Results 51 to 60 of about 7,588 (202)
Empirical retinal venous pulse wave velocity using modified photoplethysmography
BMC Research Notes, 2023 Objective Using the novel imaging method of high-speed modified photoplethysmography we measured the retinal venous pulse wave velocity in a single case. Results A healthy 30-year-old subject underwent high-speed modified photoplethysmography (120 frames
Anmar Abdul-Rahman +5 more
doaj +1 more source
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
openaire +2 more sources
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
core +1 more source
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.
core +1 more source
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
core +1 more source
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
doaj +1 more source
Estimating Carotid Pulse and Breathing Rate from Near-infrared Video of the Neck
, 2018 Objective: Non-contact physiological measurement is a growing research area that allows capturing vital signs such as heart rate (HR) and breathing rate (BR) comfortably and unobtrusively with remote devices.
Chen, Weixuan +2 more
core +1 more source
A Review of Atrial Fibrillation Detection Methods as a Service [PDF]
, 2020 Atrial Fibrillation (AF) is a common heart arrhythmia that often goes undetected, and even if it is detected, managing the condition may be challenging. In this paper, we review how the RR interval and Electrocardiogram (ECG) signals, incorporated into a
Acharya, U. Rajendra +2 more
core +1 more source
Advanced Science, EarlyView.A real‐time, non‐contact photoplethysmography (PPG) system based on InAs colloidal quantum dots (CQDs) synthesized via a seedless injection synthesis is demonstrated. The measured oxygen saturation shows considerable agreement with commercial PPG devices.
Beom Kwan Kim +8 more
wiley +1 more source
A Reproducible Study on Remote Heart Rate Measurement [PDF]
, 2017 This paper studies the problem of reproducible research in remote photoplethysmography (rPPG). Most of the work published in this domain is assessed on privately-owned databases, making it difficult to evaluate proposed algorithms in a standard and ...
Anjos, André +2 more
core +1 more source