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Theses

Détection et analyse des signaux ultrasonores d'un dispositif Doppler multi-capteurs pour le suivi de l'activité fœtale

Abstract : The main purpose of this work is to develop tools allowing better analysis of the Doppler signals originating from the fetal activity. The thesis has been realized within the scope of a project RNTS (Réseau National des Technologies pour la Santé) called Actifoetus.
The study consists in processing the signals provided by 12 ultrasonic sensors placed on the maternal belly and connected to a multichannel pulsed Doppler unit developed by the company Ultrasons Technologies, Tours. Each sensor detects the Doppler signals produced by moving fetal structures from 5 successive depths in the maternal uterus.
The principal objective of the project was to extract the parameters reflecting the fetal activity (fetal heart rate and pseudo respiratory, movements of the members and the trunk, response to stimuli...) for the monitoring and the follow-up of the pregnancies.
The second step consists in using these parameters to define, the state of wellbeing or suffering of the fetus for an ambulatory monitoring of certain pregnancies at risk. This application in tele medicine will require the development of a portable system of Holter type.
The first part of the project consisted in participating in the final development of equipment and methods of data acquisition. The largest part of work was then devoted to the development and to the validation of the signal processing strategies of the recorded data on pregnancies from 20 to 30 weeks. These recordings allowed us to demonstrate the quality of the Doppler signals of fetal activity provided by the Actifoetus system, and to validate the use of the Fast Fourier Transform (FFT) and of the Autocorrelation Function (ACF) to detect the cardiac activity and the movements of the fetus. We also could show that the Independent Components Analysis (ICA) method is successful in separating a mixture of several Doppler signals.
The principal originality of work lies in the extraction of statistically relevant information concerning the movements and the rates/rhythms of the fetus starting from several ultrasonic sensors. The correlation of these data with the signals of mother activity (Accelerometer), or of neurosensor stimuli, should allow important clinical applications.
The project is conceived to lead to a marketable apparatus miniaturized starting from the prototype shown in this thesis. The aspects of industrial protection will be examined as well with regard to the apparatus Holter itself, and the algorithms of data processing and fusion.
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Contributor : Ali Kribeche <>
Submitted on : Friday, November 4, 2005 - 2:46:56 PM
Last modification on : Monday, January 27, 2020 - 1:58:04 PM
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Ali Kribeche. Détection et analyse des signaux ultrasonores d'un dispositif Doppler multi-capteurs pour le suivi de l'activité fœtale. Automatique / Robotique. Université François Rabelais, 2005. Français. ⟨tel-00010864⟩

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