Enhancement of the acquisition speed of somatosensory evoked potentials by a response tuned wavelet filter

H. L. Journee, P. E. van der Worp, E. Zeinstra, A. Buchthal, J. J.A. Mooij

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    1 Citaat (Scopus)

    Samenvatting

    A pilot study was performed to see how much a Wavelet Transform (WT) based filter can reduce the recording time of intra-operative monitored somatosensory evoked potentials (SSEP) from contralateral median nerve stimulation. The designed filtering technique used a coefficient mask that was obtained from a WT of a completed SSEP response (n = 500) that was overlaid on the time-scale coefficients of responses of individual subsums (n = 25) before the signals underwent back transformation. The efficacy of the WT-filter was judged numerically by comparing the number of coefficients from the subsums with the number of coefficients of a completed response (threshold: 0.05 of the largest efficient) Different Daubechies orthonormal wavelets (D4 - D20) were examined. The completed SSEP response could be recognized in many of the WT-filtered subsums plots. The best results are obtained from wavelets between D12-D20. The reduction of the number of coefficients by the WT filter varied between 1/3 to 1/9 which predicts a reduction of the recording time by 30 to 70 percent, compared to conventional averaging.
    Originele taal-2English
    Aantal pagina's2
    DOI's
    StatusPublished - 1995

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