摘要
单次提取兔体感诱发电位,并定位和分析诱发电位波形成分.麻醉兔,以0.5 Hz频率电脉冲刺激兔下肢隐神经,3 764 Hz采样频率收集兔头皮电位.采用一维多分辨分析提取兔体感诱发电位,并用连续小波变换定位和分析诱发电位波形成分.单次诱发电位的小波变换与叠加平均诱发电位比较表明,Daubechies小波多分辨分析可以单次提取诱发电位.连续小波变换能够精确定位诱发电位中波形成分,并可采用连续小波变换分析诱发成分的频域特性.连续小波变换技术把一维时域信号投影到二维时频空间研究将成为医学信号处理的一个有用方法.
To extract rabbit somatosensory evoked potential （SEP）, the authors locate waveform of rabbit SEP and analyze it. The rabbit was narcotized and stimulated by 0.5 Hz electric pulse. Potential of scalp was sampled at 3 764 Hz. Rabbit somatosensory evoked potential was extracted by one-dimension multi-resolution analysis, and continuous wavelet transform （CWT） was employed to locate and analyze the wave of SEP. The results show that Single-trail SEP can be extracted by Daubechies wavelet, when compared wavelet transform result of single-trail with result of averaged SEP. Wave component of SEP can be located precisely through the method of continuous wavelet transform. Frequency feature of SEP can also be analyzed by CWT. The technique of continuous wavelet transform, which can project a one-dimension signal into a two-dimension time-frequency space, will become a useful method to process medical electronic signal.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2006年第3期119-123,共5页
Journal of Chongqing University
基金
国家自然科学基金资助项目(60471041)
重庆医科大学创新基金资助项目(CX200202)
重庆邮电学院科学基金资助项目(A2004-61)
关键词
体感诱发电位
小波变换
单次提取
多分辨分析
快速傅里叶变换
somatosensory evoked potential
wavelet transform
single-trial
multi-resolution analysis
fast Fourier transform
