Milan Tysler

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The effect of electrode displacement as one of the sources of reproducibility errors in body surface potential maps was studied using a realistic computer model of the cardiac electric field. A uniform dipole layer model of the cardiac generator and a realistic geometry of the torso, heart, and lungs was adopted for the simulation of surface potentials(More)
Portable device for multi-channel ECG measurement and body surface potential (BSP) mapping is introduced and its possible application for cardiac diagnostic is presented. The device is designed for simultaneous measurement of up to 144 body surface potentials relatively to a relocatable reference electrode. Use of active electrodes, driven grounding(More)
One of the main difficulties in using body surface potential mapping (BSPM) techniques is the need of complicated multi-channel measuring system. In this paper practical portable ECG mapping system is introduced. The system consists of a notebook computer and a data acquisition system box connected to the computer by fast IEEE 1284 parallel interface(More)
Electrogastrogram (EGG) is a noninvasive recording of the electrical activity of the stomach. Dominant component of gastric electrical activity called also slow waves originates from the activity of the network of interstitial cells of Cajal located in the gastric wall. The electrogastrographic signal requires longer recording times (usually tens of(More)
BACKGROUND The purpose of this study was to observe the influence of variety in individual torso geometries on the results of inverse solution to 2 dipoles. METHODS The inverse solution to 2 dipoles was computed from the measured data on 8 patients using either standard torso with various shapes and sizes of the heart and lungs in it or using various(More)
A method using body surface potential maps for assessment of myocardium lesions with changed repolarization is presented and suitable mapping system is introduced. Differences between normal and altered QRST integral maps together with torso volume conductor model were used to determine the equivalent dipole representing the lesion. Performance of the(More)
PURPOSE We studied the implementation of a patient-specific torso model created without the use of magnetic resonance imaging in the inverse problem of electrocardiology. METHOD Three types of inhomogeneous numerical torso models were created, with different degrees of adjustment of the outer surface to patients, whereas the heart and lung models remained(More)
The aim of the simulation study was to identify cases in which an inverse solution to two dipoles characterizes the existence of two simultaneous lesions with changed repolarization. Difference STT integral body surface potential maps computed for 48 single lesions and 96 pairs of lesions were used as the input data for an inverse solution to two dipoles.(More)