Tressel John, Abdelaziz Marwa, Fried Daniel
University of California, San Francisco, San Francisco, CA 94143-0758.
Proc SPIE Int Soc Opt Eng. 2021 Mar;11627. doi: 10.1117/12.2584909. Epub 2021 Mar 5.
Changes in the reflectivity of lesions on the proximal surfaces of extracted human teeth were measured at SWIR wavelengths from 1300-2000 nm as they were dried with air to assess lesion activity. An extended range tungsten-halogen lamp with bandpass filters of varying wavelength (bandwidth) 1300 nm (90), 1460 nm (85), 1535 nm (80), and 1675 nm (90) along with a broadband ASE source centered near the peak of the water-absorption band at 1950-nm were used as light sources and an extended range InGaAs camera (1000-2340 nm) was used to acquire reflected light images as the samples were dried with air. MicroCT images were used as a gold standard for comparison. SWIR light at 1950 nm yields extremely high contrast of demineralization and appears to be the optimum wavelength for the assessment of lesion activity on tooth coronal surfaces.
在对拔除的人类牙齿近表面病变进行空气干燥时，于1300 - 2000 nm的短波红外（SWIR）波长下测量病变的反射率变化，以评估病变活性。使用了一个带有不同波长（带宽）的带通滤光片的扩展范围钨卤灯，波长分别为1300 nm（90）、1460 nm（85）、1535 nm（80）和1675 nm（90），以及一个以1950 nm水吸收带峰值附近为中心的宽带放大自发辐射（ASE）源作为光源，并使用一个扩展范围的铟镓砷（InGaAs）相机（1000 - 2340 nm）在样本进行空气干燥时采集反射光图像。微观计算机断层扫描（MicroCT）图像用作比较的金标准。1950 nm的SWIR光在脱矿方面产生极高的对比度，似乎是评估牙齿冠部表面病变活性的最佳波长。
