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Dissertations / Theses on the topic 'Photoplethysmography'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Hayes, Matthew J. "Artefact reduction in photoplethysmography." Thesis, Loughborough University, 1998. https://dspace.lboro.ac.uk/2134/7094.

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The use of optical techniques in biomedical monitoring and diagnosis is becoming increasingly widespread, primarily because of the non-invasive nature of optically derived measurements. Physiological analysis is usually achieved by characterisation of the spectral or temporal properties of the interaction between light and the anatomy. Although some optical measurements require complex instrumentation and protocols, recent technological advances have resulted in robust and compact equipment that is now used routinely in a multitude of clinical contexts. Unfortunately, these measurements are in
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2

Shi, Ping. "Photoplethysmography in noninvasive cardiovascular assessment." Thesis, Loughborough University, 2009. https://dspace.lboro.ac.uk/2134/5399.

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The electro-optic technique of measuring the cardiovascular pulse wave known as photoplethysmography (PPG) is clinically utilised for noninvasive characterisation of physiological components by dynamic monitoring of tissue optical absorption. There has been a resurgence of interest in this technique in recent years, driven by the demand for a low cost, compact, simple and portable technology for primary care and community-based clinical settings, and the advancement of computer-based pulse wave analysis techniques. PPG signal provides a means of determining cardiovascular properties during the
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3

Cheang, Peck-Yeng (Sharon). "Feasibility of non-contact photoplethysmography." Thesis, Loughborough University, 2008. https://dspace.lboro.ac.uk/2134/34255.

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This thesis explores and investigates the feasibility of a non-contact photoplethysmography system operating in both transmission and reflection modes. Several issues are addressed in the implementation of the non-contact system, including the dynamic range of PPG signals, ambient artefacts and effects of direct coupling, which is light that is detected without any interaction with the measured tissue area. Plethysmography has been used in a range of biomedical applications to study blood volume changes. All current applications employ contact probes, where the transducers are positioned direc
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4

Zheng, Jia. "Opto-Physiological Modelling of Imaging Photoplethysmography." Thesis, Loughborough University, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.519660.

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5

Sun, Yu. "Imaging photoplethysmography : towards effective physiological measurements." Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/9143.

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Since its conception decades ago, Photoplethysmography (PPG) the non-invasive opto-electronic technique that measures arterial pulsations in-vivo has proven its worth by achieving and maintaining its rank as a compulsory standard of patient monitoring. However successful, conventional contact monitoring mode is not suitable in certain clinical and biomedical situations, e.g., in the case of skin damage, or when unconstrained movement is required. With the advance of computer and photonics technologies, there has been a resurgence of interest in PPG and one potential route to overcome the above
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6

Crabtree, Vincent P. "Non-invasive vascular assessment using photoplethysmography." Thesis, Loughborough University, 2003. https://dspace.lboro.ac.uk/2134/7752.

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Photoplethysmography (PPG) has become widely accepted as a valuable clinical tool for performing non-invasive biomedical monitoring. The dominant clinical application of PPG has been pulse oximetry, which uses spectral analysis of the peripheral blood supply to establish haemoglobin saturation. PPG has also found success in screening for venous dysfunction, though to a limited degree. Arterial Disease (AD) is a condition where blood flow in the arteries of the body is reduced,a condition known as ischaernia. Ischaernia can result in pain in the affected areas, such as chest pain for an ischear
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7

John, Gareth W. "Measurement of venous blood flow using photoplethysmography." Thesis, Cardiff University, 2005. http://orca.cf.ac.uk/54076/.

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This simple, non-invasive test will reduce the patient numbers requiring the more time-consuming ultrasound examination, by screening out a high proportion of individuals who definitely do not have lower limb DVT. However, further signal processing methods should be investigated to improve the specificity of the test.
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8

MacConachie, Middleton Paul. "Physiological and clinical implications of photoplethysmography waveforms." Thesis, Imperial College London, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.525237.

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9

Trumpp, Alexander, Johannes Lohr, Daniel Wedekind, et al. "Camera-based photoplethysmography in an intraoperative setting." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2018. http://nbn-resolving.de/urn:nbn:de:bsz:14-qucosa-234950.

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Background Camera-based photoplethysmography (cbPPG) is a measurement technique which enables remote vital sign monitoring by using cameras. To obtain valid plethysmograms, proper regions of interest (ROIs) have to be selected in the video data. Most automated selection methods rely on specific spatial or temporal features limiting a broader application. In this work, we present a new method which overcomes those drawbacks and, therefore, allows cbPPG to be applied in an intraoperative environment. Methods We recorded 41 patients during surgery using an RGB and a near-infrared (NIR) camera. A
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10

Butler, Matthew J. "Motion artefact reduction for reflection-mode photoplethysmography." Thesis, University of Nottingham, 2018. http://eprints.nottingham.ac.uk/52390/.

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Photoplethysmography (PPG) is a technique that uses light to measure the local changes in blood-volume in subjects (predominantly humans). Multiple useful statistics can be gained from such a measurement; heart-rate and it's variability, blood-oxygen saturation and even an estimation of blood pressure, to name but a few. Compared to other measurement techniques, photoplethysmography is favourable as it is both non-invasive, since nothing physical penetrates the subjects skin, and safe, as the subject is galvanically isolated from the test equipment (additional benefits also exist). Motion arte
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11

Allen, John. "Measurement and analysis of multi-site photoplethysmographic pulse waveforms in health and arterial disease." Thesis, University of Newcastle Upon Tyne, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.247830.

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12

Zaunseder, Sebastian, Alexander Trumpp, Hannes Ernst, Michael Förster, and Hagen Malberg. "Spatio-temporal analysis of blood perfusion by imaging photoplethysmography." SPIE, 2018. https://tud.qucosa.de/id/qucosa%3A35157.

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Imaging photoplethysmography (iPPG) has attracted much attention over the last years. The vast majority of works focuses on methods to reliably extract the heart rate from videos. Only a few works addressed iPPGs ability to exploit spatio-temporal perfusion pattern to derive further diagnostic statements. This work directs at the spatio-temporal analysis of blood perfusion from videos. We present a novel algorithm that bases on the two-dimensional representation of the blood pulsation (perfusion map). The basic idea behind the proposed algorithm consists of a pairwise estimation of time delay
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13

Aniagyei-Mensah, Gideon. "Noninvasive Detection of Central Venous Waveform Using Photoplethysmography." Thesis, Université d'Ottawa / University of Ottawa, 2014. http://hdl.handle.net/10393/30711.

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Information about the central venous pressure is important in evaluating several clinical conditions including cardiac failure and volume overload. The jugular veins serve as a primary route for the indirect estimation of the central venous pressure or waveform. The conventional methods for acquiring the central venous pressure in these veins have been through neck visualization and the insertion of catheters. Even though these procedures are effective if done properly, they have various downsides such as being invasive, inaccurate and time consuming. In this research, a sensor is proposed fo
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14

Ravindranathan, Devi. "Photoplethysmography for the evaluation of diabetic autonomic neuropathy." Thesis, Cardiff University, 2009. http://orca.cf.ac.uk/54981/.

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The aim of this study was to determine if photoplethysmography (PPG) could be used to analyse the foot microvascular changes caused by diabetic autonomic neuropathy. The digital PPG signals were collected from 37 healthy volunteers (Group I), 35 diabetic patients (Group II), and 38 diabetic patients with sensory neuropathy (Group III) and analysed using MAT LAB. Prominent spectral peaks with sidebands were obtained at both the high frequency (HF) and the low frequency (LF) end of the Fourier spectrum of these PPG signals. Previous studies of microcirculation have shown that both are sympatheti
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15

Soleimani, Vahid. "Remote depth-based photoplethysmography in pulmonary function testing." Thesis, University of Bristol, 2018. http://hdl.handle.net/1983/f6a6f7b6-943f-43f7-b684-1612161aee1a.

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This thesis introduces several novel, noninvasive lung function assessment approaches in which we incorporate computer vision techniques to remotely compute standard clinical Pulmonary Function Testing (PFT) measures. Using a single depth sensor, a dynamic 3-D model of a subject's chest is reconstructed and used to generate chest volume-time data by estimating the chest volume variation throughout a sequence. Following computation of multiple keypoints and calibration of volume-time data to present real volume of exchanged air, 7 Forced Vital Capacity (FVC) measures and 4 Slow Vital Capacity (
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16

Patterson, James. "A photoplethysmography system optimised for pervasive cardiac monitoring." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/11110.

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Photoplethysmography is a non-invasive sensing technique which infers instantaneous cardiac function from an optical measurement of blood vessels. This thesis presents a photoplethysmography based sensor system that has been developed speci fically for the requirements of a pervasive healthcare monitoring system. Continuous monitoring of patients requires both the size and power consumption of the chosen sensor solution to be minimised to ensure the patients will be willing to use the device. Pervasive sensing also requires that the device be scalable for manufacturing in high volume at a buil
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17

Chatterjee, Subhasri. "Monte Carlo investigation of light-tissue interaction in photoplethysmography." Thesis, City, University of London, 2018. http://openaccess.city.ac.uk/21266/.

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Photoplethysmography (PPG) is a non-invasive photometric technique which measures changes in the volume of blood in the biological tissue. PPG is well-known for its application in pulse oximetry used for the continuous monitoring of arterial blood oxygen saturation (SpO2). Over the past decade, there has been a plethora of research in the field of PPG, with potential applications beyond pulse oximetry and heart rate monitoring. Such applications explore the utilisation of PPG for the assessment of various bio-markers relating to vascular mechanics, haemodynamics and many others. With the growi
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18

Abay, Tomas. "Reflectance photoplethysmography for non-invasive monitoring of tissue perfusion." Thesis, City, University of London, 2016. http://openaccess.city.ac.uk/16923/.

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Monitoring blood perfusion and oxygenation changes is of vital importance and for this reason many different 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, mainly the pulsatile component of the signal (AC PPG) is used while the continuous DC component is mostly excluded. Near Infrared Spectroscopy (NIRS) is another optical technique that measures
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19

Nilsson, Lena. "Respiratory monitoring using reflection mode photoplethysmography : clinical and physiological aspects /." Linköping : Dept. of Medicine and Care, Univ, 2005. http://www.bibl.liu.se/liupubl/disp/disp2005/med898s.pdf.

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20

Roald, Nikolai Grov. "Estimation of Vital Signs from Ambient-Light Non-Contact Photoplethysmography." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-20869.

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Abstract In this thesis we have investigated different aspects of non-contact photoplethysmography (PPG) using only ambient lighting. We have investigated how to develop a functional, automatic system based on this to detect heart rate. We have also investigated how to use the concept of non-contact PPG to acquire further relevant medical information from a human subject. Abstract We have investigated different color spaces and found that the Hue and Saturation channels from HSL and HSV color spaces are far superior to the Green channel of the RGB color space, which has previously been used. E
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21

Qin, Dong. "HAND-ARM VIBRATION EXPOSURE MONITORING WITH SKIN TEMPERATURE AND PHOTOPLETHYSMOGRAPHY." Case Western Reserve University School of Graduate Studies / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=case1492098556166678.

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22

Botina, Monsalve Deivid. "Remote photoplethysmography measurement and filtering using deep learning based methods." Electronic Thesis or Diss., Bourgogne Franche-Comté, 2022. http://www.theses.fr/2022UBFCK061.

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RPPG est une technique développée pour mesurer le signal du pouls et ensuite estimer les données physiologiques telles que la fréquence cardiaque, la fréquence respiratoire et la variabilité du pouls.En raison des multiples sources de bruit qui détériorent la qualité du signal RPPG, les filtres conventionnels sont couramment utilisés. Cependant, certaines altérations demeurent, alors qu'un œil expérimenté peut facilement les identifier. Dans la première partie de cette thèse, nous proposons le réseau LSTMDF (Long Short-Term Memory Deep-Filter) pour réaliser le filtrage du signal RPPG. Nous uti
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Almond, Nicholas Edward. "A fibre-optic laser Doppler flowmeter system and its application to the study of the skin microcirculation in humans." Thesis, Queen Mary, University of London, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.389908.

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24

Wenngren, Wilhelm Sven Ingemar. "Local pulse wave velocity detection over an arterial segment using photoplethysmography." University of British Columbia, 2017. http://hdl.handle.net/2429/63867.

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The goal of this thesis is to determine the validity of using photoplethysmography (the detection of changes of blood volume using light) to measure pulse wave velocity as part of a continuous and non-disruptive blood pressure monitor. There has been a limited advancement over the years in technologies to monitor personal blood pressure, which have rendered at-home monitoring still relatively intrusive. The main method for at-home blood pressure monitoring is the use of an inflating cuff that obstructs the artery to detect pressure. This system suffers from inherit drawbacks, such as limitatio
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25

Shaltis, Phillip Andrew. "A wearable blood pressure sensor using oscillometric photoplethysmography and micro accelerometers." Thesis, Massachusetts Institute of Technology, 2007. http://hdl.handle.net/1721.1/40363.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2007.<br>Includes bibliographical references (leaves 119-124).<br>Monitoring arterial blood pressure (ABP) with a sensor virtually imperceptible to the wearer, for continuous periods of weeks, months, or years, could prove revolutionary in the diagnosis and treatment of chronic hypertension and heart failure, as well as a monitoring tool for convalescing individuals, and individuals in hazardous duty (such as firefighters or soldiers). To this end, a miniaturizable, non-invasive blood pressure sensor is de
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26

Njoum, H. "Investigations of photoplethysmography in the assessment of haemodynamics, vascular mechanics and haemorheology." Thesis, City, University of London, 2017. http://openaccess.city.ac.uk/17837/.

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Real‐time cardiovascular assessment is vital for monitoring patients at an early stage of cardiovascular diseases (CVDs), at risk of reoccurrence of heart attacks and strokes and during pharmacological and non‐pharmacological treatments. Blood Pressure (BP), Arterial Stiffness (AS) and Blood Viscosity (BV) are three essential parameters that can provide a reliable assessment of hypertension, atherosclerosis, and hyperviscosity associated with the development and progression of cardiovascular pathologies to complex stages. The currently available methods designed for evaluation of such paramete
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Cherif, Safa. "Effective signal processing methods for robust respiratory rate estimation from photoplethysmography signal." Thesis, Ecole nationale supérieure Mines-Télécom Atlantique Bretagne Pays de la Loire, 2018. http://www.theses.fr/2018IMTA0094/document.

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Le photopléthysmogramme (PPG) est un signal optique acquis à partir de l’oxymètre de pouls, dont l’usage principal consiste à mesurer la saturation en oxygène. Avec le développement des technologies portables, il est devenu la technique de base pour la surveillance de l’activité cardio-respiratoire des patients et la détection des anomalies. En dépit de sa simplicité d'utilisation, le déploiement de cette technique reste encore limité pour deux principales raisons : 1. L’extrême sensibilité du signal aux distorsions. 2. La non-reproductibilité entre les sujets et pour les mêmes sujets, en rais
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Chan, Gregory Electrical Engineering &amp Telecommunications Faculty of Engineering UNSW. "Early detection of blood loss using a noninvasive finger photoplethysmographic pulse oximetry waveform." Publisher:University of New South Wales. Electrical Engineering & Telecommunications, 2008. http://handle.unsw.edu.au/1959.4/42593.

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Delayed control of haemorrhage or blood loss has been recognised as a major contributor to preventable trauma deaths, but early detection of internal bleeding is difficult due to unreliability of heart rate (HR) and blood pressure (BP) as markers of volume status. This thesis explores a novel method of early blood loss detection using a noninvasive finger photoplethysmographic (PPG) pulse oximetry waveform that is normally utilised in pulse oximeters for estimating arterial oxygen saturation. Graded head-up tilt (n = 13) and blood donation (n = 43) in human volunteers were selected as experim
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Rustand, Åsmund. "Ambient-light Photoplethysmography : - How can I tell your pulse from looking at your face?" Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for elektronikk og telekommunikasjon, 2012. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-18848.

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This thesis is an attempt to explore certain aspects of the subject called non-contact, ambient-light photoplethysmography, where we hope to reveal benecialproperties the technique may have. We have a clear focus on technical possibilitybut the medical relevance of it is also discussed and conrmed.Conclusions from previous work are exemplied { the ability we have with thismethod to compute an exact heart rate estimate, from the skin surface both onour face and in the palm of our hand, with and without the subject moving duringrecording; the presence of signal uctuations akin to those of breath
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Mateus, Jaime (Pereira de Mateus Silva). "Photoplethysmography for non-invasive measurement of bone hemodynamic responses to changes in external pressure." Thesis, Massachusetts Institute of Technology, 2011. http://hdl.handle.net/1721.1/67174.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2011.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 123-135).<br>Adequate blood supply and circulation in bones is required to maintain a healthy skeleton, and inadequate blood perfusion is associated with numerous bone pathologies and a decrease in bone mineral density (BMD). Bone hemodynamics remains poorly understood and loss of BMD is still one of the limiting factors to long duration human spaceflight. Developments in photoplethysmography (PPG) hardware have
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Kiehl, Zachary Adam. "Measuring Pulse Rate Variability During Motion Artifact with a Non-Contact, Multi-Imager Photoplethysmography System." Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1430403954.

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32

Dall'Olio, Lorenzo. "Estimation of biological vascular ageing via photoplethysmography: a comparison between statistical learning and deep learning." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/21687/.

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This work aims to exploit the biological ageing phenomena which affects human blood vessels. The analysis is performed starting from a database of photoplethysmographic signals acquired through smartphones. The further step involves a preprocessing phase, where the signals are detrended using a central moving average filter, demoduled using the envelope of the analytic signal obtained from the Hilbert transform, denoised using the central moving average filter over the envelope. After the preprocessing we compared two different approaches. The first one regards Statistical Learning, which invo
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Schäck, Tim [Verfasser], Abdelhak M. [Akademischer Betreuer] Zoubir, D. Robert [Akademischer Betreuer] Iskander, and Michael [Akademischer Betreuer] Muma. "Photoplethysmography-Based Biomedical Signal Processing / Tim Schäck ; Abdelhak M. Zoubir, D. Robert Iskander, Michael Muma." Darmstadt : Universitäts- und Landesbibliothek Darmstadt, 2019. http://d-nb.info/1176702009/34.

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McGuinness, Abdollahi Zahra. "Intra-operative optical monitoring of bowel tissue viability based on photoplethysmography and laser Doppler flowmetry." Thesis, City University London, 2015. http://openaccess.city.ac.uk/13684/.

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Determination of bowel viability in patients undergoing bowel resection is essential in gastrointestinal surgery. One of the most common operations in gastrointestinal surgery is bowel resection for patients who have different kinds of bowel cancer or any other occlusion in which anastomosis has to be carried out following the removal of an unhealthy segment of the bowel. Monitoring blood flow in abdominal surgery especially intraoperatively would be a valuable tool for prevention of a postoperative anastomosis complication (e.g. anastomotic leak, which is the main complication after colorecta
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Patancheru, Govardhan Reddy. "Wearable Heart Rate Measuring Unit." Thesis, Mittuniversitetet, Avdelningen för elektronikkonstruktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-23351.

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Despite having the numerous evolved heart rate measuring devices and progress in their development over the years, there always remain the challenges of modern signal processing implementation by a comparatively small size wearable device. This thesis paper presents a wearable reflectance photoplethysmography (PPG) sensor system for measuring the heart rate of a user both in steady and moving states. The size and, power consumption of the device are considered while developing, to ensure an easy deployment of the unit at the measuring site and the ability to power the entire unit with a batter
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Ramli, Nur Ilyani Binti. "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." Thesis, University of Bradford, 2014. http://hdl.handle.net/10454/7291.

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A low cost Heart Beat Monitoring device (HBMD) for detecting heart beat in beats per minute is presented 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 physiological artefacts and interference. In order to achieve the aim and objectives of the research, this thesis thoroughly explores two new signal conditioning hardware designs. Firstly is the design and fabr
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Shafique, Muhammad. "Investigation of photoplethysmography and arterial blood oxygen saturation during artificially induced peripheral hypoperfusion utilising multimode photometric sensors." Thesis, City University London, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.531784.

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Ramli, Nur Ilyani Binti. "Design and development of a low cost heart best monitor device using finger photoplethysmography technique : circuit 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." Thesis, University of Bradford, 2014. http://hdl.handle.net/10454/7291.

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A low cost Heart Beat Monitoring device (HBMD) for detecting heart beat in beats per minute is presented 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 physiological artefacts and interference. In order to achieve the aim and objectives of the research, this thesis thoroughly explores two new signal conditioning hardware designs. Firstly is the design and fabr
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Hilmersson, Anette. "Multisensor Stress Monitoring For Non-Stationary Subjects." Thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-28340.

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Monitoring stress in real-time, in a non-laboratory environment can be benecial in several applications. One of these, which have been the motivation for this thesis, is to to perform this measurement during Attention decit hyperactivity disorder (ADHD) diagnosis. Monitoring several physiological responses to internal or external stimuli in a single soft-real-time system is nota solution widely used in an application like this. The thesis starts by studying several stress related responses in detail. Sensors for all of the responses are not implemented nor is it possible toimplement in to the
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KUO, CHUN-HUNG, and 郭俊宏. "Blood Pressure Estimation Using Photoplethysmography." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/3qt8p6.

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碩士<br>國立中正大學<br>電機工程研究所<br>104<br>In this study, we proposed a blood pressure estimation system. We estimated systolic and diastolic blood pressure by using Photoplethysmography (PPG). The database collected by the projects supported by the grants from Ministry of Science and Technology (NSC 102-2410-H-194-022) to Chia-Ying Weng. The system contained five parts, namely data classification, physiological signal acquisition, feature points detection, feature extraction, and blood pressure estimation. In the data classification part, data were divided into four categories including healthy stude
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Schäck, Tim. "Photoplethysmography-Based Biomedical Signal Processing." Phd thesis, 2019. https://tuprints.ulb.tu-darmstadt.de/8411/1/2019-01-24_Sch%C3%A4ck_Tim.pdf.

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In this dissertation, photoplethysmography-based biomedical signal processing methods are developed and analyzed. The developed methods solve problems concerning the estimation of the heart rate during physical activity and the monitoring of cardiovascular health. For the estimation of heart rate during physical activity, two methods are presented that are very accurate in estimating the instantaneous heart rate at the wrist and, at the same time, are computationally efficient so that they can easily be integrated into wearables. In the context of cardiovascular health monitoring, a method for
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Huang, Fu-Hsuan, and 黃福塤. "Analysis of Reflectance Photoplethysmography Sensor." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/18410700934549786797.

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碩士<br>中原大學<br>醫學工程研究所<br>97<br>Photoplethysmography is an easy method for measuring blood volume change in tissue. It's detect signals include: the vasoconstriction low frequency signal and the pulse's high frequency signal.Since the transmission type of measurement is limited to only a few specific positions that have a short pathlength.The reflectance type can be more convenient to apply on most part of body surface.This study is to analyze the factors that determine the quality of light reflectance signal. These factors include: the emitter-detector distance, wavelength, light intensity, an
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HUANG, YEN-TING, and 黃彥庭. "Attention Level Recognition Based on Photoplethysmography." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/u8sk88.

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碩士<br>國立中正大學<br>電機工程研究所<br>104<br>In this research, we proposed an attention recognition system based on physiological signals. We used Photoplethysmography (PPG) to recognize different attention level so three attention level combination settings were analyzed. The first combination included attention, minor attention, and non-attention. The second combination included two levels, one was non-attention and the other was the combination of attention and minor attention. The third combination contained attention and non-attention levels. In our study, the attention recognition system was compo
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Jan, Hao-Yu, and 詹皓羽. "Applications of Photoplethysmography for Cardiovascular diagnosis." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/99t2x8.

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碩士<br>中原大學<br>電機工程研究所<br>92<br>The aim of this study is to <a href="http://www.ntsearch.com/search.php?q=design&v=56">design</a> and develop a simultaneous measuring SaO2 and ECG system based on double wavelength-infrared and red light optic system and simple physiological electric signal detection device. This system could measure real-time SaO2 signal and ECG signal simultaneously. When combine with SaO2 signal and ECG signal, we can go deep to analyze cardiovascular parameters. In this study, we use three channel signal-- Infrared PPG, Red PPG and ECG signals to obtain every subject’s
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HUANG, HSIAO-YU, and 黃筱玉. "Optical characteristics and structural analysis of Photoplethysmography." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/18363078547815253675.

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碩士<br>聖約翰科技大學<br>電子工程系碩士班<br>104<br>Photoplethysmogram (PPG) using light illuminate into the skin, light will be through the biological tissues, the vascular caliber changes caused by heart beats, after irradiation of light by refraction, to produce a continuous variation waveform signal received by the receiver, can achieve non-invasive measurement of the amount of the purpose of the application in the human body and physiological signals measured. Nowadays people are more health conscious, many wearable devices are toward the development of health care, in which the optical heart rate monito
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Ting-YuKuo and 郭庭瑀. "The Analysis of the Photoplethysmography Signal Characteristic." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/75658534438529179755.

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碩士<br>國立成功大學<br>工程科學系<br>104<br>This thesis serves to find the characteristics of light sensors for PPG sensing. Though the light sensors are convenient to employ, the quality of the PPG signal is usually affected by noises and motion artifacts. Therefore, it is essential to know the PPG signal features under different conditions. The PPG signal can be obtained by light sensors of different wavelengths; this study uses three kinds of LEDs to implement for examination, including green (525 nm), red (660 nm), infrared (950 nm) lights. The penetration depth varies with respect to wavelengths,
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Chang, Chao-Feng, and 張肇峰. "Analysis natural heart rate variability using photoplethysmography." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/61496551429946367984.

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碩士<br>中原大學<br>醫學工程研究所<br>96<br>This innovation is related to measuring the heart rate under unawareness of subject to extract the true nature heart rate variability. The Heart Rate Variability (HRV) is an important index that could be used for long term monitor of cardiac function. The low variability of heart rate indicates that the cardiac rhythm could not be regulated by autonomic nerve system. It is not a healthy condition for regular daily activities. This innovation has devised a portable photo-plethysmo-graphy (PPG) through an ear plug appliance. The PPG signal was acquired and analyzed
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Shen, Ta-Yu, and 沈大祐. "Recognition of Serious Arrhythmia Using Electrocardiogram and Photoplethysmography." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/farv99.

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碩士<br>國立中正大學<br>電機工程研究所<br>104<br>In this study, we proposed a serious arrhythmia recognition system based on two physiological signals. Electrocardiogram (ECG) and Photoplethysmprgraphy (PPG) were used to recognize four kinds of disease, including bradycardia, tachycardia, ventricular tachycardia, and asystole. The proposed method was divided into two parts. The first part was the direct identification method that recognized serious arrhythmias by a continuous heart rate and pulse width characteristics. The second part used direct identification combined with a classifier for recognition. Two
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Chen, Yuwei, and 陳昱維. "Study on photoplethysmography signal measurements of respiratory rate." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/68349212714129687672.

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碩士<br>聖約翰科技大學<br>電子工程系碩士班<br>100<br>The advantage of Photoplethysmography measurement easy to set up, PPG contains many physiological parameters such as heart rate, respiratory rate, arterial stiffness index, and easy to use and low cost. This study is based on measurement of respiratory rate, the architecture consist of software and hardware, hardware by the high-pass filter, an inverting amplifier, low pass filter combination, is mainly responsible for the PPG of signal acquisition, filtering and signal amplification software by MATLAB finite impulse response filter (FIR) with zero phase s
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Yang, Tzong-Lin, and 楊宗霖. "Noninvasive estimation of continuous arterial blood pressure using Photoplethysmography." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/70710518567518363683.

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碩士<br>國立臺灣大學<br>醫學工程學研究所<br>98<br>Continuous Blood pressure is one of the most important vital signs to evaluate cardiac-vascular system conditions especially monitoring in intensive care units and operation zones. However, the usage of arterial-line is the most common method of continuous blood pressure measurement. It is measuring real-time blood pressure variations and waveforms directly and reliably, but it neither sets up complex nor is an invasive procedure to induce the risks, like infection or embolism. Photoplethysmography is a non-invasive technology to measure the change of tissue v
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