Abstract：
:Somatosensory evoked potential (SEP) testing has been widely applied to diagnosis of various neurological disorders. However, SEP recorded using surface electrodes is buried in noises, which makes the signal-to-noise ratio (SNR) very poor. Conventional averaging method usually requires up to thousands of raw SEP input trials to increase the SNR so that an identifiable waveform can be produced for latency and amplitude measurement. In this study, a multi-adaptive filtering (MAF) technique, emerging from the combination of well-developed adaptive noise canceller and adaptive signal enhancer, is introduced for fast and accurate surface SEP extraction. The MAF technique first processes the raw surface recorded SEP by the Canceller with a reference noise channel of background noise for adaptive subtraction before entering the Enhancer. The MAF was verified by filtering simulated SEP signals in which electroencephalography and Gaussian noise of different SNRs were added. It was found that the MAF could effectively suppress the noise and enhance the SEP components such that the SNR of the SEP is improved. Results showed that MAF with 50 input trials could provide similar performance in SEP detection to those extracted by the conventional averaging method with 1000 trials even at an SNR of -20 dB.
journal_name
Med Eng Physjournal_title
Medical engineering & physicsauthors
Lam BS,Hu Y,Lu WW,Luk KD,Chang CQ,Qiu W,Chan FHdoi
10.1016/j.medengphy.2004.09.007subject
Has Abstractpub_date
2005-04-01 00:00:00pages
257-66issue
3eissn
1350-4533issn
1873-4030pii
S1350-4533(04)00173-0journal_volume
27pub_type
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