Vol 1, No 2 (2015)
- Year: 2015
- Articles: 6
- URL: https://jbpe.ssau.ru/index.php/JBPE/issue/view/127
Reviews
Tissue Optics and Photonics: Light-Tissue Interaction
Abstract
This is the second section of the review-tutorial paper describing fundamentals of tissue optics and photonics. As the first section of the paper was mostly devoted to description of biological tissue structures and their specificity related to interactions with light [1], this section 3 describes light-tissue interactions themselves that caused by tissue dispersion, scattering, and absorption properties, including light reflection and refraction, absorption, elastic, and quasi-elastic scattering. The major tissue absorbers and modes of elastic scattering, including Rayleigh and Mie scattering, will be presented.
Articles
Dendritic crystallogram images classification
Abstract
Zernike phase spatial filter for measuring the aberrations of the optical structures of the eye
Abstract
Compact optical tweezer with the capability of dynamic control
Abstract
Backscattering spectroscopy for assessing skin tumor
Abstract
The results of in vitro backscattering spectral studies of 7 nevuses and 27 samples of different skin cancer are presented. The pathology type classification in the two-dimensional phase space formed by the scattering indices at the wavelengths 560 nm, 650 nm, 700 nm, and 760 nm scaled to the healthy skin scattering coefficient value is proposed. It is shown that the sensitivity and specificity of differentiation between the benign and malignant tumors exceeds 86% and 96%, respectively, and their value for selecting melanoma among other malignant tumors falls by 5-8% due to partial overlap of classes in the phase space.
The combination of optical coherence tomography and Raman spectroscopy for tissue characterization
Abstract
The visualization as well as characterization of diseased tissue are of vital diagnostic interest for an early diagnosis to increase patients’ survival rate. In this study we introduce an imaging device combining optical coherence tomography (OCT) and Raman spectroscopy (RS), allowing to record 2D and 3D OCT cross sectional images of bulk tissue samples, as well as the acquisition of Raman spectra from small areas of interest in order to aid the detection process with molecular information. The design of the OCT/RS imaging device consists of commercially available cage components. The probe head involves a CCD camera chip for visualization purposes and galvanic mirrors for scanning the sample in x and y directions with a scan line rate up to 76 kHz. The OCT/RS imaging approach has been successfully evaluated by investigating pork samples. OCT and Raman data were correlated and different tissue types within the samples were successfully identified and clustered separately. Finally, pork skin samples with visual defects were characterized. Overall, the presented OCT/RS device allows for recording of large morphological overview OCT images to define points of interest, which are afterwards characterized in more detail on a molecular level by means of Raman spectroscopy.