一种基于单通道腹部信号的胎儿心电提取算法
发布时间：2018-08-12 17:13
【摘要】：设计一种基于单通道孕腹部信号的胎儿心电提取算法,分别提取出母亲心电和胎儿心电,并计算出母亲心率和胎儿心率。首先对单通道孕腹部信号进行k-TEO(k=19)变换,突出母亲心电的QRS波,从而通过简单的阈值法确定母亲心电的R波位置,接着通过在相邻R波间重采样以获得相同的R-R间期T,这样经过一个间隔为T的梳状滤波器就可以分离出相同R-R间期的母亲心电,然后再一次在相邻R波间进行重采样恢复原来的R-R间期就可以获得实际的母亲心电了。原始腹部信号减去上面提取的母亲心电后,胎儿心电QRS波的信噪比大大提高,通过再次应用提取母亲心电的算法即可得到"干净"的胎儿心电波形。选取Physionet数据库中的8组(26通道)孕腹部信号数据进行分析,计算每个通道数据的胎儿心电QRS波位置识别灵敏度、阳性检测率和准确性。结果表明,胎儿心电QRS波的识别准确率达到87.1%,其中有6个通道达到100%。另外计算每个通道的母亲心率和胎儿心率并做统计分析,发现每一组中各个通道的母亲平均心率和胎儿平均心率都非常接近,同一组中各通道间母亲平均心率最大误差为0.1次/min,而胎儿平均心率最大误差也只有0.9次/min,进一步证明算法的可靠性。
[Abstract]:A fetal ECG extraction algorithm based on single channel gestational abdominal signals was designed to extract maternal ECG and fetal ECG respectively and calculate maternal heart rate and fetal heart rate. First, the single channel pregnant abdomen signal was transformed by k-TEO (KG19) to highlight the QRS wave of the mother's ECG, and then the position of the R wave of the maternal ECG was determined by a simple threshold method. Then by resampling between adjacent R waves to obtain the same R-R interval T, the mother ECG with the same R-R interval can be separated by a comb filter with an interval of T. Then re-sampling between adjacent R waves to restore the original R-R interval can obtain actual maternal ECG. After subtracting the maternal ECG from the original abdominal signal, the signal-to-noise ratio of fetal ECG QRS wave is greatly improved, and the "clean" fetal ECG waveform can be obtained by applying the algorithm of extracting maternal ECG signal again. Eight groups (26 channels) of pregnant abdominal signal data from Physionet database were selected to analyze the fetal ECG QRS wave position identification sensitivity, positive detection rate and accuracy of each channel data. The results showed that the recognition accuracy of fetal electrocardiogram (QRS) wave was 87.1, of which 6 channels reached 100kW. In addition, the maternal heart rate and the fetal heart rate of each channel were calculated and statistically analyzed. It was found that the average maternal heart rate and the fetal average heart rate of each channel in each group were very close. In the same group, the maximum error of the average heart rate of the mother is 0.1 times / min, while the maximum error of the fetal average heart rate is only 0.9 times / min, which further proves the reliability of the algorithm.
【作者单位】： 上海理工大学医疗器械与食品学院;
【分类号】：R714.5;TN911.7
本文编号：2179732
[Abstract]:A fetal ECG extraction algorithm based on single channel gestational abdominal signals was designed to extract maternal ECG and fetal ECG respectively and calculate maternal heart rate and fetal heart rate. First, the single channel pregnant abdomen signal was transformed by k-TEO (KG19) to highlight the QRS wave of the mother's ECG, and then the position of the R wave of the maternal ECG was determined by a simple threshold method. Then by resampling between adjacent R waves to obtain the same R-R interval T, the mother ECG with the same R-R interval can be separated by a comb filter with an interval of T. Then re-sampling between adjacent R waves to restore the original R-R interval can obtain actual maternal ECG. After subtracting the maternal ECG from the original abdominal signal, the signal-to-noise ratio of fetal ECG QRS wave is greatly improved, and the "clean" fetal ECG waveform can be obtained by applying the algorithm of extracting maternal ECG signal again. Eight groups (26 channels) of pregnant abdominal signal data from Physionet database were selected to analyze the fetal ECG QRS wave position identification sensitivity, positive detection rate and accuracy of each channel data. The results showed that the recognition accuracy of fetal electrocardiogram (QRS) wave was 87.1, of which 6 channels reached 100kW. In addition, the maternal heart rate and the fetal heart rate of each channel were calculated and statistically analyzed. It was found that the average maternal heart rate and the fetal average heart rate of each channel in each group were very close. In the same group, the maximum error of the average heart rate of the mother is 0.1 times / min, while the maximum error of the fetal average heart rate is only 0.9 times / min, which further proves the reliability of the algorithm.
【作者单位】： 上海理工大学医疗器械与食品学院;
【分类号】：R714.5;TN911.7
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