Application of colour magnification technique for revealing skin microcirculation changes under regional anaesthetic input

Rubīns, Uldis; Spīgulis, Jānis; Miscuks, Aleksejs

doi:10.1117/12.2044574

Cited by 9 publications

(8 citation statements)

References 2 publications

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“…Despite the fact that the brachial plexus blockade for upper-extremity surgery is a very common clinical procedure, 52 there are quite a few papers describing iPPG for anesthesia monitoring. 53,54 Our findings are consistent with results obtained in several studies utilizing LDI 55,56 and a thermal camera, 57 indicating increased perfusion during the brachial plexus block in both superficial dermal (iPPG 530 nm ) and deeper vascular layers (iPPG 810 nm ). The data are consistent with early findings, which state that a block of sympathetic nerves is associated with a sudden drop of peripheral sympathetic (vasoconstrictor) nerve activity, 58 thereby leading to vasodilation, increased blood flow, and increase in tissue/skin temperature.…”

Section: Regional Anesthesia Testsupporting

confidence: 90%

Imaging photoplethysmography for clinical assessment of cutaneous microcirculation at two different depths

et al. 2016

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The feasibility of bispectral imaging photoplethysmography (iPPG) system for clinical assessment of cutaneous microcirculation at two different depths is proposed. The iPPG system has been developed and evaluated for in vivo conditions during various tests: (1) topical application of vasodilatory liniment on the skin, (2) skin local heating, (3) arterial occlusion, and (4) regional anesthesia. The device has been validated by the measurements of a laser Doppler imager (LDI) as a reference. The hardware comprises four bispectral light sources (530 and 810 nm) for uniform illumination of skin, video camera, and the control unit for triggering of the system. The PPG signals were calculated and the changes of perfusion index (PI) were obtained during the tests. The results showed convincing correlations for PI obtained by iPPG530 nm and LDI at (1) topical liniment (r = 0.98) and (2) heating (r = 0.98) tests. The topical liniment and local heating tests revealed good selectivity of the system for superficial microcirculation monitoring. It is confirmed that the iPPG system could be used for assessment of cutaneous perfusion at two different depths, morphologically and functionally different vascular networks, and thus utilized in clinics as a cost-effective alternative to the LDI.

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Section: Regional Anesthesia Testsupporting

confidence: 90%

Imaging photoplethysmography for clinical assessment of cutaneous microcirculation at two different depths

et al. 2016

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“…The amplitude of PPG peaks may differ between the image pixels due to different blood perfusion of the skin tissues—especially if there is a burn or other dermal skin damage. After the image processing, parametric maps of the PPG signal amplitude distribution (or blood perfusion maps) can be constructed [ 44 ].…”

Section: Methodsmentioning

confidence: 99%

Multispectral, Fluorescent and Photoplethysmographic Imaging for Remote Skin Assessment

Spīgulis

2017

Sensors

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Optical tissue imaging has several advantages over the routine clinical imaging methods, including non-invasiveness (it does not change the structure of tissues), remote operation (it avoids infections) and the ability to quantify the tissue condition by means of specific image parameters. Dermatologists and other skin experts need compact (preferably pocket-size), self-sustaining and easy-to-use imaging devices. The operational principles and designs of ten portable in-vivo skin imaging prototypes developed at the Biophotonics Laboratory of Institute of Atomic Physics and Spectroscopy, University of Latvia during the recent five years are presented in this paper. Four groups of imaging devices are considered. Multi-spectral imagers offer possibilities for distant mapping of specific skin parameters, thus facilitating better diagnostics of skin malformations. Autofluorescence intensity and photobleaching rate imagers show a promising potential for skin tumor identification and margin delineation. Photoplethysmography video-imagers ensure remote detection of cutaneous blood pulsations and can provide real-time information on cardiovascular parameters and anesthesia efficiency. Multimodal skin imagers perform several of the abovementioned functions by taking a number of spectral and video images with the same image sensor. Design details of the developed prototypes and results of clinical tests illustrating their functionality are presented and discussed.

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“…EVM may also have significant potential in diagnostic and monitoring in medical applications. Most medical applications depend on the recovery of temporal features using the capabilities of colour amplification of EVM, such as measuring vital signs without touching patients [10,[20][21][22][23][24][25][26][27] and revealing otitis media in infants [28].…”

Section: Introductionmentioning

confidence: 99%

Eulerian video magnification: a review

Shahadi

Albattat

Al-allaq

et al. 2020

IJEECS

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<p>Many important subtle changes in the environment are invisible to the naked human eyes. These subtle changes occur because of colour variations, such as blood flow in a human face that leads to face colour change, or motion variations, such as vena movement under human skin and vibration of buildings. The human eye requires optical microscopes to detect these variations. Alternatively, new technologies, such as high-speed imagery and computer processing, can be used to detect these variations. These computerised microscopes depend on computation rather than optical amplification to amplify subtle colour and motion changes in videos. The most popular technique to achieve computation-based microscope is the Eulerian video magnification (EVM). However, several challenges in EVM still need to be solved to meet the requirements of real time and video quality. This paper presents a comprehensive study of EVM methods and reviews the related literature. The strengths and drawbacks of existing works are discussed, and the important research fields and challenges in the area of EVM are concluded.</p>

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Application of colour magnification technique for revealing skin microcirculation changes under regional anaesthetic input

Cited by 9 publications

References 2 publications

Imaging photoplethysmography for clinical assessment of cutaneous microcirculation at two different depths

Imaging photoplethysmography for clinical assessment of cutaneous microcirculation at two different depths

Multispectral, Fluorescent and Photoplethysmographic Imaging for Remote Skin Assessment

Eulerian video magnification: a review

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