THE WAVELET ANALYSISOF EVOKED POTENTIALS  

THE APPLIED STUDY OF THE TOTAL HIP REPLACEMENT FOR THE ADULT'S CONGENITAL DISLOCATION OF THE HIP AT THE PRIMARY ACETABULUM

作　　者：Li Guan Dazong Jiang(Biomedical Engineering Research institute,Xi’ an Jiaotong University) 

出　　处：《Chinese Journal of Biomedical Engineering(English Edition)》1995年第4期212-212,共1页中国生物医学工程学报（英文版）

摘　　要：Abstract: In this paper,we use the orthogonal wavelet based on 3-order splines function to processthe somatosensory evoked potentials and cognitive event-related potentials. The experiments onhuman subjects have showed that this method is valuable and practicable.INTRODUCTIONEvoked potentials(EP' s) are electrical responses of the central nervous system to stimulusapplied in a controlled manner. They can not only be used to diagnose the diseases on the sensorypathway and brain but also be frequently monitored intraoperatively to assess the effects ofsurgery or to detect unexpected neurological injury [1][2]. But the Signal-to-Noise ratios (SNRIs) of EP' s are vary low. The: are many methods in order to improve the SNR' S and identify theEP' s signal perfectly with less stimuli such as ensembl averaging,post-wiener filtering,adaptedfiltering and parametric modeling and even single stimulus. The purpose of this paper is to applyrnultiresolution wavelet analysis method for identification of short-latency somatosensory evokedpotentials and long-latency evoked--related potentials.METHODMultiresolution Wavelet analysis and pyramid algorithm was constructed by Mallat [3] andwidely used in signal processing pattern recognition and image processing. Here,we applyed thisto decompose EP' S signal into different frequency bands and reconstructed them with time-varying weight method.Based on 3-order splines functions,we constructed orthogonal wavelet and scale function. According to the dual-scale function,we could get transform function h and its mirror filter g,theyare related by gn(- l)nhn+1. More detail could see Mallat' theory[3]. Through fast pyramid algorithm,the EP' S signal can be decomposed into detail and coarse parts on a dyadic scales by scalefunction like this Here Cj is coarse signal and Dj is detail signal. C, is signal on scale 0 and is the same as originalsignal. With j increasing,the EP' S signal were projected to different frequency bands. The reconstructed function for signal on j scale to j-1 scale isAccＴＨＥＡＰＰＬＩＥＤＳＴＵＤＹＯＦＴＨＥＴＯＴＡＬＨＩＰＲＥＰＬＡＣＥＭＥＮＴＦＯＲＴＨＥＡＤＵＬＴ＇ＳＣＯＮＧＥＮＩＴＡＬＤＩＳＬＯＣＡＴＩＯＮＯＦＴＨＥＨＩＰＡＴＴＨＥＰＲＩＭＡＲＹＡＣＥＴＡＢＵＬＵＭＴＨＥＡＰＰＬＩＥＤＳＴＵＤＹＯＦＴＨＥＴＯ...

关 键 词：HIP THE APPLIED STUDY OF THE TOTAL HIP REPLACEMENT FOR THE ADULT’S TOTAL CONGENITAL DISLOCATION OF THE HIP AT THE PRIMARY ACETABULUM AT 

分 类 号：R318.01[医药卫生—生物医学工程]