Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)最新文献

{"title":"An evaluation of a number of techniques for decreasing the computational complexity of texture feature extraction through an application to ultrasonic image analysis","authors":"A.E. Svolos, A. Pokropek","doi":"10.1109/IEMBS.1997.757682","DOIUrl":"https://doi.org/10.1109/IEMBS.1997.757682","url":null,"abstract":"Texture feature extraction has been proved to be a fundamental process in medical image analysis. Therefore, the reduction of its computational time and storage requirements should be an aim of continuous research. This paper investigates a number of techniques in the direction of the above goal. They are all based on the space efficient co-occurrence trees in the spatial grey level dependence method (SGLDM). The techniques are applied to a number of ultrasonic images, giving lower bound results on their time performance. A comparison with the co-occurrence matrix approach is performed. Finally, their usefulness in a real clinical application is discussed.","PeriodicalId":342750,"journal":{"name":"Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130027873","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":"Visualisation and storage of biological signals in neurophysiology laboratory","authors":"O. Pacheco, R. Conceição, F. Trancho, A. Tomé","doi":"10.1109/IEMBS.1997.757018","DOIUrl":"https://doi.org/10.1109/IEMBS.1997.757018","url":null,"abstract":"In this paper, we describe an application to visualize biological events, which is particularly suited to neurophysiology environments. The application requirements are based on the polygraphic trace. The application was developed using object-oriented techniques supported by the Borland C++ compiler and its ObjectWindows library and Resource Workshop.","PeriodicalId":342750,"journal":{"name":"Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)","volume":"142 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130031629","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":"Unsupervised 3-D restoration of tomographic images by constrained Wiener filtering","authors":"S. Pereiró, Y. Goussard","doi":"10.1109/IEMBS.1997.757670","DOIUrl":"https://doi.org/10.1109/IEMBS.1997.757670","url":null,"abstract":"This communication presents a non-supervised restoration method based on a constrained Wiener filter. We implement our filter in the spatial domain and perform the filtering in 3-D. Our central contribution lies in the derivation of a cross validation based algorithm which estimates the noise variance from the observed image. Exploitation of the partitioned matrix inversion lemma leads to a reasonable computation time. Results indicate that the method is able to determine the noise variance with an accuracy sufficient to produce acceptable results in the restoration at low signal-to-noise ratios. However at higher signal-to-noise ratios (above 15 dB) some undersmoothing is observed.","PeriodicalId":342750,"journal":{"name":"Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130037403","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":"Discrete wavelet transform applied to heart rate variability analysis in iron-deficient anemic infants","authors":"C. Médigue, J. Bestel, S. Renard, M. Garrido, F. Pizarro, P. Peirano","doi":"10.1109/IEMBS.1997.757024","DOIUrl":"https://doi.org/10.1109/IEMBS.1997.757024","url":null,"abstract":"To assess the autonomic nervous system development in iron-deficient anemic infants during sleep, we applied the discrete wavelet transform to perform heart rate variability analysis. The method provides suitable frequency resolution in the low-frequency domain, which is the domain of physiological interest. Significant differences between iron-deficient and control infants are shown in both quiet and active (REM) sleep, suggesting an autonomic dysfunction or delay in anemic infants.","PeriodicalId":342750,"journal":{"name":"Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130083895","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":"An analysis of systematic errors in the electrical impedance measurement of tissue characteristics during an in-vitro study in the frequency range 1 kHz to 4 MHz","authors":"B. Tunstall, W. Wang, Z. Cheng, M. McCormick, D. Rew","doi":"10.1109/IEMBS.1997.757797","DOIUrl":"https://doi.org/10.1109/IEMBS.1997.757797","url":null,"abstract":"This paper describes some of the important systematic errors associated with an in-vitro study, using a four electrode impedance system, into the characteristics that allow for differentiation between normal and abnormal tissues. The impact of system parameters were investigated though the use of saline-filled phantoms and tissue samples. The latter being provided as part of a 100 patient in-vitro study carried out in collaboration with the Glenfield General Hospital, Leicester, UK. It has been found necessary to provide an environment with a known, and calibrated, post sample excision period. However, the orientation of the tissue during the measurement was also found to have a large and important impact upon the measured impedance.","PeriodicalId":342750,"journal":{"name":"Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130134662","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":"Visualization of radionuclide imaging and activation recovery intervals on the epicardial surface","authors":"E. Penades, W. O'Connell, R. Macleod, M. Dae, M. Lesh","doi":"10.1109/IEMBS.1997.754477","DOIUrl":"https://doi.org/10.1109/IEMBS.1997.754477","url":null,"abstract":"Greater knowledge of the factors influencing ventricular arrhythmias will aid in the identification people who are at risk for cardiac sudden death. The authors investigated whether regional heterogeneity of sympathetic innervation results in heterogeneous distributions of repolarization responses and whether this heterogeneity is a substrate for arrhythmias. The authors found the distribution of myocardial sympathetic nerve endings in autoradiographic images, and they measured repolarization changes by determining activation recovery intervals (ARI) from unipolar electrograms on the surface of the heart. An epicardial surface was extracted from autoradiographic images to display the distribution of innervation, and the activation recovery intervals were mapped onto the epicardial surface.","PeriodicalId":342750,"journal":{"name":"Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134603281","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":"Mapping and radiofrequency ablation of ventricular tachycardia","authors":"A. Greenspon","doi":"10.1109/IEMBS.1997.756872","DOIUrl":"https://doi.org/10.1109/IEMBS.1997.756872","url":null,"abstract":"Radiofrequency catheter ablation has become the nonpharmacologic treatment of choice in patients with a variety of supraventricular arrhythmias. Small discrete lesions are produced by delivering 20-40 W of unmodulated 500 kHz RF energy to the tip of a standard 4 mm electrode catheter. Resistive heating of cardiac tissue occurs at the point of tissue contact. Successful treatment of these arrhythmias may be achieved in greater than 90% of cases. The results of RF catheter ablation for the treatment of ventricular tachycardia (VT) are variable. RF catheter ablation in patients with normal hearts who may have either idiopathic left VT arising from right ventricular outflow tract is highly effective with success rates approaching 100%. These tachycardias usually arise from a small focus and therefore the area required for ablation is small and easy to target. Unfortunately, most patients who have VT have abnormal ventricular function, frequently a previous myocardial infarction. In these patients, the tachycardia circuits may be large and complex. The efficacy rate of RF ablation for VT using current technology is much lower. This presentation will focus on our development of a strategy for successful ablation of VT post myocardial infarction (MI). Accurate analysis of the VT substrate is crucial for successful ablation. A post-MI model of sustained VT was created in swine by injecting agarose gel beads following PTCA balloon occlusion of the LAD coronary artery. Surviving animals returned for programmed electrical stimulation 4-6 weeks later. Stable sustained VT was induced in 35 animals. This VT could be reproducibly initiated and terminated. A multielectrode \"basket\" catheter was percutaneously inserted prior to VT induction to map endocardial electrical activation. The \"basket\" catheter (Constellation, EP Technologies, Sunnyvale, CA) consists of eight self-expanding nitinol struts with 64 symmetrically arranged electrodes. The catheter is capable of both recording and pacing. Using this system we prospectively analyzed the induced VTs in these animals. Bipolar endocardial signals were obtained from the catheter during sinus rhythm and VT. Signals were filtered at 30-500 Hz and recorded multichannel recorder (EP LabSystem, Corp.). Endocardial recordings demonstrated fractionated electrical activity in the zone of infarction during sinus rhythm. Early presystolic activity was recorded during VT as well as middiastolic potentials. Reset of VT was seen in 5 animals. Features of classic entrainment as well as concealed entrainment were demonstrated in 12 animals. These features suggest that the mechanism of VT is endocardial reentry, as in humans. RF ablation was performed by guiding a large-tip ablation catheter to the appropriate \"basket\" electrode by means of a \"homing device\" Successful RF ablation of VT was demonstrated in this model. Computer algorithms for analysis of the zone of slow conduction are being developed. Clinical post-myocardial-inf","PeriodicalId":342750,"journal":{"name":"Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133886224","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":"Estimation of aortic BP waveform from noninvasive radial tonometry; validation of FFT and ARX methods","authors":"C. Hori, K. Itakura, M. Nogawa, M. Shirakabe, I. Kubota, H. Tomoike, S. Takatani","doi":"10.1109/IEMBS.1997.756555","DOIUrl":"https://doi.org/10.1109/IEMBS.1997.756555","url":null,"abstract":"The objective of this research was to develop a method of estimating central aortic pressure (AA) waveform from the noninvasive radial tonometry (TRA) waveform. In order to attain this goal, the Fast Fourier Transform (FFT) and Auto-Regressive eXogenous (ARX) models were used to develop the transfer function (TF) between the AA (input) and TRA (output). The inverse TF was then derived to generate the AA waveform from the TRA waveform. To test the accuracy of the model, the aortic pressure waveform using a Millar catheter tip transducer and noninvasive radial artery waveform using a Colin tonometer were simultaneously obtained in 5 patients who were undergoing cardiac catheterization at Yamagata University. The inverse TF based on the FFT model did not accurately reconstruct the AA waveform. On the contrary, ARX model resulted in accurate estimate of AA with the estimation error of approximately 3% for systolic, diastolic and mean pressure levels. The noninvasive radial tonometry in combination with the ARX model may offer a potential of noninvasive estimation of aortic pressure waveform.","PeriodicalId":342750,"journal":{"name":"Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)","volume":"163 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133939832","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":"Three-dimensional ultrasonic imaging with a fully populated 128/spl times/128 array","authors":"T. White, K. Eriksen, A. Nicoli","doi":"10.1109/IEMBS.1997.757743","DOIUrl":"https://doi.org/10.1109/IEMBS.1997.757743","url":null,"abstract":"Survivability of combat casualties is driven by the ability of military medical personnel to rapidly assess the injury and take action. Prevention of exsanguination due to internal injury is greatly enhanced when diagnosis, triage and appropriate initial care can be delivered within the first hour. Increasing demands for improvements in casualty survivability requires the rapid diagnosis of blunt and penetrating trauma that only portable imaging modalities can provide. Ultrasound is the imaging modality with the greatest promise for portable use due to its low cost, compactness and real-time nature. Ultrasound provides definitive identification of blood pooling and internal organ integrity together with visualization of radiolucent foreign bodies. By creating a patient record that begins in the field, documenting and quantifying internal changes as the injury evolves, improved care can be realized. Lockheed Martin is developing a real-time three-dimensional ultrasound sensor system (3DUSS) to meet this emerging need based on a 128/spl times/128 array. This sensor, when coupled with appropriate PC-based processing and display electronics, forms an imager that is expected to meet the performance goals of: 15 Hz frame rate, 1 mm resolution, and greater than 30 dB of instantaneous dynamic range within a 90 dB total dynamic range.","PeriodicalId":342750,"journal":{"name":"Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)","volume":"270 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133966866","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":"Eye movement auditory biofeedback therapy for nystagmus: past, present and future","authors":"K. Ciuffreda","doi":"10.1109/IEMBS.1997.756903","DOIUrl":"https://doi.org/10.1109/IEMBS.1997.756903","url":null,"abstract":"Nystagmus is a common clinically-observed oculomotor abnormality involving both sensory and motor systems. Over the past several years, methods have been devised to aid in control and treatment of nystagmus, but none have had wide appeal. After-image training, which allows the patient to use visual feedback to monitor changes in eye position and velocity directly and thereby improve fixation ability, has met with moderate success. Orthoptic therapy has improved visual function in some cases. The technique of instructing patients to \"hold the eye steady\" rather than to \"fixate accurately\" while looking at a target has resulted in reduced nystagmus in some patients. Abadi et al. [1980] reported reduction of nystagmus and improvement of contrast sensitivity in three patients after 6 months of home auditory oculomotor biofeedback training. In the present paper, I will review the results of some of our group investigations, as well as individual case studies.","PeriodicalId":342750,"journal":{"name":"Proceedings of the 19th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. 'Magnificent Milestones and Emerging Opportunities in Medical Engineering' (Cat. No.97CH36136)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-10-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134294462","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}