Results 201 to 210 of about 24,907 (232)
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Photoplethysmography and nociception
Acta Anaesthesiologica Scandinavica, 2009Photoplethysmography (PPG), i.e. pulse oximetric wave, is a non‐invasive technique that is used in anaesthesia monitoring primarily to monitor blood oxygenation. The PPG waveform resembles that of the arterial blood pressure but instead of pressure it is related to the volume changes in the measurement site and hence contains information related to the
I, Korhonen, A, Yli-Hankala
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Best Practice & Research Clinical Anaesthesiology, 2014
The photoplethysmographic (PPG) waveform, also known as the pulse oximeter waveform, is one of the most commonly displayed clinical waveforms. First described in the 1930s, the technology behind the waveform is simple. The waveform, as displayed on the modern pulse oximeter, is an amplified and highly filtered measurement of light absorption by the ...
Aymen A, Alian, Kirk H, Shelley
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The photoplethysmographic (PPG) waveform, also known as the pulse oximeter waveform, is one of the most commonly displayed clinical waveforms. First described in the 1930s, the technology behind the waveform is simple. The waveform, as displayed on the modern pulse oximeter, is an amplified and highly filtered measurement of light absorption by the ...
Aymen A, Alian, Kirk H, Shelley
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Multilaser photoplethysmography technique
Lasers in Medical Science, 2007New technique for parallel recording of reflection photoplethysmography signals in broad spectral band (violet to NIR) has been developed based on fiber-coupled laser irradiation and time-resolved spectrometric detection. Differences in photoplethysmography waveforms that were recorded simultaneously at different wavelengths confirmed the depth variety
L, Gailite, J, Spigulis, A, Lihachev
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Medical & Biological Engineering & Computing, 1991
Photoplethysmography (PPG) and laser Doppler flowmetry (LDF) were compared and evaluated. The comparison was accomplished considering differences in physical principles and geometrical and optical conditions. Changes in human skin perfusion were induced by cold and hot water provocation on limited areas of the finger and the forearm. The results showed
L G, Lindberg, T, Tamura, P A, Oberg
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Photoplethysmography (PPG) and laser Doppler flowmetry (LDF) were compared and evaluated. The comparison was accomplished considering differences in physical principles and geometrical and optical conditions. Changes in human skin perfusion were induced by cold and hot water provocation on limited areas of the finger and the forearm. The results showed
L G, Lindberg, T, Tamura, P A, Oberg
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Skin photoplethysmography — a review
Computer Methods and Programs in Biomedicine, 1989The photoplethysmograph has been used for over 50 years but there are still misconceptions in how and what is the information obtained. A photoplethysmograph signal from any site on the skin can be separated into an oscillating (a.c.) and a steady-state (d.c.) component, their amplitudes dependent upon the structure and flow in the vascular bed.
A A, Kamal +3 more
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Imaging-photoplethysmography-guided optical microangiography
Optics Letters, 2022We report a method to image facial cutaneous microvascular perfusion using wide-field imaging photoplethysmography (iPPG) and handheld swept-source optical coherence tomography (OCT). The iPPG system employs a 16-bit-depth camera to provide a 2D wide-field blood pulsation map that is then used as a positioning guidance for OCT imaging of cutaneous ...
Qinghua He, Ruikang K. Wang
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Artifact reduction in photoplethysmography
Applied Optics, 1998Motion artifact reduction in photoplethysmography, and therefore by implication in pulse oximetry, is achieved with a novel nonlinear methodology. The physical origins of the photoplethysmographic signals are explored in relation to a nonlinear measure of the observed intensity fluctuations.
M J, Hayes, P R, Smith
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Stochastic Modeling for Photoplethysmography Compression
2020 42nd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC), 2020Photoplethysmography (PPG) has been widely involved in health monitoring for clinical medicine and wearable devices. To make full use of PPG signals for diagnosis and health care, raw PPG waveforms have to be stored and transmitted in a storage and power-efficient way, which is data compression.
Ke, Xu +3 more
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Psychophysiology, 1974
ABSTRACTEvidence is provided showing that there is very little change in pulse volume in the ear lobe as a function of the usual types of psychological stimuli. On the one hand, this makes ear lobe plethysmography an excellent source of a signal to trigger a cardiotachometer for investigators interested in pulse rate who do not want to, or cannot, use ...
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ABSTRACTEvidence is provided showing that there is very little change in pulse volume in the ear lobe as a function of the usual types of psychological stimuli. On the one hand, this makes ear lobe plethysmography an excellent source of a signal to trigger a cardiotachometer for investigators interested in pulse rate who do not want to, or cannot, use ...
openaire +2 more sources