spectroscopic imaging for visualizing tooth hardness

So Yamashita, Yusuke Morimoto, Masahiro Okada, Takuya Matsumoto, Ichiro Ishimaru

Proceedings Volume 12608, 126080C (2023) https://doi.org/10.1117/12.3007507

KEYWORDS: Teeth, Imaging spectroscopy, Spectroscopy, Mid-IR, Visualization, Dental caries, Vibration, Spectroscopes, Crystals, Information visualization

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The objective of this study is to visualize tooth hardness by mid-infrared passive spectroscopic imaging with an imaging type 2D Fourier spectrometer. Radiated light in the mid-infrared region (wavelength of approximately 10 μm) is radiated from the surface of an object with a radiation intensity that depends on the temperature of the object. Our proposed device has a multi-slit grating that prevents the cancellation of bright spots. The multi-slit grating enables an inexpensive uncooled microbolometer array sensor to acquire two-dimensional spectral information from the radiated light of the measured target without external irradiation. Because the intrinsic vibration of the molecule itself is detected in this case, the spectral characteristics are the radiation spectra due to the intrinsic vibration peak. Wavelengths that can be confirmed as absorption in active spectroscopy can be confirmed as radiation in passive spectroscopy, resulting in a negative-positive relationship. First, we measured bovine teeth with our spectrometer. A radiation peak assigned to hydroxyapatite, the main component of teeth, was detected. Next, to obtain the relationship between the tooth hardness and spectrum, the micro-Vickers hardness of the tooth surface was measured. By peak deconvolution, we found a negative correlation between the hardness and peak area ratio of the crystalline and amorphous hydroxyapatite phases. The results of this study will be used in the future for non-invasive and simple risk prediction of caries formation.

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