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
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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DOI：
10.1117/1.jbo.23.6.060501
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发表时间：
2018-06-01
影响因子：
3.5
通讯作者：
Fried, Daniel
中科院分区：
文献类型：
--
作者：
Chan, Kenneth H.;Fried, Daniel
从可见光到近红外（NIR），随着波长的增加，釉质散射系数显著降低。然而，超过1300 nm，散射系数难以测量，并且不知道光散射是否在较长波长下继续显著降低。据推测，水的吸收是声音和脱矿釉质之间的对比度超过1300 nm的主要贡献者，因为在声音釉质中的深穿透光子可能被水吸收。在1450、1860、1880和1950 nm附近的波长处获得牙齿表面脱矿的反射图像。吸水量在1450和1880 nm处相似，但在1860、1880和1950 nm之间变化显着。病变对比度的多光谱比较提供了对在较长近红外波长下导致较高对比度的机制的深入了解。最高对比度在1950 nm处;然而，与1450 nm相比，1880 nm处的对比度明显更高，并且1860和1880 nm之间的对比度相似，这表明釉质散射系数在超过1300 nm时继续降低，并且健康釉质中减少的光散射是在较长NIR波长处较高病变对比度的主要原因。这对龋齿检测和诊断设备的波长选择具有重要影响，包括超过1300纳米的光学相干断层扫描的性能。(C)2018年，摄影光学仪器工程师协会（SPIE）
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. (C) 2018 Society of Photo-Optical Instrumentation Engineers (SPIE)