基于小波变换肺部气血阻抗分离及能量分析

Separation of Pulmonary Gas-Blood Bio-Impedance and Energy Analysis Based on Wavelet Transformation

肺部血管搏动信号与呼吸信号对于肺部疾病或心血管疾病的鉴定有重要意义,为了提取这2种信号,根据人体生物阻抗测量特点,设计了阻抗测量平台,可实现20,kHz和200,kHz的混频激励.针对测得的气血阻抗信号,利用小波变换实现了气血阻抗信息分离,结合能量分析法,气血变化规律可表征人体不同体位和呼吸状态,为肺部疾病的精确诊断奠定基础.

Pulmonary vascular throb signal and respiratory signal have important implications for the identification of lung disease and cardiovascular disease. In order to extract the two signals, according to human’s pulmonary bio-impedance characteristics, a measurement system was designed, which could realize 20 kHz and 200 kHz mixing fre-quency excitation. Wavelet transform was applied in the separation of respiratory and vascular throb bio-impedance signal. Using energy analysis method, different body positions and respiratory states could be characterized by the rule of respiratory and vascular throb information. The study in this paper lays the foundation for pulmonary function test-ing and accurate clinical diagnosis.