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首页> 外文期刊>Journal of biomedical optics >Multispectral cross-polarization reflectance measurements suggest high contrast of demineralization on tooth surfaces at wavelengths beyond 1300 nm due to reduced light scattering in sound enamel
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Multispectral cross-polarization reflectance measurements suggest high contrast of demineralization on tooth surfaces at wavelengths beyond 1300 nm due to reduced light scattering in sound enamel

机译：多光谱交叉极化反射率测量表明，由于减少了声音搪瓷中的光散射，因此在波长超过1300 nm时，牙齿表面的脱矿物质具有高对比度

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摘要

The enamel scattering coefficient decreases markedly with increasing wavelength from the visible to the near-infrared (NIR). However, beyond 1300 nm, the scattering coefficient is difficult to measure, and it is not known whether light scattering continues to decrease significantly at longer wavelengths. It is hypothesized that water absorption is a major contributor to the contrast between sound and demineralized enamel beyond 1300 nm since deeply penetrating photons in sound enamel are likely absorbed by water. Reflectance images of demineralization on tooth surfaces were acquired at wavelengths near 1450, 1860, 1880, and 1950 nm. The magnitude of water absorption is similar at 1450 and 1880 nm but varies markedly between 1860, 1880, and 1950 nm. Multispectral comparisons of lesion contrast provide insight into the mechanism responsible for higher contrast at longer NIR wavelengths. The highest contrast was at 1950 nm; however, the markedly higher contrast at 1880 compared to 1450 nm and similar contrast between 1860 and 1880 nm suggests that the enamel scattering coefficient continues to decrease beyond 1300 nm, and that reduced light scattering in sound enamel is most responsible for the higher lesion contrast at longer NIR wavelengths. This has important implications for the choice of wavelengths for caries detection and diagnostic devices, including the performance of optical coherence tomography beyond 1300 nm.
机译：从可见光到近红外（NIR）的波长增加，搪瓷散射系数显着降低。然而，超过1300nm时，散射系数难以测量，并且不知道在较长波长下光散射是否继续显着降低。据推测，吸水率是超过1300 nm的声音与脱矿质搪瓷之间对比度的主要因素，因为声音搪瓷中的深穿透光子很可能会被水吸收。在接近1450、1860、1880和1950 nm的波长下获取牙齿表面脱盐的反射图像。吸水量在1450和1880 nm处相似，但在1860、1880和1950 nm之间有明显变化。病变对比的多光谱比较提供了深入了解在更长NIR波长产生更高对比的机理的见解。最高的对比度是在1950 nm。然而，在1880年与1450 nm相比明显更高的对比度以及在1860和1880 nm之间相似的对比度表明釉质的散射系数继续降低到1300 nm以上，而声音釉质中光散射的减少是造成更高的病变对比度的主要原因。更长的NIR波长。这对龋齿检测和诊断设备的波长选择具有重要意义，包括超过1300 nm的光学相干层析成像性能。

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