Results 211 to 220 of about 24,406 (238)
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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 ...
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Fingertip photoplethysmography and migraine
Journal of the Neurological Sciences, 2003Whether migraine is accompanied by generalized disturbance of arteries throughout the body remains unclear. The second derivative of the fingertip photoplethysmography waveform (SDPTG) is now considered a useful tool for evaluating peripheral circulation.
Kan-ichiro, Komatsu +2 more
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Vaginal photoplethysmography: Methodological considerations
Archives of Sexual Behavior, 1979Methodological considerations related to the use of vaginal photoplethysmography in the experimental investigation of physiological sexual arousal in women are discussed. Specific topics covered include the operation and use of the device, methods of data reduction and analysis, and the role of vaginal photoplethysmography in the study of female sexual
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Multi-Channel Facial Photoplethysmography Sensing
2020 42nd Annual International Conference of the IEEE Engineering in Medicine & Biology Society (EMBC), 2020Motivated by the need for continuous cardiovascular monitoring, we present a system for performing photoplethysmography sensing at multiple facial locations. As a proof-of-concept, our system incorporates an optical sensor array into a wearable face mask form factor for application in a surgical hemodynamic monitoring use case. Here we demonstrate that
Parker S, Ruth +5 more
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Noninvasive Monitoring by Photoplethysmography
Clinics in Perinatology, 2012The photoplethysmogram (PPG) is a noninvasive circulatory signal related to the pulsatile volume in tissue and is displayed by many pulse oximeters. The PPG is similar in appearance to the invasive arterial waveform, but is noninvasive and ubiquitous in hospitals.
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