Pub Date : 1998-02-15DOI: 10.1109/ICBEM.1998.666372
Z. Xu, E. Butler, M. Horne
A neural-fuzzy network was applied to detect changes in neuronal discharge patterns. The network was firstly trained by a set of input-output data to simulate the classification processing of neuronal discharge patterns assessed by experienced researchers. A second set of data was then used to test the network. Both train and test data were recorded from the cerebellar thalamus of a conscious monkey performing voluntary wrist movements. The preliminary result illustrates that the neural-fuzzy network has potential advantages in classification of neuronal discharge patterns.
{"title":"A study of a neural-fuzzy network method for recognising change in neuronal discharge patterns","authors":"Z. Xu, E. Butler, M. Horne","doi":"10.1109/ICBEM.1998.666372","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666372","url":null,"abstract":"A neural-fuzzy network was applied to detect changes in neuronal discharge patterns. The network was firstly trained by a set of input-output data to simulate the classification processing of neuronal discharge patterns assessed by experienced researchers. A second set of data was then used to test the network. Both train and test data were recorded from the cerebellar thalamus of a conscious monkey performing voluntary wrist movements. The preliminary result illustrates that the neural-fuzzy network has potential advantages in classification of neuronal discharge patterns.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116367100","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-02-15DOI: 10.1109/ICBEM.1998.666429
A. Kandori, K. Tsukada, H. Horigome, M. Asaka, S. Shigemitsu, M. Takahashi, Y. Terada, T. Kubo, Akira Matsui, T. Mitsui
A nine-channel SQUID magnetometer system is developed to detect weak magnetic fields generated by fetal cardiac activity. The nine 20-mm-diameter axial first-order gradiometers are mounted at intervals of 30 mm. A baseline length of 60 mm is applied to the pickup coil to measure the weak magnetic field from a fetal heart in a deep position. The SQUID is operated with a flux-locked loop (FLL) circuit and the FLL output is recorded at 1 kHz by a computer. Fetal magneto-cardiograms (FMCG) were measured for 109 fetuses of 20 to 39 weeks' gestation. In most cases, maternal MCG interference was negligible. R-wave peaks were detected in 81% of all subjects. The results of FMCG measurements and Fourier analysis of fetal the R-R interval are shown in this paper.
{"title":"Multichannel SQUID system for detecting fetal magnetocardiograms","authors":"A. Kandori, K. Tsukada, H. Horigome, M. Asaka, S. Shigemitsu, M. Takahashi, Y. Terada, T. Kubo, Akira Matsui, T. Mitsui","doi":"10.1109/ICBEM.1998.666429","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666429","url":null,"abstract":"A nine-channel SQUID magnetometer system is developed to detect weak magnetic fields generated by fetal cardiac activity. The nine 20-mm-diameter axial first-order gradiometers are mounted at intervals of 30 mm. A baseline length of 60 mm is applied to the pickup coil to measure the weak magnetic field from a fetal heart in a deep position. The SQUID is operated with a flux-locked loop (FLL) circuit and the FLL output is recorded at 1 kHz by a computer. Fetal magneto-cardiograms (FMCG) were measured for 109 fetuses of 20 to 39 weeks' gestation. In most cases, maternal MCG interference was negligible. R-wave peaks were detected in 81% of all subjects. The results of FMCG measurements and Fourier analysis of fetal the R-R interval are shown in this paper.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122870866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-02-15DOI: 10.1109/ICBEM.1998.666430
O. Okazaki, D. Wei, K. Harumi
This study is a three-dimensional (3-D) simulation aimed at verification about the M cell function during Torsade de Pointes (TdP). The entire process of TdP initiation, propagation and termination were successfully reproduced and the M cell function was examined. The heart model used in this simulation was previously described in detail (D. Wei et al., IEEE, vol. 42, p. 343-57, 1995). The model consists of approximately 50,000 functional cubic units with spatial resolution of 1.5 mm in dameter. Findings in the authors' study agree to those of C. Antzelevitch et al. (1996). By setting M cells in the heart model, the authors' study successfully simulated the TdP process and suggests that the reentry around M cells might be a possible mechanism in the formation of TdP.
本研究是一个三维(3-D)模拟，旨在验证M细胞在扭转角(TdP)期间的功能。成功复制了TdP起始、增殖和终止的整个过程，并检测了M细胞的功能。在此模拟中使用的心脏模型先前有详细描述(D. Wei et al.， IEEE, vol. 42, p. 343-57, 1995)。该模型由大约50,000个功能立方单元组成，空间分辨率为1.5 mm。作者的研究结果与C. Antzelevitch等人(1996)的研究结果一致。通过在心脏模型中设置M细胞，作者的研究成功地模拟了TdP过程，并提示M细胞周围的再进入可能是TdP形成的一种可能机制。
{"title":"Three dimensional excitation sequence during Torsade de Points in the cardiac computer model with M cells","authors":"O. Okazaki, D. Wei, K. Harumi","doi":"10.1109/ICBEM.1998.666430","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666430","url":null,"abstract":"This study is a three-dimensional (3-D) simulation aimed at verification about the M cell function during Torsade de Pointes (TdP). The entire process of TdP initiation, propagation and termination were successfully reproduced and the M cell function was examined. The heart model used in this simulation was previously described in detail (D. Wei et al., IEEE, vol. 42, p. 343-57, 1995). The model consists of approximately 50,000 functional cubic units with spatial resolution of 1.5 mm in dameter. Findings in the authors' study agree to those of C. Antzelevitch et al. (1996). By setting M cells in the heart model, the authors' study successfully simulated the TdP process and suggests that the reentry around M cells might be a possible mechanism in the formation of TdP.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"8 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120857033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-02-15DOI: 10.1109/ICBEM.1998.666401
S. Ollmar, I. Nicander
Depending on the frequency range, electrical bio-impedance (EBI) spectra of skin reflect the hydration of the stratum corneum, experimental irritative and allergic reactions, skin barrier properties, and alterations due to some diseases. For oral mucosa, the degree of keratinization is an important factor. Baseline values differ while reactions are reflected in a manner similar to skin. Patterns of indices can discriminate between different types of irritative reactions, possibly discriminate irritative reactions from allergic ones as well as differentiating some diseases. The sensitivity is high, and quantification of alterations below the visual threshold are possible non-invasively.
{"title":"Diagnostic potential of electrical bio-impedance for skin and oral mucosa","authors":"S. Ollmar, I. Nicander","doi":"10.1109/ICBEM.1998.666401","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666401","url":null,"abstract":"Depending on the frequency range, electrical bio-impedance (EBI) spectra of skin reflect the hydration of the stratum corneum, experimental irritative and allergic reactions, skin barrier properties, and alterations due to some diseases. For oral mucosa, the degree of keratinization is an important factor. Baseline values differ while reactions are reflected in a manner similar to skin. Patterns of indices can discriminate between different types of irritative reactions, possibly discriminate irritative reactions from allergic ones as well as differentiating some diseases. The sensitivity is high, and quantification of alterations below the visual threshold are possible non-invasively.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125924741","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-02-15DOI: 10.1109/ICBEM.1998.666365
J. Malmivuo
The discipline of bioelectromagnetism is 6000 years old. Bioelectric methods have developed to very important diagnostic and therapeutic methods in the modern medicine. Large investments are made to develop also the biomagnetic applications for medical use. Their future is, however, still unclear.
{"title":"History, present status and future of bioelectromagnetism","authors":"J. Malmivuo","doi":"10.1109/ICBEM.1998.666365","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666365","url":null,"abstract":"The discipline of bioelectromagnetism is 6000 years old. Bioelectric methods have developed to very important diagnostic and therapeutic methods in the modern medicine. Large investments are made to develop also the biomagnetic applications for medical use. Their future is, however, still unclear.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126903415","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-02-15DOI: 10.1109/ICBEM.1998.666386
D. Stroud
Measurements of bioimpedance are often used to determine water spaces in humans and this leads to the perception that it measures the sum of extra- plus intracellular water at high frequencies. Using a simple mathematical model it is shown that the intra-cellular water makes only a small contribution to the quantity that it actually measures.
{"title":"What does bioimpedance measure?","authors":"D. Stroud","doi":"10.1109/ICBEM.1998.666386","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666386","url":null,"abstract":"Measurements of bioimpedance are often used to determine water spaces in humans and this leads to the perception that it measures the sum of extra- plus intracellular water at high frequencies. Using a simple mathematical model it is shown that the intra-cellular water makes only a small contribution to the quantity that it actually measures.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130399210","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-02-15DOI: 10.1109/ICBEM.1998.666444
T. Dovan, R. Owen
The interference by ambient 50 Hz magnetic fields on computer monitors or VDUs is an issue which has become prominent in recent times due to the widespread use of personal computers. Various options exist to resolve the interference problem by dealing either with the VDU or with the magnetic field sources including the selection of suitable locations or types of monitor, shielding or modification of equipment. For new installations, appropriate design and installation practices adopted at the outset can reduce or eliminate subsequent costly modifications.
{"title":"Power frequency magnetic fields and computer VDU interference phenomena","authors":"T. Dovan, R. Owen","doi":"10.1109/ICBEM.1998.666444","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666444","url":null,"abstract":"The interference by ambient 50 Hz magnetic fields on computer monitors or VDUs is an issue which has become prominent in recent times due to the widespread use of personal computers. Various options exist to resolve the interference problem by dealing either with the VDU or with the magnetic field sources including the selection of suitable locations or types of monitor, shielding or modification of equipment. For new installations, appropriate design and installation practices adopted at the outset can reduce or eliminate subsequent costly modifications.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128408923","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-02-15DOI: 10.1109/ICBEM.1998.666440
H. Gholamhosseini, H. Nazeran, K. Reynolds
A digital filter structure is proposed to maximally remove noise from the ECG signals. This structure is based on cascading a zero-phase bandpass, an adaptive filter, and multi-band-pass filter. It provides an efficient method for removing noise from the ECG signals. This filter structure has low implementation complexity and introduces little noise into a typical ECG. It can be applied to real-time applications particularly automatic cardiac arrhythmia classifiers.
{"title":"ECG noise cancellation using digital filters","authors":"H. Gholamhosseini, H. Nazeran, K. Reynolds","doi":"10.1109/ICBEM.1998.666440","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666440","url":null,"abstract":"A digital filter structure is proposed to maximally remove noise from the ECG signals. This structure is based on cascading a zero-phase bandpass, an adaptive filter, and multi-band-pass filter. It provides an efficient method for removing noise from the ECG signals. This filter structure has low implementation complexity and introduces little noise into a typical ECG. It can be applied to real-time applications particularly automatic cardiac arrhythmia classifiers.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"2018 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122889639","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-02-15DOI: 10.1109/ICBEM.1998.666433
F. Kocijan
Our planet is enveloped by an electric field, which is always present, but varies in magnitude. Even though this has been known for several decades, very little attention is being given to this phenomenon. This global electric field is still not fully understood and provides more questions than answers. Local factors like topology, vegetation and atmospheric parameters shape this field at the surface to such an extent, that virtually no two places have identical local geoelectric fields. This paper discusses some aspects of this field and presents data obtained and studied over several years by the author.
{"title":"The natural geoelectric field","authors":"F. Kocijan","doi":"10.1109/ICBEM.1998.666433","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666433","url":null,"abstract":"Our planet is enveloped by an electric field, which is always present, but varies in magnitude. Even though this has been known for several decades, very little attention is being given to this phenomenon. This global electric field is still not fully understood and provides more questions than answers. Local factors like topology, vegetation and atmospheric parameters shape this field at the surface to such an extent, that virtually no two places have identical local geoelectric fields. This paper discusses some aspects of this field and presents data obtained and studied over several years by the author.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127326434","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 1998-02-15DOI: 10.1109/ICBEM.1998.666367
G. Lafer, P. Wach, B. Tilg
A method for parametric description of boundary surfaces based on combined second order surface and double Fourier series approximation is presented. Gauss transformation is used to determine the best fitting parameters. The method is applied to approximate the conductivity interfaces of volume conductor models needed for solving the bioelectromagnetic forward and inverse problem. The attained quality of fit was compared to that obtained applying the surface harmonic expansion for modeling the volume conductor shape. In that case, the coefficients of expansion are found by nonlinear least-squares fit.
{"title":"Modeling the volume conductor-double Fourier series approximation versus spherical harmonic expansion","authors":"G. Lafer, P. Wach, B. Tilg","doi":"10.1109/ICBEM.1998.666367","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666367","url":null,"abstract":"A method for parametric description of boundary surfaces based on combined second order surface and double Fourier series approximation is presented. Gauss transformation is used to determine the best fitting parameters. The method is applied to approximate the conductivity interfaces of volume conductor models needed for solving the bioelectromagnetic forward and inverse problem. The attained quality of fit was compared to that obtained applying the surface harmonic expansion for modeling the volume conductor shape. In that case, the coefficients of expansion are found by nonlinear least-squares fit.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"121 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1998-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117306725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：