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Objective; to choose the optical clearing agent with the best illuminating ability in the long-wave UV spectrum used in phototherapy. Material and methods. Ex vivo skin samples were used as objects of study. Measurement of the total transmission spectra of the skin sections was carried out on a multi-channel spectrometer Ocean Optics QE 65000 (Ocean Optics, USA) using 4 optical clearing agents (40% glucose solution, glycerol, propylene glycol, oleic acid). Results. Having conducted a comparative analysis of ex vivo data collected from spectroscopy of these optical clearing agents at a wavelength of 370 nm, it was found that the maximum optical clearing was achieved using propylene glycol at 44 minutes, which was 11.56%. Conclusion. The use of optical clearing agents is possible not only to improve the visualization of the skin structure, but also to explore the dynamics of light transmission in long-wave UV A-1 therapy of patients.

Goal: to examine the effectiveness of use low coherent reflectometry method for diagnostic purposes in clinical dermatology. Materials and methods. For measurements optical coherence tomography OCS1300SS (Thorlab, USA) with swiped frequency was used. 12 patients with different skin diseases were studied (psoriasis, acne, scleroderma, etc.). Results. Distinct border was detected between layers with different optical characteristics (and structure) at a depth of 1000 m to 2000 microns for majority of the samples studied. It is important to note that a good regerneration of distribution of the interference signal during transmission from one section to another and close to an exponential decay of signal with an increase in depth of probing. Conclusion. As a criterion of pathological changes,may be proposed the degree of spatial uniformity in distribution decay constant of interference signal in depth obtained with help of low coherent reflectometry (in vivo).

Aim: working out the methods of visualization of information obtained during optical coherent tomography in normal skin and in series of inflammatory disorders. Materials and Methods. OCS1300SS (made in Thorlabs, USA) was used in which the source of emission of radiation was a super-luminiscent diode with mean wavelength of 1325 nm. 12 patients with different skin conditions and 5 virtually healthy volunteers were examined with ОСТ procedure in OPD and IPD settings. High resolution USG numerical system DUB (TPM GmbH, Germany) was used for comparative USG assessment. Results. ОСТ demonstrated considerably more detailed picture of the objects scanned compared to USG investigation. Image obtained with the help of ОСТ contains vital information about sizes of macro-morphological elements, status of vascular elements and their density in different depths of the skin. Conclusion. Additional results obtained from ОСТ of the skin lesions in plane section improves attraction for ОСТ in practical dermatology.

The study aims the development and evaluation of the effectiveness of tissues polarization probe in vitro conditions. The method is based on local estimation of polarization parameters of forward scattered radiation. Matherials and methods. Widely accepted technique of skin surface stripping with adhesive materials was used in this work. We used stereomicroscope "MC-2 ZOOM", ОСТ "The OCS1300SS" and polarimeter "THORLABS TXP 5004" to receive information about stratum corneum of normal and diseased skin (psoriasis, lichen planus, discoid lupus erythematosus, alopecia, scabies, demodex)

Method of the epidermal surface biopsy (ESB) with the adhesive compositions is the alter-native to the classic his-tological examination. Materials and Methods. In this study medical adhesive "Sulfacrylate" was used, small portions of which had been spread on an object glass, and then on different skin areas. To study the structural organization of the samples ESB the technique of optical coherence tomography (ОСТ) was used. Results. We obtained the pictures that visualize the structural organization of the different layers of the epidermis in lichen planus, hyperkeratosis, scabies and other skin diseases. Conclusion. This technique allows non-invasive measurement of high-precision structure of different layers of the epidermis, which can be useful both for research and for the practical dermatology.

Asymptotic behavior of temporal autocorrelation functions of speckle intensity fluctuations induced by tissue scanning with a focused probe beam is experimentally studied for the transition from a single-scattering to a multiple-scattering mode. Such parameters as the exponential factor (or the Hurst coefficient) and the Hausdorff dimension are proposed for the characterization and the visualization of the variations of the studied tissues' optical properties in generalized form. We studied reversible transition between various scattering modes stimulated by the application of certain chemical agents to the human sclera samples using speckle intensity correlation analysis; corresponding results are presented. The possibilities of the scattering structures imaging with local estimations of the exponential factor of speckle intensity fluctuations are shown in in vitro experiments with samples of human skin epidermis.

We analyze the influence of a weak phase modulation of multiply scattered partially coherent light fields on the variance of fluctuations of the scattered field intensity. It is suggested to perform diagnostics of scattering media by analyzing the probing radiation scattered from a “modulating” medium and determining the speckle intensity index (or contrast ratio) upon introduction of an object studied into the scheme of measurements. The proposed method is experimentally verified on model scattering media. © 2003 MAIK “Nauka / Interperiodica”. [ABSTRACT FROM AUTHOR]