The Experts below are selected from a list of 747 Experts worldwide ranked by ideXlab platform
Ferenc Kovács - One of the best experts on this subject based on the ideXlab platform.
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screening for congenital heart diseases by murmurs using telemedical Phonocardiography
International Conference of the IEEE Engineering in Medicine and Biology Society, 2012Co-Authors: Gabor Fodor, Gabor Hosszu, Adam T. Balogh, Ferenc KovácsAbstract:A large proportion of congenital heart diseases (CHD) remain undetected during pregnancy or even after birth. Many of them generate turbulent blood flow, resulting heart murmur. Doppler ultrasound cardiotocography (CTG) is suitable for the assessment of the fetal heart rate and some derived parameters, but it is inadequate for detecting heart murmurs. Although comprehensive examination can be carried out with echocardiography, it is expensive and requires expertise; therefore, it is not applicable for widespread screening. This paper presents a new possibility for screening for some CHDs using Phonocardiography, which can be combined with Doppler ultrasound CTG as an extension of it. Furthermore it can be carried out at home allowing repeated measurements, which increases also the reliability of filtering out innocent murmurs. The diagnostic capability of this screening method is supported by a large number of evaluated fetal heart sound records. Moreover, according to experiences pregnant women prefer this reliable, easy to use method, which facilitates their examination.
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fetal Phonocardiography past and future possibilities
Computer Methods and Programs in Biomedicine, 2011Co-Authors: Ferenc Kovács, Csaba Horváth, Adam T. Balogh, Gabor HosszuAbstract:The paper presents an overview of the 15 year long development of fetal Phonocardiography including the works on the applied signal processing methods for identification of sound components. Based on the improvements achieved on this field, the paper shows that beyond the traditional CTG test the Phonocardiography may be successfully applied for long-term fetal measurements and home monitoring. In addition, by indication of heart murmurs based on a comprehensive analysis of the recorded heart sound congenital heart defects can also be detected together with additional features in the third trimester. This makes an early widespread screening possible combined with the prescribed CTG test even at home using a telemedicine system.
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application of Phonocardiography on preterm infants with patent ductus arteriosus
Biomedical Signal Processing and Control, 2011Co-Authors: Adam T. Balogh, Ferenc KovácsAbstract:The patent ductus arteriosus (PDA) is a prevalent disease in case of preterm newborns. The assessment of some parameters of the PDA with simple and noninvasive measurement equipment, such as Phonocardiography (PCG), could be of great significance. In this paper two features of the heart sound have been investigated. The first one is the sensitive identification of murmur related to PDA. This was achieved by calculating the average maximal late systolic envelope value (LSEVmax), which was significantly greater in case of preterms with PDA (p < 0.05). The second feature was the investigation of the splitting interval (SI) of the second heart sound (S2). For this a S2 sound model valid for preterms was developed. By estimating the SI using a heuristic method it was found, that the estimated splitting time increased by 30% around the time of the closure of the PDA in case of pharmacologically treated preterm newborns. In case of both analysis a characteristic heart sound calculation method was applied for improved reliability of the extracted features.
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parameter extraction for diagnosing patent ductus arteriosus in preterm neonates using Phonocardiography
Applied Sciences on Biomedical and Communication Technologies, 2010Co-Authors: Adam T. Balogh, Ferenc KovácsAbstract:In this paper a method is described for parameter extraction from murmur related to patent ductus arterio-sus (PDA) in case of preterm infants using Phonocardiography. The relationship between the extracted time and frequency domain parameters and the medical parameters of the patent ductus arteriosus has been investigated. This analysis revealed that the frequency parameters of the murmur could be related to the diameter of the PDA and to the maximal blood flow velocity through the PDA. Nevertheless the results are promising, further work is needed for more reliable parameter estimation for robust verification of the mentioned relationships.
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A New, Phonocardiography-Based Telemetric Fetal Home Monitoring System
Telemedicine journal and e-health : the official journal of the American Telemedicine Association, 2010Co-Authors: Ferenc Kovács, Miklós Török, Csaba Horváth, Adam T. Balogh, Tamas Zsedrovits, Andrea Nagy, Gabor HosszuAbstract:The purpose of this article is to describe a new, Phonocardiography-based fetal telemonitoring system, which, due to its passive nature, allows long-term measurements even at the home of the pregnant woman. The input element of the system was the home monitor with two sensors for recording the trans-abdominal fetal heart signal and the uterine contractions. The recorded signal was transmitted by mobile network and Internet to an Evaluation Center, where it was analyzed in detail to obtain information about possible dysfunction of the fetal heart. The investigations on this system made clear that by advanced processing of the recorded signal the system captured many additional cardiac features compared with the traditional ultrasound-based cardiotocographic procedure.
Adam T. Balogh - One of the best experts on this subject based on the ideXlab platform.
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screening for congenital heart diseases by murmurs using telemedical Phonocardiography
International Conference of the IEEE Engineering in Medicine and Biology Society, 2012Co-Authors: Gabor Fodor, Gabor Hosszu, Adam T. Balogh, Ferenc KovácsAbstract:A large proportion of congenital heart diseases (CHD) remain undetected during pregnancy or even after birth. Many of them generate turbulent blood flow, resulting heart murmur. Doppler ultrasound cardiotocography (CTG) is suitable for the assessment of the fetal heart rate and some derived parameters, but it is inadequate for detecting heart murmurs. Although comprehensive examination can be carried out with echocardiography, it is expensive and requires expertise; therefore, it is not applicable for widespread screening. This paper presents a new possibility for screening for some CHDs using Phonocardiography, which can be combined with Doppler ultrasound CTG as an extension of it. Furthermore it can be carried out at home allowing repeated measurements, which increases also the reliability of filtering out innocent murmurs. The diagnostic capability of this screening method is supported by a large number of evaluated fetal heart sound records. Moreover, according to experiences pregnant women prefer this reliable, easy to use method, which facilitates their examination.
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fetal Phonocardiography past and future possibilities
Computer Methods and Programs in Biomedicine, 2011Co-Authors: Ferenc Kovács, Csaba Horváth, Adam T. Balogh, Gabor HosszuAbstract:The paper presents an overview of the 15 year long development of fetal Phonocardiography including the works on the applied signal processing methods for identification of sound components. Based on the improvements achieved on this field, the paper shows that beyond the traditional CTG test the Phonocardiography may be successfully applied for long-term fetal measurements and home monitoring. In addition, by indication of heart murmurs based on a comprehensive analysis of the recorded heart sound congenital heart defects can also be detected together with additional features in the third trimester. This makes an early widespread screening possible combined with the prescribed CTG test even at home using a telemedicine system.
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application of Phonocardiography on preterm infants with patent ductus arteriosus
Biomedical Signal Processing and Control, 2011Co-Authors: Adam T. Balogh, Ferenc KovácsAbstract:The patent ductus arteriosus (PDA) is a prevalent disease in case of preterm newborns. The assessment of some parameters of the PDA with simple and noninvasive measurement equipment, such as Phonocardiography (PCG), could be of great significance. In this paper two features of the heart sound have been investigated. The first one is the sensitive identification of murmur related to PDA. This was achieved by calculating the average maximal late systolic envelope value (LSEVmax), which was significantly greater in case of preterms with PDA (p < 0.05). The second feature was the investigation of the splitting interval (SI) of the second heart sound (S2). For this a S2 sound model valid for preterms was developed. By estimating the SI using a heuristic method it was found, that the estimated splitting time increased by 30% around the time of the closure of the PDA in case of pharmacologically treated preterm newborns. In case of both analysis a characteristic heart sound calculation method was applied for improved reliability of the extracted features.
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parameter extraction for diagnosing patent ductus arteriosus in preterm neonates using Phonocardiography
Applied Sciences on Biomedical and Communication Technologies, 2010Co-Authors: Adam T. Balogh, Ferenc KovácsAbstract:In this paper a method is described for parameter extraction from murmur related to patent ductus arterio-sus (PDA) in case of preterm infants using Phonocardiography. The relationship between the extracted time and frequency domain parameters and the medical parameters of the patent ductus arteriosus has been investigated. This analysis revealed that the frequency parameters of the murmur could be related to the diameter of the PDA and to the maximal blood flow velocity through the PDA. Nevertheless the results are promising, further work is needed for more reliable parameter estimation for robust verification of the mentioned relationships.
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A New, Phonocardiography-Based Telemetric Fetal Home Monitoring System
Telemedicine journal and e-health : the official journal of the American Telemedicine Association, 2010Co-Authors: Ferenc Kovács, Miklós Török, Csaba Horváth, Adam T. Balogh, Tamas Zsedrovits, Andrea Nagy, Gabor HosszuAbstract:The purpose of this article is to describe a new, Phonocardiography-based fetal telemonitoring system, which, due to its passive nature, allows long-term measurements even at the home of the pregnant woman. The input element of the system was the home monitor with two sensors for recording the trans-abdominal fetal heart signal and the uterine contractions. The recorded signal was transmitted by mobile network and Internet to an Evaluation Center, where it was analyzed in detail to obtain information about possible dysfunction of the fetal heart. The investigations on this system made clear that by advanced processing of the recorded signal the system captured many additional cardiac features compared with the traditional ultrasound-based cardiotocographic procedure.
M. Pena - One of the best experts on this subject based on the ideXlab platform.
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On-line fetal heart rate monitor by Phonocardiography
Proceedings of the 25th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (IEEE Cat. No.03CH37439), 2003Co-Authors: M. Godinez, A. Jimenez, R. Ortiz, M. PenaAbstract:The beat-to-beat fetal heart rate variability can be evaluated using the fetal phonocardiogram (fPCG) as a part of a well-being evaluation procedure. In previous works, we have developed and tested an off-line algorithm to generate cardiotachograms (CTGs) by processing fPCGs. This method has showed its confidence to generate reliable CTGs, especially when maximums of cardiac sounds (S1 and S2) are used. Now we are interested to change our off-line processing scheme into a first on-line fetal heart rate monitor version. This monitor was developed with a LabView-Matlab program, it acquires and processes the fPCGs displaying, almost on-line, the CTGs generated by S1 and S2. It also storages information and provides the possibility to manually correct CTGs. For testing the monitor, off-line time references from five testing signals were calculated, and compared against monitor time references. This comparison showed good results on detecting on-line time references and intervals. The system really works as a monitor, it acquires and processes signals during 20 minutes at least, and its CTGs do not differ from the off-line CTGs for more than 2 ms. The system is now ready to include an adaptive filter that improves its performance with fPCGs.
Gabor Hosszu - One of the best experts on this subject based on the ideXlab platform.
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a proposed novel method for chd screening by fetal heart murmur detection using Phonocardiography
Studies in health technology and informatics, 2013Co-Authors: F. Kovács, Gabor Fodor, Gabor HosszuAbstract:The paper presents a novel screening method to indicate congenital heart diseases (CHD) which otherwise would remain undetected because of their low level. Therefore, not belonging to the high-risk population, they are omitted from the regular fetal monitoring with ultrasound echocardiography. Based on the fact that CHDs are morphological defects of the heart causing turbulent blood flow, this turbulence appears as a murmur, which can be detected by Phonocardiography (PCG). The proposed method applies measurements on the maternal abdomen and from the recorded sound signal a sophisticated processing determines the fetal heart murmur. The paper describes the problems and the additional advantages of the PCG method including the possibility of measurements at home and its combination with the prescribed regular cardiotocographic (CTG) monitoring. The proposed screening process implemented on a telemedicine system provides an enhanced safety against hidden cardiac diseases.
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screening for congenital heart diseases by murmurs using telemedical Phonocardiography
International Conference of the IEEE Engineering in Medicine and Biology Society, 2012Co-Authors: Gabor Fodor, Gabor Hosszu, Adam T. Balogh, Ferenc KovácsAbstract:A large proportion of congenital heart diseases (CHD) remain undetected during pregnancy or even after birth. Many of them generate turbulent blood flow, resulting heart murmur. Doppler ultrasound cardiotocography (CTG) is suitable for the assessment of the fetal heart rate and some derived parameters, but it is inadequate for detecting heart murmurs. Although comprehensive examination can be carried out with echocardiography, it is expensive and requires expertise; therefore, it is not applicable for widespread screening. This paper presents a new possibility for screening for some CHDs using Phonocardiography, which can be combined with Doppler ultrasound CTG as an extension of it. Furthermore it can be carried out at home allowing repeated measurements, which increases also the reliability of filtering out innocent murmurs. The diagnostic capability of this screening method is supported by a large number of evaluated fetal heart sound records. Moreover, according to experiences pregnant women prefer this reliable, easy to use method, which facilitates their examination.
-
fetal Phonocardiography past and future possibilities
Computer Methods and Programs in Biomedicine, 2011Co-Authors: Ferenc Kovács, Csaba Horváth, Adam T. Balogh, Gabor HosszuAbstract:The paper presents an overview of the 15 year long development of fetal Phonocardiography including the works on the applied signal processing methods for identification of sound components. Based on the improvements achieved on this field, the paper shows that beyond the traditional CTG test the Phonocardiography may be successfully applied for long-term fetal measurements and home monitoring. In addition, by indication of heart murmurs based on a comprehensive analysis of the recorded heart sound congenital heart defects can also be detected together with additional features in the third trimester. This makes an early widespread screening possible combined with the prescribed CTG test even at home using a telemedicine system.
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A New, Phonocardiography-Based Telemetric Fetal Home Monitoring System
Telemedicine journal and e-health : the official journal of the American Telemedicine Association, 2010Co-Authors: Ferenc Kovács, Miklós Török, Csaba Horváth, Adam T. Balogh, Tamas Zsedrovits, Andrea Nagy, Gabor HosszuAbstract:The purpose of this article is to describe a new, Phonocardiography-based fetal telemonitoring system, which, due to its passive nature, allows long-term measurements even at the home of the pregnant woman. The input element of the system was the home monitor with two sensors for recording the trans-abdominal fetal heart signal and the uterine contractions. The recorded signal was transmitted by mobile network and Internet to an Evaluation Center, where it was analyzed in detail to obtain information about possible dysfunction of the fetal heart. The investigations on this system made clear that by advanced processing of the recorded signal the system captured many additional cardiac features compared with the traditional ultrasound-based cardiotocographic procedure.
Homer Nazeran - One of the best experts on this subject based on the ideXlab platform.
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wavelet based segmentation and feature extraction of heart sounds for intelligent pda based Phonocardiography
Methods of Information in Medicine, 2007Co-Authors: Homer NazeranAbstract:Objectives: Many pathological conditions of the cardiovascular system cause murmurs and aberrations in heart sounds. Phonocardiography provides the clinician with a complementary tool to record the heart sounds heard during auscultation. The advancement of intracardiac Phonocardiography combined with modern digital signal processing techniques has strongly renewed researchers’ interest in studying heart sounds and murmurs. The aim of this work is to investigate the applicability of different spectral analysis methods to heart sound signals and explore their suitability for PDA-based implementation. Methods: Fourier transform (FT), short-time Fourier transform (STFT) and wavelet transform (WT) are used to perform spectral analysis on heart sounds. A segmentation algorithm based on Shannon energy is used to differentiate between first and second heart sounds. Then wavelet transform is deployed again to extract 64 features of heart sounds. Results: The FT provides valuable frequency information but the timing information is lost during the transformation process. The STFT or spectrogram provides valuable time-frequency information but there is a trade-off between time and frequency resolution. Wavelet analysis, however, does not suffer from limitations of the STFT and provides adequate time and frequency resolution to accurately characterize the normal and pathological heart sounds. Conclusions: The results show that the wavelet-based segmentation algorithm is quite effective in localizing the important components of both normal and abnormal heart sounds. They also demonstrate that wavelet-based feature extraction provides suitable feature vectors which are clearly differentiable and useful for automatic classification of heart sounds.
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digital Phonocardiography a pda based approach
International Conference of the IEEE Engineering in Medicine and Biology Society, 2004Co-Authors: M Brusco, Homer NazeranAbstract:In this paper we demonstrate the applicability of advanced digital signal processing algorithms to the analysis of heart sound signals and describe the development of a PDA-based biomedical instrument capable of acquisition, processing, and analysis of heart sounds. Fourier transform-based spectral analysis of heart sounds was carried out first to show the differences in the frequency contents of normal and abnormal heart sounds. As the time-varying nature of heart sounds calls for better techniques capable of analyzing such signals: the short time Fourier transform (STFT) or spectrogram analysis was performed next. This method performed remarkably well in displaying frequency, magnitude, and time information of the heart sounds, providing robust parameters to make accurate diagnosis. With continuous technological advancements in computing and biomedical instrumentation, and the concurrent popularity of handheld instruments in the medical community, we introduce the concept of PDA-based digital Phonocardiography. A prototype system is comprised of a digital stethoscope and a pocket PC. Heart sounds are recorded and displayed in the pocket PC screen. Advanced signal processing algorithms are implemented using the combined capabilities of software tools such as LabVlEW and embedded Visual C/sup ++/.