Results 201 to 210 of about 11,400 (246)
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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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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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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
John P Hatch
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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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Photoplethysmography detection by smartphone's videocamera
Proceedings of the 6th IEEE International Conference on Intelligent Data Acquisition and Advanced Computing Systems, 2011Smartphone's video cameras become more and more powerful while the devices itself become used by many people. That allows utilizing them for many every-day tasks. One of such suitable application of the widely used smartphones is monitoring the state of the health.
Domenico Grimaldi +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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VitalCamSet - a dataset for Photoplethysmography Imaging
2019 IEEE Sensors Applications Symposium (SAS), 2019In recent years, several approaches for Photoplethysmography Imaging have been proposed. However, the so far proposed approaches have been evaluated either on non-public datasets or on such proposed for different research scope. Therefore, we present VitalCamSet, a new dataset for PPGI allowing comparative evaluation of different algorithmic approaches.
Timon Bloecher +4 more
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ROI Selection for Remote Photoplethysmography
2013Camera-based remote photoplethysmography (rPPG) is a technique that can be used to measure vital signs contactlessly. In order to optimize the extraction of photoplethysmographic signals from video sequences, we investigate the spatial dependence of the photoplethysmographic signal.
Georg Lempe +4 more
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An adaptive delineator for photoplethysmography waveforms
Biomedical Engineering / Biomedizinische Technik, 2016AbstractPhotoplethysmography (PPG) waveforms are rich in cardiovascular information, and hence, their analysis is significant in the diagnosis and prevention of cardiovascular diseases (CVDs). The second derivative of photoplethysmography (SDPPG) analysis for the accurate detection of significant points in characterising the PPG waveform is challenging.
Mohanalakshmi, Soundararajan +2 more
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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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