Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ最新文献

{"title":"Acute pulmonary edema assessed by electrical impedance imaging","authors":"J. Newell, D. Isaacson, G. Saulnier, M. Cheney, D. Gisser","doi":"10.1109/IEMBS.1993.978445","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978445","url":null,"abstract":"Acute Iung injury, with decreased cardiac output, and arterid PO2 and increased pulmonary arterial pressure was produced by intravenous injection of oleic acid in dogs. During the next three hours, resistivity decreased in two regions of the chest. corresponding lo the lungs, as measured by elecuical impedance imaging. Overall resistivity in the enlire image decreased from 179 to 143 ohm-cm in 3 hours, while the peak lung resistivity decreascd from 248 to 207 ohm-cm. We conclude that impcdance imaging holds promise for clinical monitoring of acute pulmonary edema. Introduction Pulmonary edema and Adult Respiratory Discress Syndrome remain important complications following major surgery and multiple muma. Clinical diagnosis relies on physiological tests of gas exchange, including merial blood gas measurements. wilh calculation of intrapulmonary shunt, auscultation, and chest radiographs. The present study was conducted to determine if Electrical Impedance Imaging can also provide a clinically useful assessment of pulmonary edema. Electrical Impedance Imaging is a technique for forming images of the interior of the body based on electrical measurements made From electrodes applied to the skin. Known currencs are passed through the bcdy, and the voltages resulting on the electrodes are measured. A reconstruction algorithm then uses these data to solve the inverse problem and clsplay a map or image of the resistivity in the region surrounded by the electrodes. Since significant decreases in resistivity may occur in the lungs during edema formation, they might be detectabIe by Impedance Imaging. This hypothesis is an extension of an earlier study which showed decreases in overall thoracic resistivity in pulmonary edema patients [ I ] , We have studied dogs wilh pulmonary edema induced by intravenous infusion of oleic acid, a well-studied model of acule lung injury [2]. Images of the lungs showed progressive localized decreases in resistiviv throughout Ihe edema forma-","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"69 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":"128184482","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}

{"title":"Associative and non-associative neural network design for sensory integration","authors":"A. Srivastava, R. Su","doi":"10.1109/IEMBS.1993.978538","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978538","url":null,"abstract":"","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"15 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":"121698957","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}

{"title":"Behavior of offset voltages of silver/silver chloride electrodes in saline","authors":"I. Dendo","doi":"10.1109/IEMBS.1993.979252","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.979252","url":null,"abstract":"The electrode potential dilTerences or of/sef rioolrages of silverlsiIver chloride electrodes were experimentally studied at the transient staces of rapid change in environments; temperature and solution flow. The maximum transient voltage was k3SpVI\"C to rapid change in temperature and the temperature coeffcients at steady state were tl to iI5pVI\"C. The voltage fluctdon caused by solution flows, called motion atfifacrs, was or tbe order of 05mV to the flow rate of 70cmlmin.","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"105 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":"121764500","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}

{"title":"Time-recursive solution to the inverse problem of electrocardiography: a model-based approach","authors":"D. Joly, Y. Goussard, P. Savard","doi":"10.1109/IEMBS.1993.978823","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978823","url":null,"abstract":"This paper presents a new approach to the estimation of epicardial potentials from measured body surface potentials. This problem is ill-posed, and regularization techniques, through incorporation of a priori information on the solution, provide an efficient way of improving the quality of the estimates. During a cardiac cycle, the time-evolution of the epicardial potentials presents a very structured character which is the consequence of underlying propagation phenomena. In order to account for this a priori information, we introduce a linear prediction model that explicitly relates the epicardial potentials at two consecutive time instants. The linear prediction model, along with the usual relationship between epicardial and body surface potentials, makes up a state-space representation of the system. Epicardial potentials can then be estimated using efficient time-recursive techniques such as Kalman filtering. Simulation results obtained with real epicardial data indicate the validity of the linear prediction model; comparison of the reconstructed epicardial potentials with those produced by existing methods confirm the interest of the ap-","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"33 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":"115748285","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}

{"title":"Isoilated word recognition of deaf speech using tewe delay neiworks","authors":"R. Kota, K. Abdelhamied, E. Goshorn","doi":"10.1109/IEMBS.1993.979177","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.979177","url":null,"abstract":"A prototype system for deaf speech recognition using time delay neural networks is proposed. The prototype system uses spectral information and other features that are known to be present in deaf speech. The network was trained using the backpropogation learning rule on a vocabulary of 20 words selected from the Modified Rhyme Test. The prototype system was tested using the speech of two profoundly deaf speakers. For speaker 1 with a speech intelligibility rating of 75.6% the network gave a peak recognition rate of 85%. For speaker 2 with a speech intelligibility rating of 35.6% the network gave a peak recognition rate of 31%. For similar recognition tasks, the IntrovoiceTM system was used to evaluate the performance of the prototype system resulting in a peak recognition rate of 60% and 18% for speaker 1 and 2 respectively. XNTRODUCI'ION There is a practical need for voice input communication aids that can reliably recognize deaf speech in real time [l]. Such aids could serve the communication needs of deaf speakers by converting unintelligible speech into printed displays or synthetic speech for use as a voice input communication system [2). Despite the large variability in deaf speech, listeners who have adjusted to the overall speech production patterns of an individual have few problems in understanding it [3]. Deviations in deaf speech include consonant substitution, vowel neutralization, utterance prolongation, voicing/unvoicing, stressing/unstressing errors etc. These errors do not occur in a random way but may reflect a different type of coding structure in producing speech [4]. Previous studies have shown that it is possible to identify consistent acoustic features to account for the variability in deaf speech [q. Using these features could improve the recognition accuracy. Neural networks have been shown to perform pattern recognition tasks such as speech recognition successfully. There is evidence that time delay neural networks can tolerate variations in the phonemic environment 16). These variations can be related to substitution and prolongation errors commonly occurring in deaf speech. METHODS Two congenitally deaf adult male speakers who had sensorineural hearing loss of 9OdB HL or more in the frequency range 200-8oOo Hz were selected. A vocabulary of twenty words was selected from list F of the Modified Rhyme Test (MRT) test [7]. Each speaker produced each word twenty six times across two recording sessions that were spaced one month apart. Five nonnai hearing listeners participated in the intelligibility testing. The order of listening task was randomized and the replay of speech samples were also randomized. Each listener was asked to select one word from a closed set of six rhyming words. The testing procedure simulated the presence of a familiar listener and had the advantage of eliminating the learning time required by other test schemes. The percentage of words correctly identified by each listener was calculated as the in","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"33 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":"115933581","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}

{"title":"Designing proteins to transfer electrons","authors":"J. Regan, J. Onuchic","doi":"10.1109/IEMBS.1993.979267","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.979267","url":null,"abstract":"The ability to design electron transfer (ET) proteins that can emulate the properties of biological systems will help to answer questions in biology, but should also help to answer questions in the areas of energy conversion, catalysis, and molecular electronics. A quantum mechanical model is presented for ET reactions, which both successfully predicts relative ET rates, and suggests a simple design paradigm for developing artificial molecules capable of ET.","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"51 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":"131950723","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}

{"title":"Wavelet analysis of the multiple single unit recordings in the optic tectum of the frog","authors":"Y. Akay, E. Micheli-Tzanakou","doi":"10.1109/IEMBS.1993.978572","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978572","url":null,"abstract":"In this study, multiple single unit recordings taken from the superficial optic tectum of the frog were analyzed for classification of spike trains using the parametric modeling method and the wavelet transform method. Results showed that each spike train hae unique characteristics in the time-frequency domain that identifying individual spike characteristics.","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"36 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":"132230269","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}

{"title":"Clinical considerations in the analysis of mammographic images by computer","authors":"C. J. Vybomy","doi":"10.1109/IEMBS.1993.978420","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978420","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":"129995248","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}

{"title":"Ultrasonically focused neuromagnetic stimulation","authors":"J. Edrich, Tongsheng Zhang","doi":"10.1109/IEMBS.1993.979121","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.979121","url":null,"abstract":"Abstract The Interaction of focused ultrasound and magnetlc fields at low irequencles for neuromagnetlc stlmulatlon Is studled. Slmulatlons show that excitation requtres a threshold magnetlc fleld of only about 0.25 tesla for an ultrasound power denslty of 200 watts/cm2. The results indicate that thls new nonlnvaslve type of Functlonal Neuromuscular Stlmulatlon (FNS) mlght cllnlcally be useful when hlgh spatlal resolutlon Is requlred.","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"55 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":"130055348","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}

{"title":"Spectral analysis of signal averaged electrocardiograms in patients with hypertrophic cardiomyopathy","authors":"Z. Czyz̊, T. Petelenz, Maciej Sosnowski, J. Lesski","doi":"10.1109/IEMBS.1993.978834","DOIUrl":"https://doi.org/10.1109/IEMBS.1993.978834","url":null,"abstract":"","PeriodicalId":408657,"journal":{"name":"Proceedings of the 15th Annual International Conference of the IEEE Engineering in Medicine and Biology Societ","volume":"20 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":"130059751","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}