The Weighting Median Filter Baseline (WMFB) Method

Source

[5] Boudet, S., Houzé de l’Aulnoit, A., Demailly, R., Peyrodie, L., Beuscart, R., Houzé de l’Aulnoit,D. - Fetal heart rate baseline computation with a weighted median filter. Computers in biology and medicine. 2019 Nov 1;114:103468. DOI:10.1016/j.compbiomed.2019.103468 Download on researchgate

Method

This method has been developped by the authors of this website. It consists in computing a weighted median filter baseline (WMFB) and then in detecting accelerations and decelerations (A/D) accordingly.The filter weightings are based on the prior probability that the sampled FHR is in the baseline state or in an A/D state. This probability is computed by estimating the signal's stability at low frequencies and by progressively trimming the signal.

    USAGE:
       [baseline,accelerations,decelerations]=aamwmfb(FHR)
    INPUT:
       FHR       : Fetal Heart Rate sampled at 4Hz already pre-processed (with no signal loss)
    OUTPUT:
       baseline  : the baseline signal at 4Hz
       accelerations : Table with begining and end of each accelerations in s in each column
       decelerations : Table with begining and end of each decelerations in s in each column

Online demonstration

Train dataset (include consensual expert analysis for comparison):

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Test dataset (consensual expert analysis is not shown):

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