Techniky zpracování plodové fonokardiografie

Abstract

This thesis deals with extraction of fetal phonocardiogram (fFKG) from the recorded signals acquired on the abdominal area of the mother with a non-invasive sensor using the proposed software solution. The abdominal phonocardiogram (aFKG) consists of a mixture of fFKG, maternal (mFKG) and noise in the form of mother and fetal movements, organ sounds and external sounds. The thesis describes first the theory of the development of the fetus and its heart. Then, the research describes all the methods by which fFKG can be extracted and algorithms of the selected methods are described. The proposed system is based on FIR filtering and wavelet transformation (WT) and primarily focuses on determining fetal heart rate (fHR) and plotting the fHR waveforms. Functionality of this software system is tested on synthetic records and real records from databases. Quality assessment is performed by determining fHR and SNR.