Characterization of blood flow rate in dental pulp by speckle patterns of backscattered light from an in vivo tooth
| Autor: | Alexander Smirnov, Vladimir V. Barun, Alex S. Terekh, Sergey K. Dick, Mehrnush M. Salimi Zadeh, Galina G. Chistyakova |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Diffuse reflectance infrared fourier transform Biomedical Engineering Hemodynamics Biomaterials Speckle pattern symbols.namesake Optics stomatognathic system Dentin medicine Humans Dental Pulp Enamel paint Fourier Analysis business.industry Optical Imaging Signal Processing Computer-Assisted Blood flow Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials stomatognathic diseases medicine.anatomical_structure Fourier analysis Regional Blood Flow visual_art visual_art.visual_art_medium symbols Pulp (tooth) business Tooth |
| Zdroj: | Journal of biomedical optics. 19(10) |
| ISSN: | 1560-2281 |
| Popis: | Experimental data on the hemodynamics of dental pulp at different stages of caries treatment are given. Observations of speckle patterns in backscattered laser light are used as a measurement method to qualitatively characterize changes in blood flow rate through the dental pulp. The measurements were made by the author-designed experimental setup. Theoretical estimations showed that stationary reflected light from an in vivo tooth contains a negligibly small information body on changes in the pulpal blood flow due to the shadowing of the pulp by optically thick enamel and dentin. Therefore, the temporal variations in the speckle patterns are the only possible way that can provide monitoring of blood conditions in the pulp by using backscattered light. Various statistical characteristics of the random reflected light fields are studied as indicators of blood flow rate changes. There were selected five statistical parameters of backscattered speckle images that give self-consistent data on these changes. The parameters include four combinations of integrals of the Fourier transforms of the observed temporal variations as well as the speckle image contrast. The selected parameters are shown to qualitatively agree with general considerations on the effects of reduced or increased blood flow rates on the selected integral quantities. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|