基于小波变换的人血清血卟啉荧光光谱分析法

卟啉是生命活动的重要物质,原卟啉可做为肿瘤血液标志物.人血清中血卟啉含量很低,且受多种因素影响.基于小波变换的人血清血卟啉荧光光谱分析法可实现对其弱信号的分辨.用多功能光谱测量系统获取人血清血卟啉荧光光谱,对获取的荧光光谱通过数次小波变换进行分解,将噪声与光谱信号分离,滤波后的荧光光谱进行6次分解后得到了离散逼近信号(a1～a6)和离散细节信号(d1～d6).信号频率随着分解次数的增加逐步降低.当分解到第6次时,出现了血卟啉荧光特征峰,成功地观测到血卟啉的荧光发射峰,实现了弱信号分辨,得到了血清中所含血卟啉的准确成份和定量信息,从而进行定性和定量分析,为血清荧光光谱用于肿瘤的早期诊断提供了一种方法.

Fluorescence Spectrum Analysis System for Protoporphyrin Ⅸ in Serum Based on Wavelet Transform

Protoporphyrin IX is an important kind of organic compound for vital movement,and can be used as the sign of tumour blood.Human protoporphyrin IX content in serum is very low,and affected by various factors.The serum fluorescence spectrum analysis system based on wavelet transform was used to discriminated the protoporphyrin IX weak signals.The protoporphyrin IX fluorescence spectrum was obtained by a multi-function spectrum measuring system,and decomposed several times by wavelet transform to distinguish the noise and spectrum signals.The fluorescence spectrum can be divided into corresponding discrete approximations signals(a1-a6) and discrete details signals(d1-d6) by six times of decomposition,showing the signal frequency decreasing with decomposition times increasing and the protoporphyrin IX fluorescence character peak appears here.The weak signals were discriminated and the exactly component and quantity can be acquired for further analysis.So it can be analysed quantitatively.The researches in the present paper provide the potential application in the diagnosis of incipient tumous using the serum fluorescence spectrum.