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Showing 1 to 20 of 35 for “"photoplethysmography"”.
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The estimation of indirect blood pressure using photoplethysmography
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1981.
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Reflectance photoplethysmography for non-invasive monitoring of tissue perfusion
… techniques have been developed over the decades. Photoplethysmography (PPG) is an optical technique that measures blood volume variations in vascular tissue and it is well known for its utilisation in pulse oximetry for the estimation of arterial blood oxygen saturation (SpO2). In pulse oximetry, …
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An investigation of remote non-contact photoplethysmography and pulse oximetry
… of non-contact remote pulse oximetry and photoplethysmography. A thorough description is given of the technique of pulse oximetry along with some physiological effects and some characteristics of light-tissue interaction that underlie pulse oximetry. A device is then described that is …
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A Robust Algorithm for Identification of Motion Artifacts in Photoplethysmography Signals
Photoplethysmography(PPG) is commonly used as a means of continuous health monitoring. Many clinically relevant parameters like heart rate (HR), blood oxygenaton level (SPO2) are derived from the sensor measurements using PPG. Presence of motion artifacts in the signal decreases the accuracy of …
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A wearable blood pressure sensor using oscillometric photoplethysmography and micro accelerometers
… and validated. A solid, coin-sized cuff-less photoplethysmography (PPG) sensor worn over a palpable artery is utilized to measure arterial blood pressure. Measurements are obtained through a modified oscillometric technique which eliminates the need for a high pressure cuff and instead, takes …
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Investigations of photoplethysmography in the assessment of haemodynamics, vascular mechanics and haemorheology
… hypothesis is to show for the first time that Photoplethysmography (PPG) has the potential to non‐invasively assess, in a qualifying and quantifying manner, the above parameters. Positives outcomes from such approach will establish the potential of the PPG as a preferential monitoring …
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Photoplethysmography for non-invasive measurement of bone hemodynamic responses to changes in external pressure
… long duration human spaceflight. Developments in photoplethysmography (PPG) hardware have made it a promising tool for non-invasive bone hemodynamic measurements. The aims of this thesis are to: 1) validate the use of PPG as a tool for non-invasive bone hemodynamic measurements, 2) characterize …
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Intra-operative optical monitoring of bowel tissue viability based on photoplethysmography and laser doppler flowmetry
… techniques, laser Doppler flowmetry (LDF) and Photoplethysmography (PPG), into one probe intended for assessment of perfusion in abdominal tissue during bowel resection intraoperatively. In PPG, changes in transmission of light through tissue due to pulsation of small arteries can be monitored …
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Affective state recognition in Virtual Reality from electromyography and photoplethysmography using head-mounted wearable sensors.
The three core components of Affective Computing (AC) are emotion expression recognition, emotion processing, and emotional feedback. Affective states are typically characterized in a two-dimensional space consisting of arousal, i.e., the intensity of the emotion felt; and valence, i.e., the degree …
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Design and development of a low cost heart best monitor device using finger photoplethysmography technique :|bcircuit design and fabrication of a non-invasive heart beat monitoring device that employs reflectance and transmission mode photoplethysmography using parallel port interface and microcontroller PIC16F84A.
… in this thesis. An optical technique called “Photoplethysmography” is utilized by attaching to the base of the finger for monitoring beat to beat pulsation. Two major design issues addressed in this research is to achieve a strong and accurate PPG signal and simultaneously minimizing …
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Design and analysis of fingernail sensors for measurement of fingertip touch fouce and finger posture
… the fingernail, a technique termed "reflectance photoplethysmography." By arranging the LEDs and photodetectors in a spatial array, the two-dimensional pattern of blood volume can be measured and used to predict the touch force and posture. This thesis first underscores the role of the fingernail …
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Motion Artifact Reduction in Impedance Plethysmography Signal
… artifact from the electrocardiogram (ECG) and photoplethysmography (PPG) signals in the past few years. However, no such study exists for the Impedance Plethysmography (IP) signal. The IP signal can be used to monitor respiration in mobile devices. However, it is very susceptible to motion …
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Detecting Human Memory Processes via Bio-Signals
Bio signals, such as eye movement data, photoplethysmography (PPG), and electrodermal activity (EDA), can provide insight into various cognitive states. Previous work has shown that eye movements along with other bio-signals differ when viewing familiar versus unfamiliar faces. Signals such as …
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Investigation of splanchnic perfusion utilising an intraluminal opto-electronic sensor placed in the duodenum
… the feasibility of using the technique of photoplethysmography intraluminally in the duodenum in order to measure the haemodynamic changes occurring in the splanchnic circulation in a minimally invasive fashion. A bespoke processing system and data acquisition virtual instrument were …
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Motion artifact cancellation for wearable photoplethysmographic sensor
Photoplethysmography (PPG) is a non-invasive and unobtrusive technique to measure heart rate from the surface of the skin, by exposing a section of the skin to an LED light and measuring the changes in reflected light due to the blood pulsing through under the skin. However, PPG signals are highly …
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Design and analysis of artifact-resistive finger photoplethysmographic sensors for vital sign monitoring
… mathematical model describing the finger photoplethysmography was developed and verified by finite element method, numerical simulation and experiments. Total power consumption is analyzed in relation to the characteristics of the individual components, sampling rate, and CPU clock speed. …
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Wearable Devices for Improved Equine Welfare
… terms and (2) evaluate the accuracy of a photoplethysmography based pulse sensor to detect heart rates of adult horses. In addition, currently marketed equine wearable sensors are reviewed, and their limitations are evaluated. Areas of future research and developments of equine wearable …
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Camera-based Recovery of Cardiovascular Signals from Unconstrained Face Videos Using an Attention Network
… module into the overall imaging-based photoplethysmography (iPPG) framework. We present extensive experimental results using the challenging UBFC-Phys dataset and the well-known COHFACE dataset. The source code is available at https://github.com/yogeshd21/CVPM-2023-iPPG-Paper.
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An algorithm for extracting the PPG Baseline Drift in real-time
Photoplethysmography is an optical technique for measuring the perfusion of blood in skin and tissue arterial vessels. Due to its simplicity, accessibility and abundance of information on an individual’s cardiovascular system, it has been a pervasive topic of research within recent years. With …
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Exploring the Potential of Earables for Personal-Scale Sensing
… microphones (facing in-the-ear-canal); (iii) photoplethysmography sensors (PPG). Data collected by earables augmented with these sensors in and around the ear may enable several personal-scale sensing applications such as augmented/virtual reality, improved navigation, medical rehabilitation, …
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