Pub Date : 1992-10-01DOI: 10.1109/IEMBS.1992.5761066
A. Baykal, Y. Z. Ider, H. Koymen
In this study, heart sounds of 10 normal subjects are recorded in three different respiratory states. These signals are analyzed and the changes of model parameters with respiration are studied. As a result, it is observed that the frequency of modes do not vary during respiration while the energy of modes significantly differ between inspiration and expiration. The results of the study are discussed with respect to proposed heart sound generation mechanisms.
{"title":"Respiration related changes of PCG model parameters","authors":"A. Baykal, Y. Z. Ider, H. Koymen","doi":"10.1109/IEMBS.1992.5761066","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761066","url":null,"abstract":"In this study, heart sounds of 10 normal subjects are recorded in three different respiratory states. These signals are analyzed and the changes of model parameters with respiration are studied. As a result, it is observed that the frequency of modes do not vary during respiration while the energy of modes significantly differ between inspiration and expiration. The results of the study are discussed with respect to proposed heart sound generation mechanisms.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"39 1","pages":"473-474"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77680729","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.1992.5761068
Zhenyu Guo, L. Durand, Howard C. Lee, L. Allard, P. Stein
A three layers feed-forward back-propagation neural network was trained to classify bioprosthetic valve closure sounds from 47 patients with a porcine bioprosthetic valve inserted in the aortic position. Twenty-four patients had a normal valve and 23 a degenerated one. Twelve linear prediction coefficients computed from the closure sounds were used as the network input The neural network yielded 89% correct classification in an evaluation using the leave-one-out method. This study confirmed the potential of heart sound classification by using a neural network.
{"title":"Classification of bioprosthetic valve closure sounds by a neural network using linear prediction coefficients","authors":"Zhenyu Guo, L. Durand, Howard C. Lee, L. Allard, P. Stein","doi":"10.1109/IEMBS.1992.5761068","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761068","url":null,"abstract":"A three layers feed-forward back-propagation neural network was trained to classify bioprosthetic valve closure sounds from 47 patients with a porcine bioprosthetic valve inserted in the aortic position. Twenty-four patients had a normal valve and 23 a degenerated one. Twelve linear prediction coefficients computed from the closure sounds were used as the network input The neural network yielded 89% correct classification in an evaluation using the leave-one-out method. This study confirmed the potential of heart sound classification by using a neural network.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"15 1","pages":"477-478"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78181310","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.1992.5762111
C. Clem, J. Rigaut
Static and dynamic 3-D modeling and visualization of the normal and pathological architecture of the nasal epithelium have been achieved. Positions, sizes, shapes and orientations of the nuclei as well as the basal lamina and the lumen have been used for the 3-D representation of the epithelium. Static modeling, based on an expert system to estimate model parameters, has first been applied to simulate the normal, metaplasic and dysplasic stages of the nasal epithelium. Dynamic modeling, starting from a static representation of a normal or a pathological stage, uses the starting values of the cell proliferation parameters and simulates a tissue growth process.
{"title":"3-D Modeling by computer simulation of the evolution of normal, metaplastic and dysplastic stages of the nasal epithelium","authors":"C. Clem, J. Rigaut","doi":"10.1109/IEMBS.1992.5762111","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5762111","url":null,"abstract":"Static and dynamic 3-D modeling and visualization of the normal and pathological architecture of the nasal epithelium have been achieved. Positions, sizes, shapes and orientations of the nuclei as well as the basal lamina and the lumen have been used for the 3-D representation of the epithelium. Static modeling, based on an expert system to estimate model parameters, has first been applied to simulate the normal, metaplasic and dysplasic stages of the nasal epithelium. Dynamic modeling, starting from a static representation of a normal or a pathological stage, uses the starting values of the cell proliferation parameters and simulates a tissue growth process.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"35 1","pages":"1942-1943"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80005502","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.1992.5761847
D. McCreery, T. Yuen, W. Agnew, L. Bullara
Seven hours of continuous stimulation in the cochlear nucleus with chronically implanted activated iridium microelectrodes resulted in neural injury characterized primarily by a localized zone of severe extracellular edema accompanied by abnormal cellular elements. The severity of the damage was correlated positively with the stimulus frequency and charge per phase, but a correlation with the geometric charge density was not obvious.
{"title":"Neural damage from continuous microstimulation in the cochlear nucleus; correlation with stimulus parameters","authors":"D. McCreery, T. Yuen, W. Agnew, L. Bullara","doi":"10.1109/IEMBS.1992.5761847","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761847","url":null,"abstract":"Seven hours of continuous stimulation in the cochlear nucleus with chronically implanted activated iridium microelectrodes resulted in neural injury characterized primarily by a localized zone of severe extracellular edema accompanied by abnormal cellular elements. The severity of the damage was correlated positively with the stimulus frequency and charge per phase, but a correlation with the geometric charge density was not obvious.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"112 2 1","pages":"1396-1397"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80016867","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.1992.5761520
M. Chambrin, C. Chopin, J. Mangalaboyi, K. Hintzen
In order to avoid the inconvenients related to available methods of weaning (risk of hypo and hyperventlation, lung hyperinflation, and necessity to modify settings frequently to meet the patient's needs), we propose a new mode of ventilation whose main characteristics are : controlled tidal volume, decreasing inspiratory flow pattern, zero flow cycled, automatic regulation from spontaneous breathing to volumetric controlled ventilation according to patient's needs. Using a prototype, we have compared this new mode with controlled ventilation. With respect of minute ventilation, we found a significant decrease in peak airway pressure whereas there were no difference in mean airway pressure and blood gas results. This mode has then been implemented in a ventilator
{"title":"AutoRegulated Inspiratory Support ventilation","authors":"M. Chambrin, C. Chopin, J. Mangalaboyi, K. Hintzen","doi":"10.1109/IEMBS.1992.5761520","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761520","url":null,"abstract":"In order to avoid the inconvenients related to available methods of weaning (risk of hypo and hyperventlation, lung hyperinflation, and necessity to modify settings frequently to meet the patient's needs), we propose a new mode of ventilation whose main characteristics are : controlled tidal volume, decreasing inspiratory flow pattern, zero flow cycled, automatic regulation from spontaneous breathing to volumetric controlled ventilation according to patient's needs. Using a prototype, we have compared this new mode with controlled ventilation. With respect of minute ventilation, we found a significant decrease in peak airway pressure whereas there were no difference in mean airway pressure and blood gas results. This mode has then been implemented in a ventilator","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"9 1","pages":"2419-2420"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80029608","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.1992.5762044
M. Kallergi, W. Qian, L. Clarke, Huai-Dong Li
Planar gamma camera Images of spherical phantoms filled with phosphorous-32 (32Ρ) are filtered with a new restoration technique which uses an order-statistic non-linear filter for noise suppression and a neural network for image restoration. The proposed method reduces Image noise effectively while preserving Image content and counts and restores the data consistently with source-to-detector distance or source size resulting in an effective attenuation coefficient for 32P. The new filter is compared to the Wiener filter for restoration in terms of error Images and attenuation measurements.
{"title":"Neural network restoration of gamma camera bremsstrahlung images","authors":"M. Kallergi, W. Qian, L. Clarke, Huai-Dong Li","doi":"10.1109/IEMBS.1992.5762044","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5762044","url":null,"abstract":"Planar gamma camera Images of spherical phantoms filled with phosphorous-32 (32Ρ) are filtered with a new restoration technique which uses an order-statistic non-linear filter for noise suppression and a neural network for image restoration. The proposed method reduces Image noise effectively while preserving Image content and counts and restores the data consistently with source-to-detector distance or source size resulting in an effective attenuation coefficient for 32P. The new filter is compared to the Wiener filter for restoration in terms of error Images and attenuation measurements.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"25 1","pages":"1795-1796"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80169352","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.1992.5761687
R. Grzeszczuk, N. Alperin, D. Levin, Yue Cao, K. K. Tan, C. Pelizzari
MRA and conventional angiographic data sets are registered in order to produce an integrated 3-D model of intracranial vasculature with high spatial and temporal resolution. The correlation is achieved with help of a 3-D digitizer and a retrospective surface matching program.
{"title":"Multimodality intracranial angiography: Registration and integration of conventional angiograms and MRA data","authors":"R. Grzeszczuk, N. Alperin, D. Levin, Yue Cao, K. K. Tan, C. Pelizzari","doi":"10.1109/IEMBS.1992.5761687","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761687","url":null,"abstract":"MRA and conventional angiographic data sets are registered in order to produce an integrated 3-D model of intracranial vasculature with high spatial and temporal resolution. The correlation is achieved with help of a 3-D digitizer and a retrospective surface matching program.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"11 1","pages":"2783-2784"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80498358","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.1992.5761018
J. Zelano, W. Ko, W. Lazenby, O. Isom, K. Krieger
In order to evaluate the efficacy of counterpulsation for different cardiac assist device configurations, a valveless single orifice polyurethane ventricle was implanted on the brachlocephalic artery in sheep(n=14) to provide extra-aortic counterpulsation. In parallel, an intra-aortic balloon was placed in the descending aorta. Both devices were pneumatically driven with a standard intra-aortic balloon pump console at a preload of 40°c. Severe cardiac failure was induced with high dosages of esmolol. Measured parameters were aortic pressure and flow, and left ventricular pressure. Tension-time index, total aortic flow, end diastolic pressure, aortic input impedance, and left ventricular power output were computed. Results indicate that the fundamental components of aortic input impedance and left ventricular power output are reliable predictors of the efficacy of counterpulsation for the experimental model used in this study.
{"title":"Intra-aortic balloon versus extra-aortic counterpulsation in severe cardiac failure differences in aortic input impedance and left ventricular power generation","authors":"J. Zelano, W. Ko, W. Lazenby, O. Isom, K. Krieger","doi":"10.1109/IEMBS.1992.5761018","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761018","url":null,"abstract":"In order to evaluate the efficacy of counterpulsation for different cardiac assist device configurations, a valveless single orifice polyurethane ventricle was implanted on the brachlocephalic artery in sheep(n=14) to provide extra-aortic counterpulsation. In parallel, an intra-aortic balloon was placed in the descending aorta. Both devices were pneumatically driven with a standard intra-aortic balloon pump console at a preload of 40°c. Severe cardiac failure was induced with high dosages of esmolol. Measured parameters were aortic pressure and flow, and left ventricular pressure. Tension-time index, total aortic flow, end diastolic pressure, aortic input impedance, and left ventricular power output were computed. Results indicate that the fundamental components of aortic input impedance and left ventricular power output are reliable predictors of the efficacy of counterpulsation for the experimental model used in this study.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"102 1","pages":"373-374"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80503484","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.1992.5762253
L. Domas, A. Laurent, M. Wassef, A. Bailly, J. Merland
This work presents an Image processing method applied to morpho-analysis of embolization particles. This method Is used to make measurements necessary to the calculation of an “occluion index” that describes the occlusion Quality of a particle.
{"title":"A simple method for morpho-analysis of embolization particles","authors":"L. Domas, A. Laurent, M. Wassef, A. Bailly, J. Merland","doi":"10.1109/IEMBS.1992.5762253","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5762253","url":null,"abstract":"This work presents an Image processing method applied to morpho-analysis of embolization particles. This method Is used to make measurements necessary to the calculation of an “occluion index” that describes the occlusion Quality of a particle.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"42 1","pages":"2235-2236"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79243436","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.1992.5761965
P. Cudd, M. S. Hawley
The development of a low cost integrated assistance system based around small/portable IBM compatible personal computers is presented. The system design and issues that affect the current system and those of future systems are discussed.
{"title":"Inexpensive PC-based integrated control systems for severely physically disabled people","authors":"P. Cudd, M. S. Hawley","doi":"10.1109/IEMBS.1992.5761965","DOIUrl":"https://doi.org/10.1109/IEMBS.1992.5761965","url":null,"abstract":"The development of a low cost integrated assistance system based around small/portable IBM compatible personal computers is presented. The system design and issues that affect the current system and those of future systems are discussed.","PeriodicalId":6457,"journal":{"name":"1992 14th Annual International Conference of the IEEE Engineering in Medicine and Biology Society","volume":"211 1","pages":"1648-1649"},"PeriodicalIF":0.0,"publicationDate":"1992-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79401065","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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