Results 41 to 50 of about 7,588 (215)
Improvements in Remote Cardiopulmonary Measurement Using a Five Band Digital Camera [PDF]
, 2014 Remote measurement of the blood volume pulse via photoplethysmography (PPG) using digital cameras and ambient light has great potential for healthcare and affective computing. However, traditional RGB cameras have limited frequency resolution. We present
Gontarek, Sarah +2 more
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Spatiotemporal processing in photoplethysmography for skin microcirculatory perfusion imaging
Biomedical Optics Express, 2022 Technological advances in the real-time visualization of cutaneous microcirculation aim to realize benefits including high-resolution imaging, suppressed noise, and robust temporal coherence. Photoplethysmography (PPG), a noninvasive technique that measures single or multiple points of relative blood volume changes in blood vessels under the skin ...
Dongkai, Cheng +3 more
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Hybrid Optical Unobtrusive Blood Pressure Measurements
Sensors, 2017 Blood pressure (BP) is critical in diagnosing certain cardiovascular diseases such as hypertension. Some previous studies have proved that BP can be estimated by pulse transit time (PTT) calculated by a pair of photoplethysmography (PPG) signals at two ...
Guangfei Zhang +4 more
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Noncontact imaging photoplethysmography to effectively access pulse rate variability [PDF]
Journal of Biomedical Optics, 2012 Noncontact imaging photoplethysmography (PPG) can provide physiological assessment at various anatomical locations with no discomfort to the patient. However, most previous imaging PPG (iPPG) systems have been limited by a low sample frequency, which restricts their use clinically, for instance, in the assessment of pulse rate variability (PRV). In the
Yu, Sun +4 more
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IEEE Access, 2023 Long-term wiring on a newborn patient could be a disguise scene for parents. Unobtrusive and reliable monitoring without wiring can be a euphoric alternative for newborns and parents in obstetrics and gynecology (OB/GYN) incubation rooms.
Yenming J. Chen +5 more
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In systemic sclerosis skin perfusion of hands is reduced and may predict the occurrence of new digital ulcers [PDF]
, 2017 Systemic sclerosis (SSc) patients are at high risk for the development of ischemic digital ulcers (DUs). The aim of this study was to assess in SSc patients a correlation between skin perfusion evaluated by LDPI and DUs and to evaluate the prognostic ...
Barbano, Biagio +6 more
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Contactless Monitoring of Microcirculation Reaction on Local Temperature Changes
Applied Sciences, 2019 Assessment of skin blood flow is an important clinical task which is required to study mechanisms of microcirculation regulation including thermoregulation.
Maxim A. Volynsky +3 more
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Contact Surface Area: A Novel Signal for Heart Rate Estimation in Smartphone Videos
, 2019 We consider the problem of smartphone video-based heart rate estimation, which typically relies on measuring the green color intensity of the user's skin.
Fridovich-Keil, Sara, Ramadge, Peter J.
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Heart Rate Extraction from Novel Neck Photoplethysmography Signals. [PDF]
, 2019 This paper demonstrates for the first time how heart rate (HR) can be extracted from novel neck photoplethysmography (PPG). A novel algorithm is presented, which when tested in neck PPG signals recorded from 9 subjects at different respiratory rates ...
Garcia-Lopez, I +2 more
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Current Directions in Biomedical Engineering, 2015 Videos of the human skin contain subtle color variations associated with the blood volume pulse. This remote photoplethysmography signal can be used for heart rate monitoring and represents an alternative to signals obtained from contact-based hardware ...
Spicher Nicolai +3 more
doaj +1 more source