發(fā)布時(shí)間：2018-03-12 08:29

  本文選題：胎心電　切入點(diǎn)：R波檢測　出處：《南京大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：目前,胎兒心電R波檢測技術(shù)還不成熟,尚不能滿足胎兒心電波形提取或胎兒瞬時(shí)心率計(jì)算的客觀要求。之所以如此,一個(gè)重要原因是,我們檢測的孕婦腹壁電信號,是一個(gè)比常規(guī)成人ECG信號復(fù)雜得多的混合信號,包含了母體心電成分、胎兒心電成分、還有其他干擾和噪聲等。概括起來,胎兒心電R波檢測存在的問題主要體現(xiàn)在兩方面：一、檢測的腹壁電信號的胎心電信噪比太低,在去除了母體心電成分的殘留信號中胎兒心電成分被埋沒在強(qiáng)背景噪聲中,難于正確檢測出胎兒心電R波波峰位置；二、檢測的腹壁電信號中母體心電成分過弱或者胎兒心電成分過強(qiáng),則母體心電成分的R波波峰不能直接正確檢測,最終又影響到胎兒心電成分的R波檢測。本論文就是面向上述兩方面的胎兒心電R波檢測問題開展研究,具體研究工作如下：(1)進(jìn)行實(shí)際孕婦腹壁電數(shù)據(jù)的檢測,構(gòu)建自己的孕婦腹壁電數(shù)據(jù)庫。(2)基于實(shí)測數(shù)據(jù),研究了電極如何布置才能使獲得的腹壁電信號有較高的胎心電信號信噪比的問題,找到了幾組電極布置的優(yōu)勢方向,得出了優(yōu)勢方向電極布置間距優(yōu)化的定性結(jié)論,并給出了解釋。(3)對個(gè)別檢測通道信號顯示出較高母體ECG信號信噪比的情況,容易正確檢測其母體R波波峰,可用此R波波峰檢測結(jié)果作為參考,幫助其他通道進(jìn)行母體R波波峰的正確檢測,即在參考位置的附近進(jìn)行局部搜索即可。由于局部自動(dòng)搜索需要一個(gè)范圍,為此,本文基于課題組實(shí)測數(shù)據(jù)和MIT Non-Invasive Fetal Electrocardiogram Database數(shù)據(jù),研究了各通道信號對應(yīng)R波波峰位置的差異規(guī)律,得出了差異范圍不超過30 ms的結(jié)論。(4)針對各通道胎心電普遍明顯進(jìn)而影響腹壁電母體R波波峰正確檢測的問題,一方面,優(yōu)化了單通道信號小波分解重構(gòu)方法,提高了單通道母體R波波峰正確檢測率；另一方面,提出了一個(gè)基于各通道R波檢測結(jié)果對多檢漏檢進(jìn)行融合判斷的方法,進(jìn)一步提高了母體R波波峰的檢測正確率。全文共分6章,第1章為緒論,第2-5章分別對應(yīng)以上4項(xiàng)工作,第6章給出了本文工作的總結(jié),并對下一步的工作給予了展望。
[Abstract]:At present, fetal ECG R wave detection technology is not mature and can not meet the objective requirements of fetal ECG waveform extraction or fetal instantaneous heart rate calculation. Is a mixture of signals that are much more complex than conventional adult ECG signals, including maternal ECG, fetal ECG, and other disturbances and noises. The problems of fetal ECG R wave detection are mainly reflected in two aspects: first, the fetal ECG signal to noise ratio of the detected abdominal wall electrical signal is too low, in removing the residual signals of maternal ECG components, fetal ECG components are buried in strong background noise. It is difficult to correctly detect the position of the peak of fetal ECG R wave. Secondly, if the maternal ECG component is too weak or the fetal ECG component is too strong, the R wave peak of the maternal ECG component can not be detected directly and correctly. This paper is aimed at the above two aspects of fetal ECG R wave detection research, the specific research work is as follows: 1) the actual pregnant women's abdominal wall electrical data detection. Based on the measured data, this paper studies how to arrange the electrodes in order to make the obtained abdominal wall electrical signals have higher signal-to-noise ratio (SNR) of fetal ECG signals, and find out the superior directions of several groups of electrodes. The qualitative conclusion of optimizing the spacing of dominant direction electrode arrangement is obtained, and the explanation is given. The signal to noise ratio (SNR) of individual detection channel signal is higher than that of parent ECG signal, and it is easy to detect the R wave peak of parent body correctly. We can use this R wave peak detection result as a reference to help other channels to detect the parent R wave peak correctly, that is, to make a local search near the reference position. Based on the measured data and MIT Non-Invasive Fetal Electrocardiogram Database data, the differences of the position of the R wave peak corresponding to each channel signal are studied in this paper. The conclusion that the range of difference is not more than 30 Ms is obtained. Aiming at the problem that every channel fetal ECG is obviously obvious and then affecting the correct detection of the peak of R wave of the abdominal wall electric mother body, on the one hand, the method of wavelet decomposition and reconstruction of single channel signal is optimized. On the other hand, a fusion judgment method based on the R wave detection results of each channel is proposed. The paper is divided into 6 chapters, the first chapter is the introduction, the 2-5 chapters correspond to the above four tasks, the sixth chapter gives the summary of the work, and gives the prospects for the next work.
【學(xué)位授予單位】：南京大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：R714.5;TN911.7

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相關(guān)碩士學(xué)位論文 前1條

1 張潔敏;面向胎心電R波檢測的若干研究[D];南京大學(xué);2014年

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本文編號：1600772