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PPG signal quality assessment and heart rate estimation
Vargová, Enikö ; Vítek, Martin (referee) ; Němcová, Andrea (advisor)
This work deals with photoplethysmographic (PPG) signals, their processing, quality assessment, estimation of heart rate from PPG signals and the ability to record biological signals with smartphones. The aim of this work is to record PPG signals using a smartphone and reference ECG signals using an ECG recorder. The work also includes the design of two algorithms, one for signal quality assessment and the other for heart rate estimation from PPG signals.
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Analyzer of cardiac waveform
Zmeškal, Ladislav ; Říha, Kamil (referee) ; Číž, Radim (advisor)
The thesis describes design, algorithmization and realization of graphical application for recording EKG and PPG signal using LabJack UE9 tool in Matlab program, it also describes subsequent deposition of recorded signals and their processing, such as optional selection, cropping and filtering. Furthermore there are described types of filters, methods for detecting basic parameters of EKG and PPG signals and methods for detecting R waves and Systolic peaks. Based on detection of those parameters, algorithms for computing average heart rate and finding arrhythmias were designed and tested. Last part of the thesis includes an evaulation which compares values detected by designed algorithms with values from public database which includes reference annotation.
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Advanced methods for sleep quality assessment
Doležalová, Anna ; Králík, Martin (referee) ; Ronzhina, Marina (advisor)
This diploma thesis is focused on advanced sleep assessment using deep learning. Metrics for sleep assessment and their use are described here. There are hearth rate and accelerometer data from Apple Watch used for classification. The basis for the classification was a model composed of 1D convolution networks in combination with recurrent neural network. LSTM and GRU were used as recurrent networks. Models were taught to classify into two, three and five phases. At last the resulting methods are compared.
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Analysis of pulse wave propagation in aorta
Tichoň, Dušan ; Klas, Roman (referee) ; Burša, Jiří (advisor)
The aim of this diploma thesis is to assess the applicability of pulse wave propagation monitoring in the cardiovascular system in the field of prediction and early diagnosis of abdominal aortic aneurysm (AAA). The very first part is focused on description of heart and blood vessels with its pathological changes in presence of aneurysm. For this reason, current methods of monitoring and surgical treating of AAA were mentioned. Due to their difficult clinical use widely in the population, new methods based on pulse wave monitoring were presented. Using an analytical approach we estimated the difference in the arrival of the pulse wave at measurable locations between healthy and pathological aorta in the order of miliseconds. By experimental monitoring using photoplethysmographic sensors, we observed significant changes of pulse wave velocity with respect to the mechanical properties of the artery wall (mainly associated with age), which we tried to implement by hyperelastic material models used in computational simulations of pulse wave proagation on simplified geometries by fluid structure interaction method. These analyzes should verify applicability of FSI simulations in further development of diagnostic methods of AAA.
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Photoplethysmography using a smartphone
Dräxler, Vladislav ; Němcová, Andrea (referee) ; Janoušek, Oto (advisor)
The diploma thesis deals with the use of digital photoplethysmography (PPG) technology. The thesis describes the process of acquisition of the photoplethysmographic curve using a smartphone, preprocessing of the PPG signal, calculation of parameters and evaluation of the quality of the obtained data. The practical part includes a measurement protocol for different experimental conditions, describes an algorithm for obtaining a photoplethysmographic curve from video recordings and deals with determining the parameters of the PPG curve and evaluating the quality of the obtained PPG signal. The output of the work is an optimal acquisition protocol for digital scanning of the PPG curve.
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Effect of acquisition site compression in multisite photoplethysmography
Hofrová, Lucie ; Kolář, Radim (referee) ; Janoušek, Oto (advisor)
The theoretical part of the thesis describes the pulse wave's origin, the principle of photoplethysmography, and the influence of vein compression on the morphology of the photoplethysmograph caused by external pressure during PPG signal measurement. Furthermore, the thesis contains the measurement and analysis of the PPG bilateral signal, which is used for the evaluation of whether there are differences between the PPG signal measured on the left or the right side of the human body. A dataset consisting of 10 volunteers was created for evaluation. The practical part contains the algorithm which analysis the PPG signal. Furthermore, normalization and statistical analysis is performed. The results show that external pressure has an effect on pulse wave width analysis and heart rate. When the pressure is high, the ability of pulse wave analysis is impaired.
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Breathing Rate Estimation from the Photoplethysmogram
Petrík, Jakub ; Králík, Martin (referee) ; Kozumplík, Jiří (advisor)
The main topic of this bachelor thesis are methods for breathing rate estimations from photopletysmographic signals. In the theoretical part of the thesis we find a biref review of methods that are used for breathing rate estimation. These methods are than tested and their performance is evaluated on two pubilc databases BIDMC and CapnoBase. These databases also contain reference values of respiratory rate.
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Vital Signs Monitoring
Kratochvíl, Pavel ; Mrázek, Vojtěch (referee) ; Vašíček, Zdeněk (advisor)
Cieľom tejto práce je navrhnúť dizajn, implementovať prototyp a evaluovať funkčnosť systému pre monitorovanie životných funkcií. Navrhnuté riešienie je založené na Bluetooth Low Energy Mesh sieti, v ktorej sa nachádzajú zariadenia štyroch typov: batériou napájané nositeľné monitorovacie zariadenie zbierajúce fotopletysmografické dáta zo senzora a rozosielajúce extrahované informácie o frekvencii srdcového tepu a periférneho okysličenia subjektu do mesh siete; zariadenia preposielajúceho dáta v sieti (relay node); nosného zariadenia konfigurujúceho mesh sieť pri jej inicializácii (provisioner node) a koncového zariadenia, ktoré odosiela dáta prijaté v mesh sieti pomocou protokolu MQTT na internet. Batériou napájané monitorovacie zariadenia sú implementované na module nRF52833 od firmy Nordic Semiconductor, zatiaľ čo koncové zariadenia komunikujúce cez MQTT protokol využívajú ESP32 moduly od firmy Espressif. Analýza zozbieraných PPG dát je dosiahnutá dvojitou filtráciou (spredu a zozadu) pomocou Chebyshev II band-pass filtra štvrtého rádu, následovanou vyhladením dát s použitím kĺzavého priemeru a extrakciou indikátorov životných funkcií algoritmom s jediným priechodom v nazbieraných vzorkách. Vďaka výbornej energetickej úspornosti zariadení a minimálnej vyžadovanej infraštruktúre predstavuje navrhnutý systém vhodné riešenie pre zdravotnícke zariadenia s obmedzenými finančnými zdrojmi.
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Interface for plethysmographic sensor
Špánik, Šimon ; Barcík, Peter (referee) ; Kolka, Zdeněk (advisor)
The bachelor's thesis deals with the topic of photoplethysmography and the signal produced by the photoplethysmographic sensor. The goal is to design a laboratory device that would serve as an interface between a photoplethysmographic sensor and a computer. The work describes the anatomy and function of the human heart, the principle of photoplethysmography, and the properties of the sensor in terms of input and output signals. Also presented here is the method of powering and filtering the relevant circuits in the form of an additional printed circuit board for a standard Arduino microprocessor module, which is powered by USB. Furthermore, in the work, it is possible to find a solution to the influence of unwanted signals using filter analog circuits and the minimization of the measured signal's own noise, which prevents the signal from continuous values to discrete time and subsequent storage using a computer application on the data storage for subsequent signal processing.
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