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

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5 Author(s)
Journe, H.L. ; Dept. of Neurological Surg. & Anesthesiology, Univ. Hosp. Groningen, Netherlands ; van der Worp, P.E. ; Zeinstra, E. ; Buchthal, A.
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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 coefficient). Different Daubechies orthonormal wavelets (D4-D20) were examined. The completed SSEP response could be recognised 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

Published in:

Engineering in Medicine and Biology Society, 1995., IEEE 17th Annual Conference  (Volume:2 )

Date of Conference:

20-23 Sep 1995