Pub Date : 1993-12-01DOI: 10.1109/IEMBS.1993.978986
C. Zakzewski, J.K. Li, D. Amory, E. Kalatzis-Manolakis
{"title":"Effect of waveshape on iontophoretic drug delivery","authors":"C. Zakzewski, J.K. Li, D. Amory, E. Kalatzis-Manolakis","doi":"10.1109/IEMBS.1993.978986","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978986","url":null,"abstract":"","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131124765","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 : 1993-11-15DOI: 10.1109/IEMBS.1993.978774
O. Escalona
Detection of ventricular late potentials (VLP) following myocardial infarction (MI) can be a useful risk indicator. A reliable novel approach for detecting abnormal VLP activity based on fractal dimension analysis is presented. Computation of the fractal dimension (δ) of the VLP "attractor" traced in the microvoltage, 3-dimensional space, provided a reliable parameter for detecting abnormal VLP activity in post-MI patients. A clinical study suggested that a value of δ > 1.30 can be a risk criterion.
{"title":"A fractal approach to the problem of ventricular late potential detection","authors":"O. Escalona","doi":"10.1109/IEMBS.1993.978774","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978774","url":null,"abstract":"Detection of ventricular late potentials (VLP) following myocardial infarction (MI) can be a useful risk indicator. A reliable novel approach for detecting abnormal VLP activity based on fractal dimension analysis is presented. Computation of the fractal dimension (δ) of the VLP \"attractor\" traced in the microvoltage, 3-dimensional space, provided a reliable parameter for detecting abnormal VLP activity in post-MI patients. A clinical study suggested that a value of δ > 1.30 can be a risk criterion.","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"122 2","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-11-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120922366","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 : 1993-10-28DOI: 10.1109/IEMBS.1993.978604
J. Leski
{"title":"Kardioassist - PC based system for modern ECG signal analysis. signal alignment method","authors":"J. Leski","doi":"10.1109/IEMBS.1993.978604","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978604","url":null,"abstract":"","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115276958","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 : 1993-10-28DOI: 10.1109/IEMBS.1993.978708
J. Puentes, C. Roux, M. Garreau, J. Coatrieux
displacements are quasi-homogeneous on a segment based analysis, a f i r s t approach to s tudy the twodimensional motions of the main coronary ar ter ies is propsed. A knowledge-based system extracts a n d interprets t h e d y n a m i c i n f o r m a t i o n . M o t i o n interpretations a r e obtained in two temporal image sequences a c q u i r e d in s t a n d a r d condi t ions, A prel iminary example of the system in te rpre ta t ion using declarative knowledge and d a t a representation is shown. T h e appl ica t ion of t h e homogeneous segment concept has permit ted to obtain a suitable arteries’ motion analysis. I . INTRODUCTION Visual interpretation includes perception, shape recognition, understanding, decision making and learning. Idcntification of useful entities in the image is one of the key problems to solve[l]. Interactions are simultaneous and varied, and a subjective inspection does not always differenciate between them. Knowledge based systems, aimed at the understanding of temporal image sequences, produce quantitative and qualitative evaluation of either objects or dynamic behaviors. Robot vision [ 2 ] and medical diagnosis (31, [4]. (51 are among the most important application fields. The objective in digital subtraction angiography is motivated by the need to work with qualitative, structural, morphological and kinetic properties. The analysis of cardiac movement is extremely complex. Normally, a highly qualified specialist is required to interpret these images. On the other hand, a great amount of the available angiography equipments take image sequences at one view angle and not at two angles simultaneously. Then, two dimensional motion analysis is rather used than three dimensional analysis. Most of the published works about the interpretation of cardiac angiographies are focused on the detection of lesions and do not include the temporal dimension. Usually, no more than two images are used. Studies are done with only two extreme positions of the heart, for example in ventricular analysis [6]. This work deals with knowledge based systems and image processing methods to analyse time-varying cardiovascular pictures. The temporal information given by the contrast medium circulation and the ECG signal is not considered in this work. Heart’s local and global behavior can be examined then, following only the coronary arteries’ displacements. This type of analysis relates three elements: artery’s position, magnitude and direction of its movement. The two-dimensional (2D) velocity vector associated to each artery’s point displacement is the basic data representation. The movement is qualitatively analysed in two temporal sequences recorded almost simultaneously with a biplane acquisition system R A 0 (right anterior oblique) and LAO (left anterior oblique) views. 11. METHOD OVERVIEW To achive qualitative kinetic description and motion analysis several steps must be accomplished: central line extraction, binary image representat
{"title":"Symbolic motion analysis in digital subtraction angiography: a preliminary study","authors":"J. Puentes, C. Roux, M. Garreau, J. Coatrieux","doi":"10.1109/IEMBS.1993.978708","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978708","url":null,"abstract":"displacements are quasi-homogeneous on a segment based analysis, a f i r s t approach to s tudy the twodimensional motions of the main coronary ar ter ies is propsed. A knowledge-based system extracts a n d interprets t h e d y n a m i c i n f o r m a t i o n . M o t i o n interpretations a r e obtained in two temporal image sequences a c q u i r e d in s t a n d a r d condi t ions, A prel iminary example of the system in te rpre ta t ion using declarative knowledge and d a t a representation is shown. T h e appl ica t ion of t h e homogeneous segment concept has permit ted to obtain a suitable arteries’ motion analysis. I . INTRODUCTION Visual interpretation includes perception, shape recognition, understanding, decision making and learning. Idcntification of useful entities in the image is one of the key problems to solve[l]. Interactions are simultaneous and varied, and a subjective inspection does not always differenciate between them. Knowledge based systems, aimed at the understanding of temporal image sequences, produce quantitative and qualitative evaluation of either objects or dynamic behaviors. Robot vision [ 2 ] and medical diagnosis (31, [4]. (51 are among the most important application fields. The objective in digital subtraction angiography is motivated by the need to work with qualitative, structural, morphological and kinetic properties. The analysis of cardiac movement is extremely complex. Normally, a highly qualified specialist is required to interpret these images. On the other hand, a great amount of the available angiography equipments take image sequences at one view angle and not at two angles simultaneously. Then, two dimensional motion analysis is rather used than three dimensional analysis. Most of the published works about the interpretation of cardiac angiographies are focused on the detection of lesions and do not include the temporal dimension. Usually, no more than two images are used. Studies are done with only two extreme positions of the heart, for example in ventricular analysis [6]. This work deals with knowledge based systems and image processing methods to analyse time-varying cardiovascular pictures. The temporal information given by the contrast medium circulation and the ECG signal is not considered in this work. Heart’s local and global behavior can be examined then, following only the coronary arteries’ displacements. This type of analysis relates three elements: artery’s position, magnitude and direction of its movement. The two-dimensional (2D) velocity vector associated to each artery’s point displacement is the basic data representation. The movement is qualitatively analysed in two temporal sequences recorded almost simultaneously with a biplane acquisition system R A 0 (right anterior oblique) and LAO (left anterior oblique) views. 11. METHOD OVERVIEW To achive qualitative kinetic description and motion analysis several steps must be accomplished: central line extraction, binary image representat","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"179 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115458404","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 : 1993-10-28DOI: 10.1109/IEMBS.1993.978951
R. Galloway, R. Maciunas, W. Bass, D. Crouch
A device is presented which allows for the rapid display of surgical position and trajectory during neurosurgical procedures. The device’s position is determined by an optical triangulation device with an accuracy of approximately 0.1”. Surgical position is displayed on preoperatively obtained tomograms including Computed Tomography, Magnetic Resonance Imaging and Positron Emission Tomography scans.
{"title":"An optical device for interactive, image-guided neurosurgery","authors":"R. Galloway, R. Maciunas, W. Bass, D. Crouch","doi":"10.1109/IEMBS.1993.978951","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978951","url":null,"abstract":"A device is presented which allows for the rapid display of surgical position and trajectory during neurosurgical procedures. The device’s position is determined by an optical triangulation device with an accuracy of approximately 0.1”. Surgical position is displayed on preoperatively obtained tomograms including Computed Tomography, Magnetic Resonance Imaging and Positron Emission Tomography scans.","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115467250","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 : 1993-10-28DOI: 10.1109/IEMBS.1993.978561
M. Brown, W. J. Williams, A. Hero
{"title":"Non-orthogonal Gabor representation of event-related potentials","authors":"M. Brown, W. J. Williams, A. Hero","doi":"10.1109/IEMBS.1993.978561","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978561","url":null,"abstract":"","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124363946","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 : 1993-10-28DOI: 10.1109/IEMBS.1993.979227
S. Ueno, M. lwasaka, K. Shiokawa
A possible influence of intense magnetic fields on the embryonic development of frogs was studied in reference to a potentiat hazardous problem in magnetic resonance imaging technology. We concluded that static magnetic fields up to 8 T do not appreciably affect the rapid cleavage and the following cell multiplication and differentiation in Xenopus laevis . We have also studied embryonic development of Xenopus laevis in 40 nT magnetic fields, and obtained similar results.
{"title":"Early embryonic development of xenopus laevis in 8 T and 40 nT magnetic fields","authors":"S. Ueno, M. lwasaka, K. Shiokawa","doi":"10.1109/IEMBS.1993.979227","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.979227","url":null,"abstract":"A possible influence of intense magnetic fields on the embryonic development of frogs was studied in reference to a potentiat hazardous problem in magnetic resonance imaging technology. We concluded that static magnetic fields up to 8 T do not appreciably affect the rapid cleavage and the following cell multiplication and differentiation in Xenopus laevis . We have also studied embryonic development of Xenopus laevis in 40 nT magnetic fields, and obtained similar results.","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123086308","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 : 1993-10-28DOI: 10.1109/IEMBS.1993.979244
A. Diaspro, M. Nizzari, M. Bertolotto, C. Nicolini
{"title":"Application of differential polarization light scattering to the study of bacterial cells","authors":"A. Diaspro, M. Nizzari, M. Bertolotto, C. Nicolini","doi":"10.1109/IEMBS.1993.979244","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.979244","url":null,"abstract":"","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116895285","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 : 1993-10-28DOI: 10.1109/IEMBS.1993.978868
Max Schaldach, A. Urbaszek, Helmut Hutten
Abstrod The aim of today’s pacemaker technology is to maintain a high quality of life and physical perfomace of the patient When natural sinus rhythm i s absent, a series of sensors with complex microelectronic contml circuits meets the need for rate-adaptive pacemaker systems while preserving AV synchrony. But only closed loop control has the potential to restore natural regulation. Intracardiac impedance measurements allow the monitoring of the contractile status of the heart, which depends mainly on the sympathetic drive. The ANS-contmlled pacemaker, which uses the stimulating electrode at the same time as the measuring electrode, is of special cIinical advantage The clinical evaluation of this pacing system in more than 200 patients confirmed adequate rate adaptation. Future developments are likely to make use of this possibility for eg arrhythmia prevention, intensive care monitoring o r as already implemented in conjunction with cardiomyoplasty.
{"title":"New concepts in pacemaker technology","authors":"Max Schaldach, A. Urbaszek, Helmut Hutten","doi":"10.1109/IEMBS.1993.978868","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978868","url":null,"abstract":"Abstrod The aim of today’s pacemaker technology is to maintain a high quality of life and physical perfomace of the patient When natural sinus rhythm i s absent, a series of sensors with complex microelectronic contml circuits meets the need for rate-adaptive pacemaker systems while preserving AV synchrony. But only closed loop control has the potential to restore natural regulation. Intracardiac impedance measurements allow the monitoring of the contractile status of the heart, which depends mainly on the sympathetic drive. The ANS-contmlled pacemaker, which uses the stimulating electrode at the same time as the measuring electrode, is of special cIinical advantage The clinical evaluation of this pacing system in more than 200 patients confirmed adequate rate adaptation. Future developments are likely to make use of this possibility for eg arrhythmia prevention, intensive care monitoring o r as already implemented in conjunction with cardiomyoplasty.","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117167296","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 : 1993-10-28DOI: 10.1109/IEMBS.1993.979154
R.E. Mayagoitia
On the initiative of the Mayor and with the advice of a biomedical engineer the City of Oaxaca began a project to make the center of the city accessible to the disabled, applying access standards previously developed in Mexico. The first stage has been finished, connecting the most important points in the center by wheelchair-accessible routes. There are people with disabilities the world over. However, it is uncommon to see them on the street or in public places in Mexico, where many physical (as well as social) barriers exist. There is v e q litZle legislation regarding access. Building codes are out of date in terms of %cess and urgently need to be revised. The regulations for Mexico City concentrate on human rights aspects and mention access in passing [l]. The= is state legislation in the State of Durango, where few specifics are given. The standard of the Ministry of Health is the only legislation applicable in the entire country and even though it is very specific it is only required of health care facilities [3]. Other national health care institutions, such as the Mexican Institute of Social Security, have their own standard. in accordance with but not identical to the Ministry of Health standard [41. In both cases access is obligatory only in new or hereafter remodeled health care facilities. Other entities offering disabled access do so out of good will and usually to their own intuitive standards. The health facility standards [3,4] were developed and revised by a multidisciplinary and multi-institutional team IS], where one of the members was a biomedical engineer. This person was asked by the Mayor of the City of Oaxaca to devise a project to make the center of the city accessible. Mexican standards were used.
{"title":"Achieving disabled access in the city of Oaxaca, Mexico","authors":"R.E. Mayagoitia","doi":"10.1109/IEMBS.1993.979154","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.979154","url":null,"abstract":"On the initiative of the Mayor and with the advice of a biomedical engineer the City of Oaxaca began a project to make the center of the city accessible to the disabled, applying access standards previously developed in Mexico. The first stage has been finished, connecting the most important points in the center by wheelchair-accessible routes. There are people with disabilities the world over. However, it is uncommon to see them on the street or in public places in Mexico, where many physical (as well as social) barriers exist. There is v e q litZle legislation regarding access. Building codes are out of date in terms of %cess and urgently need to be revised. The regulations for Mexico City concentrate on human rights aspects and mention access in passing [l]. The= is state legislation in the State of Durango, where few specifics are given. The standard of the Ministry of Health is the only legislation applicable in the entire country and even though it is very specific it is only required of health care facilities [3]. Other national health care institutions, such as the Mexican Institute of Social Security, have their own standard. in accordance with but not identical to the Ministry of Health standard [41. In both cases access is obligatory only in new or hereafter remodeled health care facilities. Other entities offering disabled access do so out of good will and usually to their own intuitive standards. The health facility standards [3,4] were developed and revised by a multidisciplinary and multi-institutional team IS], where one of the members was a biomedical engineer. This person was asked by the Mayor of the City of Oaxaca to devise a project to make the center of the city accessible. Mexican standards were used.","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117226705","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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