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Delineation of ECG signals using phasor transform
Koupil, Michal ; Vítek, Martin (referee) ; Maršánová, Lucie (advisor)
TThis project deals with delineation of ECG signals using phasor transform. This method is rather new in the field of automatic delineation of ECG and it is not widely used in practice yet. In the theoretical part, the relation between heart activity and ECG is described. A phasor transform is also described. In the practical part, a program was implemented in the computing environment of MATLAB. Its purpose is to delineate the signals. At first, it detects waves’ peaks, then its beginning and starting points. In the next part, analysis of the results is done, as well as comparison with other authors. The testing was performed on the QT signals from the Physionet database.
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Experimental data processing in real time
Veselý, Petr ; Harabiš, Vratislav (referee) ; Kolářová, Jana (advisor)
The thesis completes the current programming equipment for experimental measurement of isolated animal heart signals. It adds a block providing the pre-processing of the signals. The signals measured are the elektrogram (EG) and the action potential (AP). The origin of individual signals, the measuring method and the possibilities of noise elimination are dealt with in the theoretical part of the thesis. The practical part describes the pre-processing block securing the noise elimination during the AP. It uses accumulative methods of averaging the corresponding time periods of the AP. Based on the results of measuring the signal to noise ratio, the thesis suggests the most appropriate accumulative methods and their variables. In order for the chosen accumulative methods to work well, it is important to divide the AP process into sectors of corresponding shape (repeats). The connection between the EG and AP processes is used to determine the beginning and end of the sectors. These points are identified by the detection of R and T wave peaks in the EG. To detect the R and T waves, the thesis uses methods based on wavelet transform. The efficiency and accuracy of detection methods is verified by test EG signals with hand-marked R and T wave peaks.
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Automatic delineation of ECG signals
Tiurina, Mariia ; Kozumplík, Jiří (referee) ; Vítek, Martin (advisor)
This semester’s thesis deals about delineation ECG signals. Semester work consists of two parts. The theoretical part provides a brief introduction to the principles of electrocardiography, sensing methods electrocardiography recording and description of some well-known methods for seasons auto electrocardiographic signals. The practical part is a program that is implemented in programming environment Matlab and the results of its testing twelve lead signals from the CSE database. Using statistical methods, the results are compared with the results of the listed authors methods
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Multilead decision rules in delineation of ECG signals
Richter, Zdeněk ; Smital, Lukáš (referee) ; Vítek, Martin (advisor)
This work deals with ECG signal measuring and methods of its processing. It compares some of the QRS detection methods and describes some of the testing databases. In this work a detector of QRS complex is realized, it is based on the approach of zero crossings. Next section makes combination of results from separate leads to one, which improves efficiency of detection. One section of this work deals with design and realization delination of ECG signal. In the last part outputs of this delineation are compared with the results of the other authors.
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Delineation of ECG signals using phasor transform
Koupil, Michal ; Vítek, Martin (referee) ; Maršánová, Lucie (advisor)
TThis project deals with delineation of ECG signals using phasor transform. This method is rather new in the field of automatic delineation of ECG and it is not widely used in practice yet. In the theoretical part, the relation between heart activity and ECG is described. A phasor transform is also described. In the practical part, a program was implemented in the computing environment of MATLAB. Its purpose is to delineate the signals. At first, it detects waves’ peaks, then its beginning and starting points. In the next part, analysis of the results is done, as well as comparison with other authors. The testing was performed on the QT signals from the Physionet database.
|
|
|
Automatic delineation of ECG signals
Tiurina, Mariia ; Kozumplík, Jiří (referee) ; Vítek, Martin (advisor)
This semester’s thesis deals about delineation ECG signals. Semester work consists of two parts. The theoretical part provides a brief introduction to the principles of electrocardiography, sensing methods electrocardiography recording and description of some well-known methods for seasons auto electrocardiographic signals. The practical part is a program that is implemented in programming environment Matlab and the results of its testing twelve lead signals from the CSE database. Using statistical methods, the results are compared with the results of the listed authors methods
|
|
|
Multilead decision rules in delineation of ECG signals
Richter, Zdeněk ; Smital, Lukáš (referee) ; Vítek, Martin (advisor)
This work deals with ECG signal measuring and methods of its processing. It compares some of the QRS detection methods and describes some of the testing databases. In this work a detector of QRS complex is realized, it is based on the approach of zero crossings. Next section makes combination of results from separate leads to one, which improves efficiency of detection. One section of this work deals with design and realization delination of ECG signal. In the last part outputs of this delineation are compared with the results of the other authors.
|
|
|
Experimental data processing in real time
Veselý, Petr ; Harabiš, Vratislav (referee) ; Kolářová, Jana (advisor)
The thesis completes the current programming equipment for experimental measurement of isolated animal heart signals. It adds a block providing the pre-processing of the signals. The signals measured are the elektrogram (EG) and the action potential (AP). The origin of individual signals, the measuring method and the possibilities of noise elimination are dealt with in the theoretical part of the thesis. The practical part describes the pre-processing block securing the noise elimination during the AP. It uses accumulative methods of averaging the corresponding time periods of the AP. Based on the results of measuring the signal to noise ratio, the thesis suggests the most appropriate accumulative methods and their variables. In order for the chosen accumulative methods to work well, it is important to divide the AP process into sectors of corresponding shape (repeats). The connection between the EG and AP processes is used to determine the beginning and end of the sectors. These points are identified by the detection of R and T wave peaks in the EG. To detect the R and T waves, the thesis uses methods based on wavelet transform. The efficiency and accuracy of detection methods is verified by test EG signals with hand-marked R and T wave peaks.
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