Abstract
Knowledge of the optical properties of biological tissues is important for the development of optical diagnostics, photodynamic and photothermal therapy of various diseases. However, despite the significant number of works devoted to the determination of the optical properties of tissues, the optical properties of human gums and dentin remain currently poorly understood. In this work, we experimentally studied the optical properties of human gums and dentin in the spectral range from 350 nm to 800 nm. Basing on measured diffuse reflection and total transmission spectra and using the Inverse Adding Doubling (IAD) method, the spectral dependences of absorption and scattering coefficients of the studied tissue samples were calculated.
Highlights
IntroductionThe scientific and technological progress of recent decades has taken medicine to a new higher level
We experimentally studied the optical properties of human gums and dentin in the spectral range from 350 nm to 800 nm
The gingival mucosa and dentin of a human tooth can be attributed to fibrous tissues, which are based on collagen and argyrophilic fibers and hemoglobins in the gums tissue
Summary
The scientific and technological progress of recent decades has taken medicine to a new higher level. Optical imaging modalities for the deep layers of tissues is used to differentiate malignant neoplasms in their early stages, including OCT, fluorescence and Raman spectroscopies, portable imaging systems based on fiber-optic technologies for delivering radiation to the pathological sites and back, and some other technologies [1, 3, 4]. One of the frequently used methods for calculating tissue scattering and absorption coefficients is the inverse addition-doubling (IAD) technique. It was developed by Dr Scott Prahl et al [5]. It is one of the most used algorithms for solution of inverse optical problem for reconstruction reduced (transport) scattering and absorption coefficients which is pretty fast and accurate. The IAD method is widely used for processing of the spectrophotometry data obtained with integrating spheres, including in vitro studies of pathologically altered mucous membrane of the human maxillary sinus in the spectral range of 350–2000 nm [6], sclera of the eye in the spectral range of 370–2500 nm [7], human eye lenses with various stages of cataract [8], peritoneal tissues in the spectral range of 350–2500 nm [9], human stomach mucosa in the spectral range of 400–2000 nm [10], human colon tissues in the spectral range 350–2500 [11], human colon mucosa and colon precancerous polyps in the spectral range of 400–1000 nm [12], and a rather large number of other tissues: skin, muscles, skull, etc. [1, 13, 14]
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