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对采集的心音信号做归一化预处理,计算平均香农能量曲线,采用双阈值检测法、差分方法求出平均香农能量曲线的所有峰值点,利用前向差分法求出瞬时心率,这样可快速简便地计算出胎儿的瞬时心率,更好地服务于临床胎儿监护. 相似文献
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用传统的小波阈值法对超声多普勒胎儿心脏回波信号进行去噪处理时会产生Psuedo Gibbs现象,影响了去噪效果和胎儿心率值的提取。为了解决这个问题,在此基础上提出了平移不变小波法去噪。实验结果表明,该方法有效的抑制了Psuedo Gibbs现象,剔除了信号中的噪声,识别出被噪声淹没的有用信号,有利于心率值的提取。 相似文献
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胎儿心率是衡量胎儿健康状况的一项重要信息.利用胎心仪对胎儿心率进行监测是实现优生优育的一个重要手段.介绍了以AT89C51单片机为核心部件,以自相关算法处理数据为技术关键的超声多普勒胎心监测仪的实现方案.该方案由两片单片机分别担任取样和自相关计算的任务,很好地解决了低档单片机运行速度不够的问题,这也是所述方案的一个重要特点. 相似文献
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胎心率是临床上对胎儿进行监护的一个重要生理指标。在信号提取过程中,由于原始信号成分复杂,噪声干扰严重,胎儿心率的准确度受到很大的影响。为了能够准确地提取胎心率,本文提出一种改进的去噪算法。该算法是将小波阈值去噪与自适应谱线增强技术相融合。实验结果表明将两种方法融合后计算量减少,噪声有效降低,胎心率值计算更加准确。 相似文献
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随着信号处理技术和现代医疗技术的快速发展,保障胎儿和产妇安全是近年胎心监护研究的主要目标.在胎心监护中快速实时准确地检测瞬时胎心率具有较大的难度,提出了基于时频域独立分量分析的胎心音瞬时心率检测算法.通过对医院采集的多例不同孕期的胎儿心音信号做试验,验证了该算法的有效性和普遍适用性,该算法识别准确率高,计算速度快. 相似文献
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《微型机与应用》2017,(19):16-18
瞬时胎心率是监测胎儿健康状态的一种重要方式。当前,监控胎儿心率是重要而复杂的任务,正确的自动化分类和规则提取是非常必要的。医疗诊断自动化系统,不仅加强医疗保健,同时也可以降低成本。设计了一个有效挖掘规则,并根据给定的参数来预测胎儿的风险水平。采用C4.5、Classification and Regression Tree(CART)、随机森林分类器来进行系统比较。该系统的性能评价由分类精度、产生规则数量构成。实验结果表明,基于随机森林分类器的系统具有高精度(99.4%)的预测胎儿健康状态的潜力,同时,产生的规则数量精简且可供于医生决策。 相似文献
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In this paper, a non-invasive, portable and inexpensive antenatal care system is developed using fetal phonocardiography. The fPCG technique has the potential to provide low-cost and long-term diagnostics to the under-served population. The fPCG signal contains valuable diagnostic information regarding fetal health during antenatal period. The fPCG signals are acquired from the maternal abdominal surface using a wireless data acquisition and recording system. The diagnostic parameters e.g., baseline, variability, acceleration and deceleration of the fetal heart rate are derived from the fPCG signal. A model based on adaptive neuro-fuzzy inference system is developed for the evaluation of fetal health status. To study the performance of the developed system, experiments were carried out with real fPCG signals under the supervision of medical experts. Its performance is found to be in close proximity with the widely accepted Doppler ultrasound based fetal monitor results. The overall performance shows that the developed system has a long-term monitoring capability with very high performance to cost ratio. The system can be used as first screening tool by the medical practitioners. 相似文献
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便携式自动心率检测仪的设计 总被引:3,自引:0,他引:3
详细论述了便携式自动心率检测仪的设计原理及软、硬件设计要点。便携式自动心率检测仪是一种可随身携带,可记录、显示和存贮心率、可与微型计算机通讯并具有很强的抗干扰能力的新型的心率测定仪。该心率仪适用于体力劳动强度测定、脑力劳动强度测定以及其他的动态生理测定。 相似文献
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Software for advanced HRV analysis 总被引:9,自引:0,他引:9
Niskanen JP Tarvainen MP Ranta-Aho PO Karjalainen PA 《Computer methods and programs in biomedicine》2004,76(1):73-81
A computer program for advanced heart rate variability (HRV) analysis is presented. The program calculates all the commonly used time- and frequency-domain measures of HRV as well as the nonlinear Poincaré plot. In frequency-domain analysis parametric and nonparametric spectrum estimates are calculated. The program generates an informative printable report sheet which can be exported to various file formats including the portable document format (PDF). Results can also be saved as an ASCII file from which they can be imported to a spreadsheet program such as the Microsoft Excel. Together with a modern heart rate monitor capable of recording RR intervals this freely distributed program forms a complete low-cost HRV measuring and analysis system. 相似文献
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In this study, a new scheme was presented for the prediction of fetal state from fetal heart rate (FHR) and the uterine contraction (UC) signals obtained from cardiotocogram (CTG) recordings. CTG recordings are widely used in pregnancy and provide very valuable information regarding fetal well-being. The information effectively extracted from these recordings can be used to predict pathological state of the fetus and makes an early intervention possible before there is an irreversible damage to the fetus. The proposed scheme is based on adaptive neuro-fuzzy inference systems (ANFIS). Using features extracted from the FHR and UC signals, an ANFIS was trained to predict the normal and the pathological state. The method was tested with clinical data that consist of 1,831 CTG recordings. Out of these 1,831 recordings, 1,655 of them were classified as normal and the remaining 176 were classified as pathological by a consensus of three expert obstetricians. It was demonstrated that the ANFIS-based method was able to classify the normal and the pathologic states with 97.2 and 96.6 % accuracy, respectively. 相似文献
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针对健康与亚健康人群对远程心电动态监护的需求,提出了一种可用于远程健康监护的便携式无线心电监护终端.此监护终端采用TI公司的超低功耗16bit单片机作为系统核心,集成了模拟心电信号处理电路,外部Flash存储模块与蓝牙通讯模块.该监护终端可完成心电信号的采集与心率实时计算,可保存1小时的心电数据,并可实现经手机与远程监护中心的实时通讯,依据监护中心的控制选择性上传实时心电数据或心率数据.实验结果表明,该监护终端可实现连续24小时的动态心电监护. 相似文献