Biological signal analysis by wavelets. / Análise de sinais biológicos utilizando wavelets.

AUTOR(ES)

Franco Beltrame Runza

DATA DE PUBLICAÇÃO

2001

RESUMO

The analysis of myoelectric signals from the gastro-intestinal tube of laboratory animals (mice), recorded by chronically implanted electrodes, is a key stone in understanding the disorders associated to the digestive system. This analysis meets considerable difficulties when done by classical methods, specially those based in the Fourier transform. The many myoelectric components interactions makes the following of these signals along the digestive tract and the retrieval of typical parameters (such as the propagation velocity between electrodes) a very complicated and laborious task. Here is studied a newer and more promising alternative: the Wavelet transform. Using this mathematical tool, it becomes possible to obtain a better time-frequency resolution of the studied signals, allowing to find patterns related to the signal propagation even in noisy and multifrequencial readings. 82 readings from 9 normal animals belonging to the Medical Investigation Laboratory of the Medicine Faculty of University of São Paulo were analyzed, becoming feasible to determine two parameters: the mean propagation velocity between electrodes (about 1.2 cm/s) and the main components of the basal frequency (0.63 e 0.65 Hz).

ASSUNTO(S)

tubo digestivo gastrointestinal signal analysis wavelets digestive tract análise de sinais

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