Ewaryst Janusz Tkacz

Ewaryst Janusz Tkacz
Silesian University of Technology · Department of Biosensors and Processing of Biomedical Signals

Professor

About

137
Publications
16,509
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
501
Citations
Citations since 2016
60 Research Items
330 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Additional affiliations
May 2012 - May 2017
Polish Academy of Sciences
Position
  • Professor (Full)
February 1994 - October 1994
University of Miami
Position
  • Professor
Description
  • Iwas involved in the research concerning novel methodology of processing of HRV signals
October 1989 - July 1990
University of Kent
Position
  • PostDoc Position
Description
  • British Council Fellowship at the University of Kent at Canterbury, Medical Electronics Research Group

Publications

Publications (137)
Preprint
Full-text available
Heart rate variability (HRV) is a physiological variation of intervals between consecutive heart beats that reflects the activity of the autonomic nervous system. This parameter is traditionally evaluated on the basis of elec-trocardiograms (ECG signals). Because seismocardiog-raphy (SCG) registers cardiac mechanical activity, it may be used in HRV...
Conference Paper
The physical performance of an athlete is based on monitoring several parameters in response to a known stimulus in a controlled environment. In our study, we applied a stress test on a treadmill with the regulated speed and incline. Because traditional parameters describing physical performance (heart rate, blood lactate concentration, VO 2 max) d...
Article
Full-text available
The aim of the study was to compare the accuracy of the classification pertaining to the results of two types of soft tissue and bone reconstructions of the spinal CT in detecting the porosity of L1 vertebral body spongy tissue. The dataset for each type of reconstruction (high-resolution bone reconstruction and soft tissue reconstruction) included...
Article
Full-text available
Analyzing biomedical data is a complex task that requires specialized knowledge. The development of knowledge and technology in the field of deep machine learning creates an opportunity to try and transfer human knowledge to the computer. In turn, this fact influences the development of systems for the automatic evaluation of the patient’s health b...
Chapter
Assessment of the current physical performance of an athlete relies on monitoring several parameters in response to a stimulus. One of them is a fast march on a treadmill with regulated speed and incline. Because traditional parameters describing physical performance (heart rate, blood lactate concentration, VO2max) do not provide specific informat...
Chapter
Visual memory plays an important role in learning to read, write, spell, or draw. The dysfunction of visual memory can be detected by applying tests, such as Benton Visual Retention Test (Benton Test, BVRT), which is based on displaying ten patterns for ten seconds per each pattern and asking the subject to reproduce the displayed patterns. The pur...
Chapter
Full-text available
Most patients undergoing diagnostic imaging of coronary artery disease do not show significant coronary artery stenosis. Despite this, they are exposed to the negative effects related to the radiation and administration of the contrast agent. An effective preselection of patients for further diagnostics may be the solution. There are reports of mac...
Article
Full-text available
The pandemic declared in many countries in 2020 due to COVID-19 led to the freezing of economies and the introduction of distance learning in both schools and universities. This unusual situation has affected the mental state of citizens, which has the potential to lead to the development of post-traumatic stress and depression. This study aimed to...
Article
Full-text available
Citation: Sawaryn, B.; Piaseczna, N.; Sieciński, S.; Doniec, R.; Duraj, K.; Komorowski, D.; Tkacz, E.J. The Assessment of the Condition of Knee Joint Surfaces with Acoustic Emission Analysis. Sensors 2021, 21, 6495. Abstract: The knee joint, being the largest joint in the human body, is responsible for a great percentage of leg movements. The diagn...
Conference Paper
Full-text available
Caries is a common disease of hard tissues of teeth which results in dental cavities, which are usually replaced by dental filling. Matching the color of a dental filling is usually a subjective assessment. In this study we conducted a color analysis of GC Gradia Direct shade guide in the lighting conditions of the dental office. Color measurement...
Article
Full-text available
Stress is a physical, mental, or emotional response to a change and is a significant problem in modern society. In addition to questionnaires, levels of stress may be assessed by monitoring physiological signals, such as via photoplethysmogram (PPG), electroencephalogram (EEG), electrocardiogram (ECG), electrodermal activity (EDA), facial expressio...
Preprint
Caries is a common disease of hard tissues of teeth which results in dental cavities, which are usually replaced by dental fillings. Matching the color of a dental filling is usually a subjective assessment. In this study we conducted a color analysis of GC Gradia Direct shade guide in the lighting conditions of the dental office. Color measurement...
Preprint
Visual memory plays an important role in learning to read, write, spell, or draw. The dysfunction of visual memory can be detected by applying tests, such as Benton Visual Retention Test (Benton Test, BVRT), which is based on displaying ten patterns for ten seconds per each pattern and asking the subject to reproduce the displayed patterns. The pur...
Presentation
Full-text available
Presentation of the paper “Automatic Assessment of Benton Visual Retention Test Results: A Pilot Study” presented online at the XXII Polish Conference on Biocybernetics and Biomedical Engineering, Warsaw, Poland, 19-21 May 2021
Article
Full-text available
Background: Dental schools are considered to be a very stressful environment; the stress levels of dental students are higher than those of the general population. The aim of this study was to assess the level of stress among dental students while performing specific dental procedures. Methods: A survey was conducted among 257 participants. We u...
Book
This book presents a compact study on recent concepts and advances in biomedical engineering. The ongoing advancement of civilization and related technological innovations are increasingly affecting many aspects of our lives. These changes are also visible in the development and practical application of new methods for medical diagnosis and treatme...
Article
Full-text available
Drugs administered in chemotherapy influence the patient's hematopoietic system. The side effects of chemotherapy can force changes in both the dose of drugs and the schedule of their administration, which in turn may adversely affect the patient's health. During chemotherapy treatment, there is a necessity to continuously monitor basic blood param...
Article
Full-text available
Background and objective: Driving a car is a complex activity which involves movements of the whole body. Many studies on drivers' behavior are conducted to improve road traffic safety. Such studies involve the registration and processing of multiple signals, such as electroencephalography (EEG), electrooculography (EOG) and the images of the drive...
Article
Full-text available
Gyrocardiography (GCG) is a non-invasive technique of analyzing cardiac vibrations by a MEMS (microelectromechanical system) gyroscope placed on a chest wall. Although its history is short in comparison with seismocardiography (SCG) and electrocardiography (ECG), GCG becomes a technique which may provide additional insight into the mechanical aspec...
Preprint
Full-text available
Gyrocardiography (GCG) is a non-invasive technique of analyzing cardiac vibrations by a MEMS (micro electromechanical) gyroscope placed on a chest wall. Although its history is short in comparison with seismocardiography (SCG) and electrocardiography (ECG), GCG becomes a technique which may provide additional insight into the mechanical aspects of...
Article
Full-text available
Physiological variation of the interval between consecutive heartbeats is known as the heart rate variability (HRV). HRV analysis is traditionally performed on electrocardiograms (ECG signals) and has become a useful tool in the diagnosis of different clinical and functional conditions. The progress in the sensor technique encouraged the developmen...
Preprint
Studies on driver's behavior play an important role considering road traffic safety. The behavior of drivers can be evaluated using both electrooculography (EOG) and deep learning approach. To acquire data we used JINS MEME smart glasses furnished with a 3-point EOG electrodes, 3-axial accelerometer and 3-axial gyroscope. Sensor data were acquired...
Preprint
Full-text available
Heart rate variability (HRV) is a valuable non-invasive tool of assessing the state of cardiovascular autonomic function. The interest in heart rate monitoring without electrodes led to the rise of alternative heart beat monitoring methods, such as gyrocardiography (GCG). The purpose of this study was to compare HRV indices calculated on GCG and EC...
Presentation
Full-text available
Heart rate variability (HRV) is a valuable non- invasive tool of assessing the state of cardiovascular autonomic function. The interest in heart rate monitoring without elec- trodes led to the rise of alternative heart beat monitoring methods, such as gyrocardiography (GCG). The purpose of this study was to compare HRV indices calculated on GCG and...
Preprint
Heart rate variability (HRV) is a physiological phenomenon in which the time interval between consecutive heart beats varies. HRV analysis is traditionally performed on electrocardiograms and has become a useful tool in diagnosis of different clinical and functional conditions. The progress in sensor technique encouraged the development of alternat...
Conference Paper
Heart rate variability (HRV) is a valuable noninvasive tool of assessing the state of cardiovascular autonomic function. The interest in heart rate monitoring without electrodes led to the rise of alternative heart beat monitoring methods, such as gyrocardiography (GCG). The purpose of this study was to compare HRV indices calculated on GCG and ECG...
Article
Full-text available
The subject of the submitted work is the proposal of electrodes for the continual measurement of the glucose concentration for the purpose of specifying further hemodynamic parameters. The proposal includes the design of the electronic measuring system, the construction of the electrodes themselves and the functionality of the entire system, verifi...
Preprint
Full-text available
Background: Proteins can interact with one another by an interface composed of two proteins. Some of the interface residues - called hot spots - have the greatest impact on binding energy in a protein complex. This paper introduces the application of continuous wavelet transform based on the fast Fourier transform (CWTFT) to the analysis of hot spo...
Article
Full-text available
Objectives: Swimming is one of the most popular forms of physical activity. Pool water is cleaned with chlorine, which - in combination with compounds contained in water - could form chloramines and trichloromethane in the swimmer's lungs. The aim of the present study was to examine the effect of swimming training in an indoor pool on the composit...
Conference Paper
Heart rate variability (HRV) is a physiological variation of time interval between consecutive heart beats caused by the activity of autonomic nervous system. Seismocardiography (SCG) is a non-invasive method of analyzing cardiac vibrations and can be used to obtain inter-beat intervals required to perform HRV analysis. Heart beats on SCG signals a...
Chapter
Full-text available
Heart rate variability (HRV) is the physiological variation of time between consecutive heart beats. Seismocardiography (SCG) is a non-invasive method of analyzing and recording cardiovascular vibrations transmitted to the chest wall. Mobile devices can monitor health parameters thanks to embedded sensors. In this study we compare HRV indices calcu...
Article
The aim of the study was to determine the effect of normalisation of spinal CT images on the accuracy of automatic recognition of defects in the spongy tissue structure of the vertebrae on the thoraco-lumbar region. Feature descriptors were based on the grey-levels histogram, gradient matrix, run-length matrix, coocurrence matrix, autoregression mo...
Chapter
In the paper, the analysis of hot spots in proteins with the aid of digital signal processing methods was conducted. The algorithm employs time-frequency filtering and continuous wavelet transform (CWT); its aim is to find amino acid regions where the characteristic frequency is dominant by detecting peaks in energy plot. The research showed that t...
Poster
Full-text available
Heart rate variability (HRV) is a physiological variation of time interval between consecutive heart beats caused by the activity of autonomic nervous system. Seismo- cardiography (SCG) is a non-invasive method of analyzing cardiac vibrations and can be used to obtain inter-beat intervals required to perform HRV analysis. Heart beats on SCG signals...
Article
Full-text available
Background: Heart rate variability (HRV) has become a useful tool of assessing the function of the heart and of the autonomic nervous system. Over the recent years, there has been interest in heart rate monitoring without electrodes. Seismocardiography (SCG) is a non-invasive technique of recording and analyzing vibrations generated by the heart u...
Preprint
Heart rate variability (HRV) is a physiological variation of time interval between consecutive heart beats caused by the activity of autonomic nervous system. Seismo-cardiography (SCG) is a non-invasive method of analyzing cardiac vibrations and can be used to obtain inter-beat intervals required to perform HRV analysis. Heart beats on SCG signals...
Chapter
Full-text available
Atrial fibrillation (AFib) is a supraventricular tachyarrhythmia characterized by uncoordinated atrial activation and ineffective atrial contraction. AFib affects 1–2% of the general population, its prevalence increases with age and may remain long undiagnosed. Due to costs of hospitalization and treatment related to AFib and increasing prevalence,...
Preprint
Heart rate variability (HRV) is the physiological variation of time between consecutive heart beats. Seismocardiography (SCG) is a non-invasive method of analyzing and recording cardiovascular vibrations transmitted to the chest wall. Mobile devices can monitor health parameters thanks to embedded sensors. In this study we compare HRV indices calcu...
Preprint
Background: Heart rate variability (HRV) has become a useful tool of assessing the function of the heart and of the autonomic nervous system. Over the recent years there has been interest in heart rate monitoring without electrodes. Seismocardiography (SCG) is a non-invasive technique of recording and analyzing vibrations generated by the heart usi...
Chapter
This article explores the possibility of using the higher-order spectra to identify different types of diseases. In order to assess the effectiveness of such tool the HRV (Heart Rate Variability) recordings obtained from patients suffering from three different cardiac problems are listed and compared to the results recorded for healthy subjects. Ea...
Book
This book presents the proceedings of the “Innovations in Biomedical Engineering IBE’2018” Conference held in Katowice, Poland from October 18 to 20, 2018, and discusses recent research on innovations in biomedical engineering. The book covers a broad range of subjects related to biomedical engineering innovations. Divided into four parts, it prese...
Conference Paper
Heart rate variability (HRV) is a valuable noninvasive tool of assessing the state of cardiovascular autonomic function. Over the recent years there has been interest in heart rate monitoring without electrodes. Seismocardiography (SCG) is a non-invasive technique of recording and analyzing cardiovascular vibrations. The purpose of this study is to...
Conference Paper
The paper presents the working model of the face tracking system. The proposed solution may be used as one of the parts of the rehabilitation or assistive robotic system and serve as the robotic vision subsystem or as the module controlling robotic arm. It is a low-cost design, it is based on open source hardware and software components. As a hardw...
Conference Paper
This article explores the possibility of using the higher-order spectra to identify different types of diseases. In order to assess the effectiveness of such tool the HRV (Heart Rate Variability) recordings obtained from patients suffering from three different cardiac problems are listed and compared to the results recorded for healthy subjects. Ea...
Conference Paper
The paper contains results of statistical and chemometric analysis for 15 thiourea derivatives containing the 3-amino-1,2,4-triazole moiety and characterized by antimicrobial activity against Staphylococcus aureus (NCTC 4163, ATCC 25923, ATCC 6538, ATCC 29213), Staphylococcus epidermidis (ATCC 12228) bacteria, as well as by low cytotoxicity (or lac...
Presentation
Full-text available
Heart rate variability (HRV) is a valuable non-invasive tool of assessing the state of cardiovascular autonomic function. Over the recent years there has been interest in heart rate monitoring without electrodes. Seismocardiography (SCG) is a non-invasive technique of recording and analyzing cardiovascular vibrations. The purpose of this study is t...
Chapter
Electrocardiography, technique, which is an essential tool in the diagnosis of heart disease, as well as other organs, is used by doctors for over 100 years. It is used to measure electrical activity of the heart as a function of time and present it in digital or analogue form. Whilst the standard 12 lead ECG is the basic clinical method of heart d...
Chapter
Full-text available
This article explores the possibility of using the higher-order spectra as a tool to determine the progress in rehabilitation of patients after ischemic brain stroke (IBS). In order to evaluate the effectiveness of this tool patients’ heart rate variability (HRV) recordings obtained at 1, 10 and 60 day after stroke are listed and compared to those...
Article
Electrogastrography (EGG) is a noninvasive technique for recording the myoelectrical activity of the stomach. An electrogastrographic signal recorded by using a four-channel system with electrodes placed on the surface of the skin is a mixture of a low-frequency gastric pacesetter potential known as a slow wave, electrical activity from other organ...
Book
This book presents the proceedings of the “Innovations in Biomedical Engineering IBE’2017” Conference held in Zabrze, Poland from October 19 to 20, 2017, and discusses recent research on innovations in biomedical engineering. The book covers a broad range of subjects related to biomedical engineering innovations. Divided into four parts, it present...
Chapter
Noncommunicable diseases (NCDs) kill 38 million people each year, 17.5 million among them die of cardiovascular diseases [1]. Although for over 100 years we know electrocardiography, technique which is essential tool in diagnosis of heart diseases, as well as other organs, still cardiovascular diseases are the deadliest from all NCDs. In XXI centur...
Chapter
In order to facilitate designing new drugs by means of the in silico method, it is necessary to first develop a model describing the influence of descriptors of a certain group of chemicals on their biological activity and cytotoxicity. For the purpose of this paper, the quantitative structure-cytotoxicity relationships have been determined for 11...
Article
In order to facilitate designing new drugs by means of the in silico method, it is necessary to first develop a model describing the influence of descriptors of a certain group of chemicals on their biological activity and cytotoxicity. For the purpose of this paper, the quantitative structure-cytotoxicity relationships have been determined for 11...
Article
Noncommunicable diseases (NCDs) kill 38 million people each year, 17.5 million among them die of cardiovascular diseases [1]. Although for over 100 years we know electrocardiography, technique which is essential tool in diagnosis of heart diseases, as well as other organs, still cardiovascular diseases are the deadliest from all NCDs. In XXI centur...
Book
This book presents the proceedings of the “Innovations in Biomedical Engineering IBE’2016” Conference held on October 16–18, 2016 in Poland, discussing recent research on innovations in biomedical engineering. The past decade has seen the dynamic development of more and more sophisticated technologies, including biotechnologies, and more general te...
Conference Paper
Full-text available
A system of synchronous recording and analysis of both direct motion signals acquired from MEMS accelerometer and physiological EMG, ECG, Heart Rate Variability (HRV) collected from masseter muscle is presented as an on-line tool for early sleep bruxism (SB) episode detection and prevention. A hybrid feature set extracted on-line after time-frequen...
Article
Full-text available
Chemical reactivity descriptors and lipophilicyty (logP) were evaluated via semi-empirical method for the quantum calculation of molecular electronic structure (PM3) in order to clarify the structure-cytotoxic activity relationships of disubstutited thioureas. Analysed compounds were obtained by the linkage of 2-aminothiazole ring, thiourea and sub...
Chapter
The electrogastrogram (EGG), a cutaneous recording of electrical activity in the stomach is a mixture of 3 cycle per minute (3 cpm) gastric pacesetter potential known as slow wave, electrical activity from other organs and noise. Proper slow wave propagation is responsible for gastric peristaltic contractions, which are the basis for emptying of so...
Chapter
Energy in protein complexes is not uniformly distributed. Some of amino acid residues—called hot spots—contribute most to the total energy of interaction. Hot spots can be determined experimentally or by computational methods. Here we present the application of time-frequency tools such as short-time Fourier transform and S transform to analyze hum...
Conference Paper
The aim of this study was to investigate the effectiveness of Empirical Mode Decomposition (EMD) for slow wave extraction from multichannel electrogastrographical signal (EGG) the cutaneous recording of gastric myoelectrical activity. From the pacemaker region of stomach both spontaneous depolarization and repolarization occur generating the myoele...
Conference Paper
Electrogastrography (EGG) is a test method designed for noninvasive assessment of gastric slow waves propagation. The EGG signal is obtained from the electrodes respectively arranged on the surface of the patient's abdomen. A significant problem during recording of the EGG signal is the elimination of disturbances occurring during registration and...
Conference Paper
Sleep bruxism events detection system is presented, based on integrated, synchronized on-line analysis of EMG signal, heart rave variability (HRV) obtained from ECG recordings as well as sympatho-vagal balance estimated in real time as an possible early indicator of upcoming bruxism episodes. As an relative reliable alternative for very complex sys...
Article
Full-text available
Electrogastrographic examination (EGG) is a noninvasive method for an investigation of a stomach slow wave propagation. The typical range of frequency for EGG signal is from 0.015 to 0.15 Hz or (0.015–0.3 Hz) and the signal usually is captured with sampling frequency not exceeding 4 Hz. In this paper a new approach of method for recording the EGG s...
Article
Department of Biosensors and Biomedical Signals Processing, headed by Professor Tkacz originates mainly from the Faculty of Automatic Control, Electronics and Computer Science, Silesian University of Technology in Gliwice and Centre of Polymer and Carbon Materials PAS in Zabrze. In 2005 at Silesian University of Technology an interdepartmental "bio...