Application of the adaptive wavelet transform for analysis of blood flow oscillations in the human skin

Tankanag, Arina V.; Chemeris, N. K.

doi:10.1088/0031-9155/53/21/005

Cited by 54 publications

(33 citation statements)

References 24 publications

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“…Spectral analysis of LDF signals obtained was performed with continuous adaptive wavelet transform 22 To define anesthesia effects on the amplitudes of low frequency components of LDF signals we calculated relative amplitudes as the ratio of average amplitude within examined interval and average amplitude obtained over the entire frequency range. 2 The statistical analysis was carried out with SigmaPlot 11.0 software (Systat Software, Inc., USA).…”

Section: Discussionmentioning

confidence: 99%

Anesthesia effects on the low frequency blood flow oscillations in mouse skin

Astashev

Serov

Tankanag

2018

Skin Research and Technology

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Section: Discussionmentioning

confidence: 99%

Anesthesia effects on the low frequency blood flow oscillations in mouse skin

Astashev

Serov

Tankanag

2018

Skin Research and Technology

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“…2). Only dependencies for artery and peripheral artery were subsequently picked for spectral content analysis by adaptive wavelet transform [18].…”

Section: Peripheral Arterymentioning

confidence: 99%

Роль Гидродинамических Параметров В Формировании Низкочастотных Колебаний Артериального Давления У Человека

Grinevich¹

2016

Math.Biol.Bioinf.

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Abstract. The mechanism of forming of low-frequency oscillations in the human cardiovascular system is a burning issue today. The current paper considers a hypothesis of hydrodynamic nature of these oscillations, which are formed without the involvement of autonomous control of the cardiovascular system from the autonomic nervous system. The developed reduced hydrodynamic model was used to study the system response on additive periodic perturbation of wide-ranged frequencies that affects the performance of the heart pump, as well as the role of hydrodynamic parameters of the cardiovascular bed in this process. It was shown that low-frequency perturbation of pump wall rigidity forms low-frequency oscillations in the arterial part of the cardiovascular flow without autonomous control, with the maximum amplitude observed at frequency close to 0.1 Hz.

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“…Wavelet analysis was performed using an Adaptive Wavelet Transform (AWT) proposed to be used for blood flow oscillation analysis by Tankanag et al to minimize the edge effect inherent to the continuous wavelet transform [9]. The continuous wavelet transform is shown in Eq.…”

Section: Time-frequency Analysismentioning

confidence: 99%

Time-Frequency Analysis of Skin Temperature in a Patient with a Surface Tumor Monitored with Infrared Imaging

Liu¹,

Meyer²,

Dementyev³

et al. 2010

Proceedings of the 2010 International Conference on Quantitative InfraRed Thermography

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Infrared thermography was used to assess skin temperature in a patient with a surface tumor across a range of frequencies relating to blood flow fluctuations. Using a high acquisition rate of image capture and wavelet analysis we were able to study temperature dynamics from low frequencies related to vasomotion (~0.01 Hz) up to the cardiac rate (~1 Hz). We show that IR imaging can be used to monitor skin temperature in spatial, time, and time-frequency domains allowing the study of coupling between different microvascular territories. IntroductionBlood flow in the microcirculation can often be assessed by use of optical imaging techniques such as Laser Doppler and Laser Speckle. These techniques allow for frequency analysis of blood flow fluctuations across a spectrum of frequencies that are related to NO-independent endothelial activity (Range V: 0.005 -0.0095 Hz), NO-dependent endothelial activity (Range VI: 0.0095 -0.021 Hz), neurogenic (sympathetic) activity (Range IV: 0.021 -0.052 Hz), myogenic activity (Range III: 0.052 -0.145 Hz), respiration (Range II: 0.145 -0.6 Hz), and heart rate (Range 1: 0.6 -2 Hz) [1]. Use of frequency analysis techniques allows the study of the contribution of each physiological component to the overall local blood flow regulation. Previously, skin temperature has also been used to study these components, but the low-pass filter characteristics of the skin attenuate higher frequency temperature changes. Bandrivskyy et al. measured skin temperature with thermistors along with simultaneous laser Doppler measurements and used Wavelet Phase Coherence (WPC) to show the effects of blood flow on skin temperature up to the 0.1 Hz range, at which point skin temperature oscillations contributed to blood flow are masked by noise [2]. Infrared (IR) imaging reflects skin temperature through radiation following conduction and convection of heat to the surface of the skin, but does not rely on inertia such as a thermistor. Therefore, with IR measurement it is possible to assess the temperature of living tissue at more depth than the surface. Because of this there is an expectation that IR imaging would allow the analysis of lower and higher frequencies through the skin. Gorbach et al. used IR imaging to study blood flow oscillations in the kidney using wavelet analysis [4], and during intraoperative monitoring of human brain with an IR camera heart rate in individual vessel segments on the cortex was monitored [5]. Garbey et al. measured the cardiac pulse using IR through the skin, with the consequence of filtering out low frequency oscillations relating to blood flow [3].Tumor microvasculature is known to be atypical in structure as well as function. The exact nature of vascular abnormalities that may be present in a specific tumor at a specific stage is not well known, but may include increased angiogenesis, non-specific flow directions, and stagnant flow [6]. These differences in structure and function can diminish blood flow regulation in tumors and lead to decreased effectiveness of...

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Application of the adaptive wavelet transform for analysis of blood flow oscillations in the human skin

Cited by 54 publications

References 24 publications

Anesthesia effects on the low frequency blood flow oscillations in mouse skin

Anesthesia effects on the low frequency blood flow oscillations in mouse skin

Роль Гидродинамических Параметров В Формировании Низкочастотных Колебаний Артериального Давления У Человека

Time-Frequency Analysis of Skin Temperature in a Patient with a Surface Tumor Monitored with Infrared Imaging

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