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Tomasic, Ivan
Publications (10 of 24) Show all publications
Tomasic, I., Petrovic, N., Lindén, M. & Rashkovska, A. (2019). Comparison of publicly available beat detection algorithms performances on the ECGs obtained by a patch ECG device. In: 2019 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2019 - Proceedings: . Paper presented at 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2019, 20 May 2019 through 24 May 2019 (pp. 275-278). Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Comparison of publicly available beat detection algorithms performances on the ECGs obtained by a patch ECG device
2019 (English)In: 2019 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2019 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2019, p. 275-278Conference paper, Published paper (Refereed)
Abstract [en]

Eight ECG beat detection algorithms, from the PhysioNet's WFDB and Cardiovascular Signal toolboxes, were tested on twenty measurements, obtained by the Savvy patch ECG device, for their accuracy in beat detection. On each subject, one measurement is obtained while sitting and one while running. Each measurement lasted from thirty seconds to one minute. The measurements obtained while running were more challenging for all the algorithms, as most of them almost perfectly detected all the beats on the measurements obtained in sitting position. However, when applied on the measurements obtained while running, all the algorithms have performed with decreased accuracy. Considering overall percentage of the faulty detected peaks, the four best algorithms were jqrs, from the Cardiovascular Signal Toolbox, and ecgpuwave, gqrs, and wqrs, from the WFDB Toolbox, with percentages of faulty detected beats 1.7, 2.3, 2.9, and 3, respectively. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
Beat detection, Heart rate, Patch ECG, R-peaks, Remote health monitoring, Telemonitoring, Electrocardiography, Microelectronics, Telemedicine, Heart rates, Tele-monitoring, Signal detection
National Category
Other Medical Engineering Medical Laboratory and Measurements Technologies Signal Processing Medical Equipment Engineering
Identifiers
urn:nbn:se:mdh:diva-45016 (URN)10.23919/MIPRO.2019.8756769 (DOI)2-s2.0-85070300696 (Scopus ID)9789532330984 (ISBN)
Conference
42nd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2019, 20 May 2019 through 24 May 2019
Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-15Bibliographically approved
Trobec, R., Jan, M., Lindén, M. & Tomasic, I. (2019). Detection and Treatment of Atrial Irregular Rhythm with Body Gadgets and 35-channel ECG. In: 2019 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2019 - Proceedings: . Paper presented at 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2019, 20 May 2019 through 24 May 2019 (pp. 301-308). Institute of Electrical and Electronics Engineers Inc.
Open this publication in new window or tab >>Detection and Treatment of Atrial Irregular Rhythm with Body Gadgets and 35-channel ECG
2019 (English)In: 2019 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2019 - Proceedings, Institute of Electrical and Electronics Engineers Inc. , 2019, p. 301-308Conference paper, Published paper (Refereed)
Abstract [en]

The atrial irregular rhythm, often reflected in atrial fibrillation, undulation or flutter, is recognized as one of the major causes of brain stroke and entails an increased risk of thromboembolic events because it increases the likelihood of blood clots formation. Its early detection is becoming an increasingly important preventive measure. The paper presents a simple methodology for the detection of atrial irregular rhythm by ECG body gadget that can perform long-term measurements, e.g. several weeks or more. Multichannel ECG, on the body surface, gives a more detailed insight into the atrial activity in comparison to standard 12-lead ECG. The information from MECG is compared with single-channel patch ECG. The obtained results suggest that the proposed methodology could be useful in treatments of atrial irregular rhythm. One can obtain a reliable information about the time and duration of fibrillation events, or determine arrhythmic focuses and conductive pathways in heart atria, or study the effects of antiarrhythmic drugs on existing arrhythmias and on an eventual development of new types of arrhythmias. 

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc., 2019
Keywords
Atrial rhythm, Body surface potential map, ECG body sensor, Gadget, Patch ECG, Microelectronics, Antiarrhythmic drug, Atrial fibrillation, Body sensors, Body surface potential maps, Long-term measurements, Preventive measures, Electrocardiography
National Category
Other Medical Engineering Cardiac and Cardiovascular Systems Biomedical Laboratory Science/Technology Medical Laboratory and Measurements Technologies
Identifiers
urn:nbn:se:mdh:diva-45017 (URN)10.23919/MIPRO.2019.8756779 (DOI)2-s2.0-85070287718 (Scopus ID)9789532330984 (ISBN)
Conference
42nd International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2019, 20 May 2019 through 24 May 2019
Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-15Bibliographically approved
Petrovic, N., Tomasic, I., Lindén, M. & Risman, P. O. (2019). Detection of Human Bodypart Abnormalities by Microwaves – A New Approach. In: 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics MIPRO 2019: . Paper presented at 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics MIPRO 2019, 20 May 2019, Opatija, Croatia (pp. 270-274).
Open this publication in new window or tab >>Detection of Human Bodypart Abnormalities by Microwaves – A New Approach
2019 (English)In: 42nd International Convention on Information and Communication Technology, Electronics and Microelectronics MIPRO 2019, 2019, p. 270-274Conference paper, Published paper (Refereed)
Abstract [en]

We present modified antenna-like devices - applicators - for direct detection of internal inhomogeneities such as breast tumours and brain haemorrhages, at a frequency about 1 GHz. This direct detection provides the possibility of using a simple microwave generator and simple rectification and position registration of the received signals. Direct readouts are thus possible, without any massive computing resources as with tomographic imaging. The transmitting applicator is non-contacting and in free air close to the object. It generates an essentially quasistatic axial magnetic field which induces a circular electric field in the tissue. The receiving 3D contacting applicator contains a high-permittivity ceramic and is resonant. Its mode field provides the desired polarisation sensitivity and filters out the main electric field. The overall system sensitivity for detection of internal inhomogeneities is accomplished by optimised use of the orthogonality of the primary magnetic, induced electric, and diffracted electric fields. When developments are completed, the system will replace or complement existing commercial technologies at a low cost.

National Category
Engineering and Technology Computer Systems
Identifiers
urn:nbn:se:mdh:diva-43939 (URN)10.23919/MIPRO.2019.8757093 (DOI)2-s2.0-85070266490 (Scopus ID)
Conference
42nd International Convention on Information and Communication Technology, Electronics and Microelectronics MIPRO 2019, 20 May 2019, Opatija, Croatia
Projects
ESS-H - Embedded Sensor Systems for Health Research Profile
Available from: 2019-06-20 Created: 2019-06-20 Last updated: 2019-08-15Bibliographically approved
Tomasic, I., Rashkovska, A., Trobec, R. & Lindén, M. (2019). The implications of the lead theory on the patch ECG devices positioning and measurement. In: IFMBE Proceedings: . Paper presented at World Congress on Medical Physics and Biomedical Engineering, WC 2018, 3 June 2018 through 8 June 2018 (pp. 693-696). Springer Verlag (1)
Open this publication in new window or tab >>The implications of the lead theory on the patch ECG devices positioning and measurement
2019 (English)In: IFMBE Proceedings, Springer Verlag , 2019, no 1, p. 693-696Conference paper, Published paper (Refereed)
Abstract [en]

Currently we are witnessing fast development of patch ECG devices, some of which have already been extensively evaluated and shown to be useful for detecting arrhythmias. The research about using the patch ECG devices for purposes other than arrhythmia detection has been scarce. The efficiency of patch electrocardiography for a specific purpose can depend on the devices location on the body surface. It is still an open question where to position the ECG patch devices, and should the position depend on the specific purpose and perhaps even be personalized. We present the lead theory of differential leads (ECG leads obtained by patch ECG devices) and discuss its implications on the patch ECG devices positioning on the body surface.

Place, publisher, year, edition, pages
Springer Verlag, 2019
Keywords
Bipolar lead, Differential lead, ECG, Electrocardiography, Lead theory, Patch monitors, Remote monitoring, Telemonitoring, Biomedical engineering, Arrhythmia detection, Body surface, ECG devices, Ecg patches, Tele-monitoring
National Category
Computer and Information Sciences
Identifiers
urn:nbn:se:mdh:diva-39976 (URN)10.1007/978-981-10-9035-6_128 (DOI)000450908300128 ()2-s2.0-85048259555 (Scopus ID)
Conference
World Congress on Medical Physics and Biomedical Engineering, WC 2018, 3 June 2018 through 8 June 2018
Available from: 2018-06-21 Created: 2018-06-21 Last updated: 2018-12-06Bibliographically approved
Gardasevic, G., Fotouhi, H., Tomasic, I., Vahabi, M., Björkman, M. & Lindén, M. (2018). A Heterogeneous IoT-based Architecture for Remote Monitoring of Physiological and Environmental Parameters. In: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST, Volume 225: . Paper presented at 4th EAI International Conference on IoT Technologies for HealthCare HealthyIOT'17, 24 Oct 2017, Angers, France (pp. 48-53).
Open this publication in new window or tab >>A Heterogeneous IoT-based Architecture for Remote Monitoring of Physiological and Environmental Parameters
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2018 (English)In: Lecture Notes of the Institute for Computer Sciences, Social-Informatics and Telecommunications Engineering, LNICST, Volume 225, 2018, p. 48-53Conference paper, Published paper (Refereed)
Abstract [en]

A heterogeneous Internet of Things (IoT) architecture for remote health monitoring (RHM) is proposed, that employs Bluetooth and IEEE 802.15.4 wireless connectivity. The RHM system encompasses Shimmer physiological sensors with Bluetooth radio, and OpenMote environmental sensors with IEEE 802.15.4 radio. This system architecture collects measurements in a relational database in a local server to implement a Fog node for fast data analysis as well as in a remote server in the Cloud. 

National Category
Medical Engineering
Identifiers
urn:nbn:se:mdh:diva-37078 (URN)10.1007/978-3-319-76213-5_7 (DOI)000476922000007 ()2-s2.0-85042550307 (Scopus ID)9783319762128 (ISBN)
Conference
4th EAI International Conference on IoT Technologies for HealthCare HealthyIOT'17, 24 Oct 2017, Angers, France
Projects
ESS-H - Embedded Sensor Systems for Health Research ProfileREADY - Research Environment for Advancing Low Latency Internetecare@homeFuture factories in the Cloud
Available from: 2017-10-31 Created: 2017-10-31 Last updated: 2019-08-08Bibliographically approved
Trobec, R., Tomasic, I., Rashkovska, A., Depolli, M. & Avbelj, V. (2018). Commercial ECG systems. In: SpringerBriefs in Applied Sciences and Technology: (pp. 101-114). Springer Verlag (9783319593388)
Open this publication in new window or tab >>Commercial ECG systems
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2018 (English)In: SpringerBriefs in Applied Sciences and Technology, Springer Verlag , 2018, no 9783319593388, p. 101-114Chapter in book (Refereed)
Abstract [en]

Besides the standard 12-lead ECG and the Holter monitor, today the market offers a wide range of modern ECG devices and services supported by the latest developments in ICT. This chapter is devoted to the current state-of-the-art from the area of ECG with a reduced number of leads. We focus on ECG wireless body sensors, differentiating between those that measure only heart rate and are used just for entertainment or during sport activities, and those that actually measure and analyze the ECG signal, with all its waveforms. The latter are elaborated in more detail, particularly our differential ECG sensor and its commercial version Savvy, for which we provide also a comprehensive comparison to other state-of-the-art sensors in that field. It is, however, inevitable that the state-of-the art will change in the future. The constant progress in ICT will always drive the development of new and improved ECG devices. 

Place, publisher, year, edition, pages
Springer Verlag, 2018
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-36188 (URN)10.1007/978-3-319-59340-1_6 (DOI)2-s2.0-85024504418 (Scopus ID)978-3-319-59338-8 (ISBN)
Available from: 2017-08-10 Created: 2017-08-10 Last updated: 2017-08-10Bibliographically approved
Tomasic, I., Tomasic, N., Trobec, R., Krpan, M. & Kelava, T. (2018). Continuous remote monitoring of COPD patients-justification and explanation of the requirements and a survey of the available technologies. Medical and Biological Engineering and Computing, 56(4), 547-569
Open this publication in new window or tab >>Continuous remote monitoring of COPD patients-justification and explanation of the requirements and a survey of the available technologies
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2018 (English)In: Medical and Biological Engineering and Computing, ISSN 0140-0118, E-ISSN 1741-0444, Vol. 56, no 4, p. 547-569Article, review/survey (Refereed) Published
Abstract [en]

Remote patient monitoring should reduce mortality rates, improve care, and reduce costs. We present an overview of the available technologies for the remote monitoring of chronic obstructive pulmonary disease (COPD) patients, together with the most important medical information regarding COPD in a language that is adapted for engineers. Our aim is to bridge the gap between the technical and medical worlds and to facilitate and motivate future research in the field. We also present a justification, motivation, and explanation of how to monitor the most important parameters for COPD patients, together with pointers for the challenges that remain. Additionally, we propose and justify the importance of electrocardiograms (ECGs) and the arterial carbon dioxide partial pressure (PaCO2) as two crucial physiological parameters that have not been used so far to any great extent in the monitoring of COPD patients. We cover four possibilities for the remote monitoring of COPD patients: continuous monitoring during normal daily activities for the prediction and early detection of exacerbations and life-threatening events, monitoring during the home treatment of mild exacerbations, monitoring oxygen therapy applications, and monitoring exercise. We also present and discuss the current approaches to decision support at remote locations and list the normal and pathological values/ranges for all the relevant physiological parameters. The paper concludes with our insights into the future developments and remaining challenges for improvements to continuous remote monitoring systems.

Place, publisher, year, edition, pages
SPRINGER HEIDELBERG, 2018
National Category
Medical Engineering
Identifiers
urn:nbn:se:mdh:diva-38922 (URN)10.1007/s11517-018-1798-z (DOI)000427851600002 ()29504070 (PubMedID)2-s2.0-85042753818 (Scopus ID)
Available from: 2018-04-05 Created: 2018-04-05 Last updated: 2018-09-19Bibliographically approved
Trobec, R., Tomasic, I., Rashkovska, A., Depolli, M. & Avbelj, V. (2018). ECG pilot studies. In: SpringerBriefs in Applied Sciences and Technology: (pp. 61-75). Springer Verlag (9783319593388)
Open this publication in new window or tab >>ECG pilot studies
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2018 (English)In: SpringerBriefs in Applied Sciences and Technology, Springer Verlag , 2018, no 9783319593388, p. 61-75Chapter in book (Refereed)
Abstract [en]

The use of wireless ECG body sensors in two pilot studies is presented. The first study, running at the Department of Cardiovascular Surgery of the University Medical Centre Ljubljana, is focused on the investigation of postoperative atrial fibrillation. The patients are monitored with wireless ECG body sensors one day before and five days after the surgery. The second study has been established at the primary care level in the Community Health Centre Ljubljana, with the intention to establish heart rhythm screening. As both studies are still in progress, we present just their setup and some interesting findings that emerged in their starting phase. Based on evidences from long-term ECG measurements, we identify several still open ECG research questions that could utilize the vast amount of long ECG recordings obtained from the pilot studies. 

Place, publisher, year, edition, pages
Springer Verlag, 2018
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-36186 (URN)10.1007/978-3-319-59340-1_4 (DOI)2-s2.0-85024479927 (Scopus ID)978-3-319-59338-8 (ISBN)
Available from: 2017-08-10 Created: 2017-08-10 Last updated: 2017-08-10Bibliographically approved
Tomasic, I., Khosraviani, K., Rosengren, P., Jornten-Karlsson, M. & Lindén, M. (2018). Enabling IoT based monitoring of patients' environmental parameters: Experiences from using OpenMote with OpenWSN and Contiki-NG. In: 2018 41st International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2018 - Proceedings: . Paper presented at 41st International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2018, 21 May 2018 through 25 May 2018 (pp. 330-334).
Open this publication in new window or tab >>Enabling IoT based monitoring of patients' environmental parameters: Experiences from using OpenMote with OpenWSN and Contiki-NG
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2018 (English)In: 2018 41st International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2018 - Proceedings, 2018, p. 330-334Conference paper, Published paper (Refereed)
Abstract [en]

Remote health monitoring can be leveraged by the IoT paradigm. We tested OpenMotes, state-of-the-art IoT devices featuring IEEE 802.15.4 protocol, with Contiki-NG and OpenWSN, two of the most popular IoT operating systems, for the purpose of obtaining data from the OpenMote's sensors. The procedure is not strait forward and requires additional programing of the operating systems. All the steps necessary to make the OpenMote work with Contiki-NG are presented in detail. We also describe how to use Copper Firefox add-on to access the sensors data over CoAP, as well as how to design a functional web interface in Node-RED for the sensors data. 

National Category
Medical Engineering
Identifiers
urn:nbn:se:mdh:diva-40365 (URN)10.23919/MIPRO.2018.8400063 (DOI)2-s2.0-85050245897 (Scopus ID)9789532330977 (ISBN)
Conference
41st International Convention on Information and Communication Technology, Electronics and Microelectronics, MIPRO 2018, 21 May 2018 through 25 May 2018
Available from: 2018-08-17 Created: 2018-08-17 Last updated: 2018-08-17Bibliographically approved
Trobec, R., Tomasic, I., Rashkovska, A., Depolli, M. & Avbelj, V. (2018). Final remarks and conclusions. In: SpringerBriefs in Applied Sciences and Technology: (pp. 115-119). Springer Verlag (9783319593388)
Open this publication in new window or tab >>Final remarks and conclusions
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2018 (English)In: SpringerBriefs in Applied Sciences and Technology, Springer Verlag , 2018, no 9783319593388, p. 115-119Chapter in book (Refereed)
Abstract [en]

The content of our book, devoted to body sensors and their implications to electrocardiography, is recapitulated with this chapter. The identified challenges in long-term ECG data analytics are discussed. Based on the presented material, the near future of mHealth perspectives is foreseen regarding the technology, the usability, and the potential of increased users’ awareness for their own health. 

Place, publisher, year, edition, pages
Springer Verlag, 2018
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:mdh:diva-36183 (URN)10.1007/978-3-319-59340-1_7 (DOI)2-s2.0-85024489784 (Scopus ID)978-3-319-59338-8 (ISBN)
Available from: 2017-08-10 Created: 2017-08-10 Last updated: 2017-08-10Bibliographically approved
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