Wavelet analysis of laser speckle contrast reveals new feature space for transcranial assessment of cerebral blood flow

This work shows the application of LSCI for mapping the cerebral vessels of a laboratory animal, and also presents the time-frequency processing of the registered signal. Thus, we expand the capabilities of the existing LSCI approach and demonstrate spatial mapping of blood flow fluctuations

HEAVY METALS IN TSSIMLYANSKOYE WATER RESERVOIR

The anthropogenic provinces ahve been distinguished, the role of the hydrobionts in the accumulation of the heavy metals and their accumulations in the bottomset beds have been characterized, the balance calculations on the supply-evacuation of the heavy metals into the ecological system of the water reservoir have been performed. The ecological situation of the Tsimlyansky region has been studied, the recommendations on the decrease of the contamination in the Tsimlyanskoe water reservoir have been represented. The results are used in the research and educational process of the higher educational institutionAvailable from VNTIC / VNTIC - Scientific & Technical Information Centre of RussiaSIGLERURussian Federatio

Time–frequency analysis of laser speckle contrast for transcranial assessment of cerebral blood flow

Improving noninvasive approaches to monitoring blood microcirculation is an urgent topic in modern biomedical engineering. One of the actively developing methods is laser speckle contrast imaging (LSCI), which allows not only the visualization of microvessels but also the quantitative measurements of microcirculatory blood flow. This work shows the application of LSCI for mapping the cerebral vessels of a laboratory animal, and also presents the time–frequency processing of the registered signal. Thus, we expand the capabilities of the existing LSCI approach and demonstrate spatial mapping of blood flow rhythms. The proposed technology makes it possible not only to measure the relative cerebral blood flow but also to expand diagnostic capabilities for a detailed analysis of the physiological mechanisms of changes in blood flow

Influence of melanin content on laser doppler flowmetry and tissue reflectance oximetry signal formation

The article presents the results of studies of the melanin effect on recorded signals in laser Doppler flowmetry (LDF) and tissue reflectance oximetry (TO). By investigating the properties of recorded microvascular blood flow and skin oxygenation signals, we have gained new knowledge about race-related differences in the formation of these signals. The effect of the skin melanin content on the intensity of the recorded signals in the LDF and TO methods was evaluated, and the limitations in the use of these methods in representatives of different ethnic groups were shown