Pub Date : 1998-02-15DOI: 10.1109/ICBEM.1998.666423
B. Lithgow
Inferior colliculus (IC) units have a significantly lower stimulus threshold when driven with a cochlear implant using bipolar stimuli at high (2 k pulses/s) compared to low (125 pulse/s) pulse rates. At high pulse rates temporal summation is used to explain this threshold shift.
{"title":"Cochlear implant threshold changes at high electric stimulus pulse rates","authors":"B. Lithgow","doi":"10.1109/ICBEM.1998.666423","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666423","url":null,"abstract":"Inferior colliculus (IC) units have a significantly lower stimulus threshold when driven with a cochlear implant using bipolar stimuli at high (2 k pulses/s) compared to low (125 pulse/s) pulse rates. At high pulse rates temporal summation is used to explain this threshold shift.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"83 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":"115396805","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.1998.666369
U. Wiklund, M. Akay
In this study we use the adapted wavelet transform methods (wavelet and cosine packets) for spectral analysis of bioelectric signals. These methods have recently been introduced for analysis of non-stationary signals. Using recordings of the heart rate variability in twenty healthy subjects, the estimated power in different frequency bands is compared to results based on the classical methods: fast Fourier transform and autoregressive modelling. The results showed that cosine packets gave similar results to classical methods, and may be preferred to characterise the rhythmic components in the recorded signals. On the other hand, the non-stationary fluctuations, i.e., the "trend", was efficiently decomposed using the wavelet transform method.
{"title":"Spectral analysis of bioelectric signals by adapted wavelet transforms","authors":"U. Wiklund, M. Akay","doi":"10.1109/ICBEM.1998.666369","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666369","url":null,"abstract":"In this study we use the adapted wavelet transform methods (wavelet and cosine packets) for spectral analysis of bioelectric signals. These methods have recently been introduced for analysis of non-stationary signals. Using recordings of the heart rate variability in twenty healthy subjects, the estimated power in different frequency bands is compared to results based on the classical methods: fast Fourier transform and autoregressive modelling. The results showed that cosine packets gave similar results to classical methods, and may be preferred to characterise the rhythmic components in the recorded signals. On the other hand, the non-stationary fluctuations, i.e., the \"trend\", was efficiently decomposed using the wavelet transform method.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"48 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":"125500198","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.1998.666455
I. Rauchberger, M. Cohen, A. Dart
Pulse pressure waves (PPWs) were recorded from the radial artery using photoplethysmography in 7 healthy subjects (6M, 1F, mean age 23 yrs) at rest every 3 hours between 9 am and 6 pm. Analysis of variations of PPWs included sum of square differences between waves, ANOVA and spectral analysis of the components of waves. PPWs recorded at 9am were not significantly different to PPWs recorded at 6 pm, however, PPWs between each other time period were significantly different, with the largest difference occurring between 9 am and 3pm. There was also some variation in the frequency components of the PPWs with an increase in higher frequency components as the day progresses. The finding of this study supports the suggestion within TCM that there are changes in PPW throughout the day.
{"title":"Analysis of the diurnal variation of arterial pressure waves","authors":"I. Rauchberger, M. Cohen, A. Dart","doi":"10.1109/ICBEM.1998.666455","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666455","url":null,"abstract":"Pulse pressure waves (PPWs) were recorded from the radial artery using photoplethysmography in 7 healthy subjects (6M, 1F, mean age 23 yrs) at rest every 3 hours between 9 am and 6 pm. Analysis of variations of PPWs included sum of square differences between waves, ANOVA and spectral analysis of the components of waves. PPWs recorded at 9am were not significantly different to PPWs recorded at 6 pm, however, PPWs between each other time period were significantly different, with the largest difference occurring between 9 am and 3pm. There was also some variation in the frequency components of the PPWs with an increase in higher frequency components as the day progresses. The finding of this study supports the suggestion within TCM that there are changes in PPW throughout the day.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"29 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":"124077344","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}
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.1998.666443
I. Rauchberger, A. Dart, M. Cohen
Radial pressure waves (RPWs) and carotid pressure waves (CPWs) were recorded using applanation tonometry in 6 healthy subjects (5M, 1F, all aged 21 yrs) at rest as well as after a vasodilator agent (sublingual glyceryl trinitrate [GTN] spray). For each subject, transfer functions between radial and carotid pressure waves were calculated by a nonparametric Fourier method. Using the transfer functions, CPWs were reconstructed from RPWs and compared to tonometrically recorded CPWs. The transfer functions accurately predicted CPWs at rest, however, post-GTN, there were significant differences between reconstructed and recorded CPWs. The timing of peak systolic pressure, as predicted by the reconstructed CPWs, was underestimated by 0.3% at rest and was overestimated by 2.3% post-GTN spray.
{"title":"Prediction of carotid pressure waveforms by mathematical transformation of pressure waves recorded from the radial artery","authors":"I. Rauchberger, A. Dart, M. Cohen","doi":"10.1109/ICBEM.1998.666443","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666443","url":null,"abstract":"Radial pressure waves (RPWs) and carotid pressure waves (CPWs) were recorded using applanation tonometry in 6 healthy subjects (5M, 1F, all aged 21 yrs) at rest as well as after a vasodilator agent (sublingual glyceryl trinitrate [GTN] spray). For each subject, transfer functions between radial and carotid pressure waves were calculated by a nonparametric Fourier method. Using the transfer functions, CPWs were reconstructed from RPWs and compared to tonometrically recorded CPWs. The transfer functions accurately predicted CPWs at rest, however, post-GTN, there were significant differences between reconstructed and recorded CPWs. The timing of peak systolic pressure, as predicted by the reconstructed CPWs, was underestimated by 0.3% at rest and was overestimated by 2.3% post-GTN spray.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"19 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":"115141499","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.1998.666378
J. Kaik, J. Lass, K. Maigas
The correlation between the parameters reflecting ventricular repolarization inhomogeneity and the results of programmed ventricular stimulation was assessed in 58 post-myocardial infarction patients. Registration of increased QTc interval duration and QT and QTa interval dispersion in patients with high risk of sudden death as compared to the patients without it according to the results of programmed ventricular stimulation (469.5/spl plusmn/43.2 and 435.5/spl plusmn/29.6 ms, 60.2/spl plusmn/23.6 and 43.8/spl plusmn/11.3 ms, 56.71/spl plusmn/27.0 and 33.7/spl plusmn/14.5 ms, respectively) demonstrate the efficacy of this non-invasive method in identification of high-risk subgroup of post-myocardial infarction patients.
{"title":"Application of the parameters, reflecting ventricular repolarization inhomogeneity for identification of patients with life-threatening arrhythmias","authors":"J. Kaik, J. Lass, K. Maigas","doi":"10.1109/ICBEM.1998.666378","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666378","url":null,"abstract":"The correlation between the parameters reflecting ventricular repolarization inhomogeneity and the results of programmed ventricular stimulation was assessed in 58 post-myocardial infarction patients. Registration of increased QTc interval duration and QT and QTa interval dispersion in patients with high risk of sudden death as compared to the patients without it according to the results of programmed ventricular stimulation (469.5/spl plusmn/43.2 and 435.5/spl plusmn/29.6 ms, 60.2/spl plusmn/23.6 and 43.8/spl plusmn/11.3 ms, 56.71/spl plusmn/27.0 and 33.7/spl plusmn/14.5 ms, respectively) demonstrate the efficacy of this non-invasive method in identification of high-risk subgroup of post-myocardial infarction patients.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"47 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":"125689285","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.1998.666446
R.J. Tao, A. Zahedi
The objective of this paper is to present an accurate and reliable mathematical model which has been developed to determine the strength of magnetic field density in the vicinity of high voltage powerlines. The model has been developed based on measuring the strength of magnetic field around 220 kV powerlines. The accuracy of the model has also been tested in this study.
{"title":"Developing a mathematical model which represents magnetic field density around powerlines","authors":"R.J. Tao, A. Zahedi","doi":"10.1109/ICBEM.1998.666446","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666446","url":null,"abstract":"The objective of this paper is to present an accurate and reliable mathematical model which has been developed to determine the strength of magnetic field density in the vicinity of high voltage powerlines. The model has been developed based on measuring the strength of magnetic field around 220 kV powerlines. The accuracy of the model has also been tested in this study.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"19 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":"125711438","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.1998.666451
M. Cohen, C. Behrenbruch, I. Cosic
Acupuncture points and meridians have been shown to have distinct electrical characteristics. Acupuncture points have been found to have lower electrical impedance and acupuncture meridians represent low resistance pathways. The authors examined the spectral characteristics of a section of the large intestine acupuncture meridian in 10 healthy volunteers by inserting a broad-spectrum pulse at one point and detecting the output response further along the meridian. Analysis of the meridian transfer function revealed characteristic resonant frequencies that strongly coincide with the spectral components of Schumann resonances and the human EEG.
{"title":"Is there a link between acupuncture meridians, Earth-ionosphere resonances and cerebral activity?","authors":"M. Cohen, C. Behrenbruch, I. Cosic","doi":"10.1109/ICBEM.1998.666451","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666451","url":null,"abstract":"Acupuncture points and meridians have been shown to have distinct electrical characteristics. Acupuncture points have been found to have lower electrical impedance and acupuncture meridians represent low resistance pathways. The authors examined the spectral characteristics of a section of the large intestine acupuncture meridian in 10 healthy volunteers by inserting a broad-spectrum pulse at one point and detecting the output response further along the meridian. Analysis of the meridian transfer function revealed characteristic resonant frequencies that strongly coincide with the spectral components of Schumann resonances and the human EEG.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"8 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":"123360319","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.1998.666418
D. Wicks, M. Cohen
The use of magnetic fields as a therapeutic intervention dates back to antiquity and appears to be undergoing a resurgence. The use of magnets promises to provide a relatively cheap, safe and effective form of therapy, particularly in the treatment of pain and other chronic conditions. The scientific basis for this type of treatment is now well understood and it appears that very little basic or clinical research has been performed in this area. This paper describes how the personal experience of one individual led to the establishment of a company selling magnetic products and the documentation of a large number of anecdotal reports of success of this type of treatment.
{"title":"The therapeutic applications of static magnetic fields-a case study","authors":"D. Wicks, M. Cohen","doi":"10.1109/ICBEM.1998.666418","DOIUrl":"https://doi.org/10.1109/ICBEM.1998.666418","url":null,"abstract":"The use of magnetic fields as a therapeutic intervention dates back to antiquity and appears to be undergoing a resurgence. The use of magnets promises to provide a relatively cheap, safe and effective form of therapy, particularly in the treatment of pain and other chronic conditions. The scientific basis for this type of treatment is now well understood and it appears that very little basic or clinical research has been performed in this area. This paper describes how the personal experience of one individual led to the establishment of a company selling magnetic products and the documentation of a large number of anecdotal reports of success of this type of treatment.","PeriodicalId":213764,"journal":{"name":"Proceedings of the 2nd International Conference on Bioelectromagnetism (Cat. No.98TH8269)","volume":"1032 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":"116462944","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}
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