Empirical Mode Decomposition (EMD) for multi-gate, multi-transducer Ultrasound Doppler fetal heart monitoring

Denis Rouvre (1) , Denis Kouamé (2, 1) , François Tranquart (3, 4) , Léandre Pourcelot (1)

1 LUSSI - Laboratoire Ultrasons Signaux et Instrumentation
2 IRIT-TCI - Traitement et Compréhension d’Images
3 Hôpital Bretonneau
4 INSERM - Institut National de la Santé et de la Recherche Médicale

This paper presents a new technique called empirical mode decomposition (EMD) applied to a multi-gate, multitransducer ultrasound Doppler system used for fetal heart monitoring. We propose this system as an alternative to the existing fetal monitoring techniques. Classical autocorrelation-based fetal heart rate (FHR) detection has been shown to be a good method to detect the FHR in normal situations. However, as this method is applied to magnitudes of the Doppler signal fails to estimate the fetal heart rate when the fetus moves. In view of the extent of FHR variability, a monitoring system should be able to estimate this parameter each time. We therefore propose empirical mode decomposition as an interesting alternative for long-term monitoring. The principle of this method consists of iterative decompositions of a signal into a sum of functions that have the same number of extrema, the same number of zero crossings, and are symmetric with respect to the local mean. When investigation of FHR using autocorrelation on the original Doppler signal fails due to fetal movement or low signal-to-noise ratio (SNR), it is frequently successful using the intrinsic mode functions (imfs). We compared the results of multi-transducer FHR detection with and without EMD decomposition using in-vivo Doppler signals from a set of 40 women between 32 and 38 weeks of pregnancy. This method greatly improved the quality of FHR detection.

Mots clés: fetal heart monitoring; empirical mode decomposition; multitransducer ultrasound Doppler system; autocorrelation-based fetal heart rate; iterative decompositions; signal-to-noise ratio; intrinsic mode functions; in-vivo Doppler signals; Empirical Mode Decomposition; Electronic fetal monitoring; Actifoetus

Domaines: Traitement du signal et de l'image [eess.SP]; Imagerie médicale

Denis Rouvre, Denis Kouamé, François Tranquart, Léandre Pourcelot. Empirical Mode Decomposition (EMD) for multi-gate, multi-transducer Ultrasound Doppler fetal heart monitoring. 5th IEEE International Symposium on Signal Processing and Information Technology (ISSPIT 2005), Dec 2005, Athène, Greece. pp.208-212, ⟨10.1109/ISSPIT.2005.1577097⟩. ⟨hal-03149789⟩