نتایج جستجو برای: photoplethysmography

تعداد نتایج: 1059  

Journal: :Nanotechnology 2010
A Kleine A Baumgartner J Trbovic D S Golubev A D Zaikin C Schönenberger

Crossed Andreev reflection (CAR) in metallic nanostructures, a possible basis for solid-state electron entangler devices, is usually investigated by detecting non-local voltages in multi-terminal superconductor/normal metal devices. This task is difficult because other subgap processes may mask the effects of CAR. One of these processes is the generation of charge imbalance (CI) and the diffusi...

2016
P. A. Kyriacou K. Shafqat S. K. Pal

Photoplethysmography is a non-invasive electro-optical technique widely used in the study and monitoring of the pulsations associated with changes in blood volume in a peripheral vascular bed. Photoplethysmography is used in the estimation of arterial oxygen saturation (SpO2) by pulse oximetry. A reflectance finger photoplethysmographic (PPG) probe and a multiplexed data acquisition system oper...

Journal: :Proceedings of the ... AAAI Conference on Artificial Intelligence 2023

Remote photoplethysmography (rPPG) enables non-contact heart rate (HR) estimation from facial videos which gives significant convenience compared with traditional contact-based measurements. In the real-world long-term health monitoring scenario, distance of participants and their head movements usually vary by time, resulting in inaccurate rPPG measurement due to varying face resolution comple...

Journal: :Hypertension 2014
Julio A Chirinos Ernst R Rietzschel Prithvi Shiva-Kumar Marc L De Buyzere Payman Zamani Tom Claessens Salvatore Geraci Prasad Konda Dirk De Bacquer Scott R Akers Thierry C Gillebert Patrick Segers

Effective arterial elastance (E(A)) was proposed as a lumped parameter that incorporates pulsatile and resistive afterload and is increasingly being used in clinical studies. Theoretical modeling studies suggest that E(A) is minimally affected by pulsatile load, but little human data are available. We assessed the relationship between E(A) and arterial load determined noninvasively from central...

Journal: :BioMedical Engineering OnLine 2009
Meir Nitzan Amikam Patron Zehava Glik Abraham T Weiss

BACKGROUND Automatic measurement of arterial blood pressure is important, but the available commercial automatic blood pressure meters, mostly based on oscillometry, are of low accuracy. METHODS In this study, we present a cuff-based technique for automatic measurement of systolic blood pressure, based on photoplethysmographic signals measured simultaneously in fingers of both hands. After in...

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