The noise influence on determination dominant frequencies of EGG signal

Electrogastrographic examination (EGG) can be considered as a noninvasive method for an investigation of a stomach slow wave propagation. This paper presents a method for determining dominant frequencies. It also shows details of influence of a noise on dominant frequencies determination. The EGG signal is noninvasively captured by appropriately placed electrodes on the surface of the stomach. The typical range of frequency for EGG signal is from 0.015 Hz to 0.15 Hz. One of EGG signal analyzing method is based on a determination of dominant harmonic frequencies contained in the chosen segments of EGG signal. The dominant frequencies are used for calculation base parameters of the EGG signal.