Pub Date : 1992-10-01DOI: 10.1109/IEMBS.1992.5761400
Sining Wang, L. J. Leon
Action potential propagation in a strand of cardiac fibers was studied using a model developed from potential theory which incorporates both microscopic structural details and realistic membrane dynamics. The conduction velocity and τfoot of the propagating transmembrane action potential were found to vary directly with the density of fibers within the bundle, whereas Vmax varied in the opposite direction.
{"title":"Action potential propagation in a thin strand of cardiac fibers","authors":"Sining Wang, L. J. Leon","doi":"10.1109/IEMBS.1992.5761400","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761400","url":null,"abstract":"Action potential propagation in a strand of cardiac fibers was studied using a model developed from potential theory which incorporates both microscopic structural details and realistic membrane dynamics. The conduction velocity and τfoot of the propagating transmembrane action potential were found to vary directly with the density of fibers within the bundle, whereas Vmax varied in the opposite direction.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"11 1","pages":"2354-2355"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88315018","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 : 1992-10-01DOI: 10.1109/IEMBS.1992.5761566
M. Neuman, D. Fleming, T. Baird, Scott Lambert
A special transthoracic electrical impedance infant respiration monitor that can sample eight pairs of electrodes has been used to measure breathing patterns in newborn infants. Quasi-simultaneous recordings have been made and used to determine the breath amplitude and duration of spontaneously occurring apneas during two-hour sessions. Preliminary results from eight infants have shown that breath amplitudes usually vary by factors of six to ten, cardiogenic artifact varies from 6 to 27% of mean breath amplitude for different electrode placements, and the apparent duration of apnea is often different for different electrode pairs.
{"title":"Monitoring infant respiration using an Eight-channel transthoracic impedance monitor","authors":"M. Neuman, D. Fleming, T. Baird, Scott Lambert","doi":"10.1109/IEMBS.1992.5761566","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761566","url":null,"abstract":"A special transthoracic electrical impedance infant respiration monitor that can sample eight pairs of electrodes has been used to measure breathing patterns in newborn infants. Quasi-simultaneous recordings have been made and used to determine the breath amplitude and duration of spontaneously occurring apneas during two-hour sessions. Preliminary results from eight infants have shown that breath amplitudes usually vary by factors of six to ten, cardiogenic artifact varies from 6 to 27% of mean breath amplitude for different electrode placements, and the apparent duration of apnea is often different for different electrode pairs.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"13 1","pages":"2516-2517"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88328506","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 : 1992-10-01DOI: 10.1109/IEMBS.1992.5762252
G. Colliot, O. Lejeune, S. de Bentzmann, M. Tajani, N. Bonnet, E. Hirsch
The present paper describes the developement of an image analysis system devoted to applications in histology and electronic microscopy. The main characteristic of the system is its capacity to work simultaneously on more than one field of view and to handle different working magnifications. Finally it generates a complete map of analyzed sections.
{"title":"Contextual analysis for both light and electronic microscopy applications","authors":"G. Colliot, O. Lejeune, S. de Bentzmann, M. Tajani, N. Bonnet, E. Hirsch","doi":"10.1109/IEMBS.1992.5762252","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5762252","url":null,"abstract":"The present paper describes the developement of an image analysis system devoted to applications in histology and electronic microscopy. The main characteristic of the system is its capacity to work simultaneously on more than one field of view and to handle different working magnifications. Finally it generates a complete map of analyzed sections.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"2002 1","pages":"2233-2234"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88385672","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 : 1992-10-01DOI: 10.1109/IEMBS.1992.5761850
Robert J. De Luca, J. Sweeney, T. Brandon
In this paper we describe a novel electrical stimulation approach that can potentially increase the efficiency with which skeletal muscle can be used to provide power for cardiac assistance. Results are presented from acute animal studies in which a nerve cuff electrode array is used to selectively stimulate the three functionally distinct regions of the latissimus dorsi muscle.
{"title":"Selective electrical stimulation of latissimus dorsi muscle","authors":"Robert J. De Luca, J. Sweeney, T. Brandon","doi":"10.1109/IEMBS.1992.5761850","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761850","url":null,"abstract":"In this paper we describe a novel electrical stimulation approach that can potentially increase the efficiency with which skeletal muscle can be used to provide power for cardiac assistance. Results are presented from acute animal studies in which a nerve cuff electrode array is used to selectively stimulate the three functionally distinct regions of the latissimus dorsi muscle.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"75 1","pages":"1402-1403"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86171272","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 : 1992-10-01DOI: 10.1109/IEMBS.1992.5761696
R. Nerem
Cellular engineering applies the principles and methods of engineering to the problems of cell and molecular biology of both a basic and applied nature. As biomedical engineering has shifted from the organ and tissue level to the cellular and subcellular level, cellular engineering has emerged as a new area. Cellular engineering includes the role of engineering in both basic cell biology research and in the making of products which use living cells, e.g tissue engineering and bioprocess engineering. The former involves the use of living cells in the development of biological substitutes for the restoration or replacement of function. An example of this is the regeneration of nerves. The latter i.e. bioprocess engineering, involves the use of living cells to manufacture a biochemical product e.g. through the use of recombinant DNA technology. In fact, as biomedical engineering has expanded to include the cellular level, and bioprocess engineering has shifted in interest from microbial organisms to include mammalian cells, there are intellectual issues in which an interest is shared by those two formerly separate areas of engineering activity. Cellular engineering thus transcends the field of biomedical engineering. More than that, it represents a response of engineering to the biological revolution which has unfolded over the past several decades.
{"title":"An introduction to cellular engineering","authors":"R. Nerem","doi":"10.1109/IEMBS.1992.5761696","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761696","url":null,"abstract":"Cellular engineering applies the principles and methods of engineering to the problems of cell and molecular biology of both a basic and applied nature. As biomedical engineering has shifted from the organ and tissue level to the cellular and subcellular level, cellular engineering has emerged as a new area. Cellular engineering includes the role of engineering in both basic cell biology research and in the making of products which use living cells, e.g tissue engineering and bioprocess engineering. The former involves the use of living cells in the development of biological substitutes for the restoration or replacement of function. An example of this is the regeneration of nerves. The latter i.e. bioprocess engineering, involves the use of living cells to manufacture a biochemical product e.g. through the use of recombinant DNA technology. In fact, as biomedical engineering has expanded to include the cellular level, and bioprocess engineering has shifted in interest from microbial organisms to include mammalian cells, there are intellectual issues in which an interest is shared by those two formerly separate areas of engineering activity. Cellular engineering thus transcends the field of biomedical engineering. More than that, it represents a response of engineering to the biological revolution which has unfolded over the past several decades.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"21 1","pages":"2800-2800"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86300650","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 : 1992-10-01DOI: 10.1109/IEMBS.1992.5761873
C. Martinez, C. Doncarli, P. Guiheneuc
A new model of peripheral nerve Compound Action Potentials (CNAPs) is proposed in this paper. After a brief description of existing models, a general synthesis method, based on a random distribution is described. Examples of synthetic CNAPs, generated according to the model, are presented.
{"title":"Compound Nerve Action Potential modelization and synthesis","authors":"C. Martinez, C. Doncarli, P. Guiheneuc","doi":"10.1109/IEMBS.1992.5761873","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761873","url":null,"abstract":"A new model of peripheral nerve Compound Action Potentials (CNAPs) is proposed in this paper. After a brief description of existing models, a general synthesis method, based on a random distribution is described. Examples of synthetic CNAPs, generated according to the model, are presented.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"01 1","pages":"1454-1456"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86508634","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 : 1992-10-01DOI: 10.1109/IEMBS.1992.5761471
M. Kraemer, H. Polaschegg
In hemodialysis, the supervision and control of body temperature and thermal energy balance in the extracorporeal circuit can help to avoid hypotensive episodes. A feedback control of these parameters, which is not performed in today's treatments, can be achieved by influencing dialysate temperature. A Blood Temperature Monitor (BTM) was built which measures arterial and venous blood temperatures and performs control on either body temperature or extracorporeal thermal energy balance automatically. The control algorithms and examples from clinical applications are presented.
{"title":"Control of blood temperature and thermal energy balance during hemodialysis","authors":"M. Kraemer, H. Polaschegg","doi":"10.1109/IEMBS.1992.5761471","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761471","url":null,"abstract":"In hemodialysis, the supervision and control of body temperature and thermal energy balance in the extracorporeal circuit can help to avoid hypotensive episodes. A feedback control of these parameters, which is not performed in today's treatments, can be achieved by influencing dialysate temperature. A Blood Temperature Monitor (BTM) was built which measures arterial and venous blood temperatures and performs control on either body temperature or extracorporeal thermal energy balance automatically. The control algorithms and examples from clinical applications are presented.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"70 1","pages":"2299-2300"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86246671","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 : 1992-10-01DOI: 10.1109/IEMBS.1992.5761927
P. Limoli, L. D'Amato, A. Giulotto, A. Mantovani, M. Franzetti, Gilardi, Pio Albergo Trivulzio
The authors present new possibilities offered by virtual vision rehabilitation. Physical presence of patients is not necessary for selecting magnifying systems and exercises are designed “ad personam” allowing maximum efficiency in the rehabilitation of visually disabled persons.
{"title":"Virtual visual rehabilitation","authors":"P. Limoli, L. D'Amato, A. Giulotto, A. Mantovani, M. Franzetti, Gilardi, Pio Albergo Trivulzio","doi":"10.1109/IEMBS.1992.5761927","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761927","url":null,"abstract":"The authors present new possibilities offered by virtual vision rehabilitation. Physical presence of patients is not necessary for selecting magnifying systems and exercises are designed “ad personam” allowing maximum efficiency in the rehabilitation of visually disabled persons.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"79 1","pages":"1566-1567"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86520011","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 : 1992-10-01DOI: 10.1109/IEMBS.1992.5762095
M. J. Carreira, D. Cabello, A. Mosquera, M. G. Penedo
An important task in image understanding systems is the segmentation process. In this work, we present a low-level algorithm which integrates statistical and spatial information for segmenting chest X-ray images. The goal of this algorithm is to generate a reasonable number of regions in the image to make easier the high-level analysis towards obtaining a symbolic description of the image.
{"title":"Medical images segmentation using region and edges information","authors":"M. J. Carreira, D. Cabello, A. Mosquera, M. G. Penedo","doi":"10.1109/IEMBS.1992.5762095","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5762095","url":null,"abstract":"An important task in image understanding systems is the segmentation process. In this work, we present a low-level algorithm which integrates statistical and spatial information for segmenting chest X-ray images. The goal of this algorithm is to generate a reasonable number of regions in the image to make easier the high-level analysis towards obtaining a symbolic description of the image.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"1 1","pages":"1909-1910"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82943431","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 : 1992-10-01DOI: 10.1109/IEMBS.1992.5761994
M. Cheney, D. Isaacson, E. Somersalo, E. Isaacson
Impedance imaging systems apply currents to the surface of a body, measure the induced voltages on the surface, and from this information reconstruct an approximation to the electrical impedance in the interior of the body. This paper discusses a layer-stripping method for solving the reconstruction problem. The idea is to first find the impedance on the boundary, and then use this information to “strip away” the outermost layer. The process is then repeated, and the medium is stripped away, layer-by-layer. Here we show how to use this method with experimental data.
{"title":"Layer-stripping reconstruction algorithm for impedance imaging","authors":"M. Cheney, D. Isaacson, E. Somersalo, E. Isaacson","doi":"10.1109/IEMBS.1992.5761994","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761994","url":null,"abstract":"Impedance imaging systems apply currents to the surface of a body, measure the induced voltages on the surface, and from this information reconstruct an approximation to the electrical impedance in the interior of the body. This paper discusses a layer-stripping method for solving the reconstruction problem. The idea is to first find the impedance on the boundary, and then use this information to “strip away” the outermost layer. The process is then repeated, and the medium is stripped away, layer-by-layer. Here we show how to use this method with experimental data.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"1 1","pages":"1694-1695"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82636570","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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