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Proceedings of Computers in Cardiology Conference最新文献

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Effect of spatial orientation on the image-intensifier distortion in quantitative coronary angiography 空间取向对定量冠状动脉造影图像增强器畸变的影响
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378332
E. Gronenschild
{"title":"Effect of spatial orientation on the image-intensifier distortion in quantitative coronary angiography","authors":"E. Gronenschild","doi":"10.1109/CIC.1993.378332","DOIUrl":"https://doi.org/10.1109/CIC.1993.378332","url":null,"abstract":"The effect of spatial orientation of the X-ray gantry on the geometric image distortion caused by the image intensifier (II) is assessed. Variations in absolute positions up to 0.6 mm (14 cm II size), 1.1 mm (17 cm), and 2.8 mm (27 cm) are found for the used Hicor X-ray system. The pixel size varies up to 0.8% (14 cm), 1.1% (17 cm), and 2.3% (27 cm). It is concluded that for accurate quantitative coronary angiography and 3D reconstructions it is necessary to measure the distortion and to correct for it at each of the used orientations.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"56 1","pages":"595-598"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83924701","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}
引用次数: 9
Measurement of organ blood flow with coloured microspheres: a first time-saving improvement using automated spectrophotometry 用有色微球测量器官血流:首次使用自动分光光度法节省时间
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378308
W. Wieland, P. Wouters, H. Van Aken, W. Flameng
{"title":"Measurement of organ blood flow with coloured microspheres: a first time-saving improvement using automated spectrophotometry","authors":"W. Wieland, P. Wouters, H. Van Aken, W. Flameng","doi":"10.1109/CIC.1993.378308","DOIUrl":"https://doi.org/10.1109/CIC.1993.378308","url":null,"abstract":"The authors report on the development and application of automated spectrophotometry for regional blood flow measurement using the coloured microsphere (CM) dye-extraction technique. A software program running under Microsoft Windows 3.1 was written to simultaneously control an autosampler, sipper pump, pressure valves and spectrophotometer with an exclusively designed small-volume flow-cell. The system allowed consecutive measurements of over 200 tissue samples in volumes as small as 40 /spl mu/L without any attendance. The system was validated in eight chronically instrumented dogs. A comparison between the advanced CM technique and the standard radionuclide microspheres method demonstrated a strong correlation for blood flows to various organs in awake animals. The system proved to be a reliable, user-friendly and time-saving application for the CM dye-extraction technique.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"24 1","pages":"691-694"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82963985","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}
引用次数: 33
Coupled modelling of blood flow and arterial wall interactions by the finite element method 血流与动脉壁相互作用的有限元耦合模拟
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378309
X. Xu, T. Griffith, M. Collins, C.J.H. Jones, Y. Tardy
{"title":"Coupled modelling of blood flow and arterial wall interactions by the finite element method","authors":"X. Xu, T. Griffith, M. Collins, C.J.H. Jones, Y. Tardy","doi":"10.1109/CIC.1993.378309","DOIUrl":"https://doi.org/10.1109/CIC.1993.378309","url":null,"abstract":"A coupled treatment of blood/arterial wall interactions is presented here. The model solves three different types of equations: (1) the full time-dependent Navier-Stokes equations governing the flow of blood, (2) the linear-elastic small-displacement stress equations for the arterial wall, and (3) the mesh displacement equations. These equations are discretised using the Galerkin finite element method. The coupled model is able to predict the time-dependent displacement and stress fields within the solid wall, as well as the full flow field. To demonstrate the validity of the approach, a number of sample calculations have been performed showing good agreement with available analytical solutions. The model is then applied to physiologically realistic arterial flow situations.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"88 1","pages":"687-690"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83840497","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}
引用次数: 2
Estimation of left ventricular filling gradients using digital analysis of color Doppler M-mode velocities 利用彩色多普勒m型速度的数字分析估计左心室充盈梯度
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378446
P. Vandervoort, N. Greenberg, P. McCarthy, J.D. Thomas
{"title":"Estimation of left ventricular filling gradients using digital analysis of color Doppler M-mode velocities","authors":"P. Vandervoort, N. Greenberg, P. McCarthy, J.D. Thomas","doi":"10.1109/CIC.1993.378446","DOIUrl":"https://doi.org/10.1109/CIC.1993.378446","url":null,"abstract":"The assessment of diastolic function currently requires the measurement of intracardiac pressures. Although characteristic pulsed Doppler velocity spectra have been described for a few cardiac diseases, it is only an indirect measure of diastolic function. Color Doppler M-mode measurements of blood passing from the atrium to the ventricle may allow one to investigate global (transmitral) and local (intraventricular) pressure gradients, associated with ventricular relaxation. In the study reported the authors investigate the feasibility and the accuracy of calculating transmitral filling gradients from color Doppler M-mode velocities.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"41 1","pages":"293-296"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83212026","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}
引用次数: 2
Optimizing edge detection in quantitative coronary arteriography: problems and proposals 优化定量冠状动脉造影边缘检测:问题与建议
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378335
W. Wunderlich, T. Linderer, B. Backs, F. Fischer, J. Noering, R. Schroeder
{"title":"Optimizing edge detection in quantitative coronary arteriography: problems and proposals","authors":"W. Wunderlich, T. Linderer, B. Backs, F. Fischer, J. Noering, R. Schroeder","doi":"10.1109/CIC.1993.378335","DOIUrl":"https://doi.org/10.1109/CIC.1993.378335","url":null,"abstract":"Optimum geometric edge detection in quantitative coronary arteriography (QCA) is determined by the accuracy of measurements of known phantom diameters. The authors optimized the edge detection for different calibration methods, diameter ranges, accuracy measures and performance strategies. They found, that the optimization process itself is ill-defined, depending on the calibration method used, the included range of small diameters and the accuracy measure. For detectability of diameter changes accuracy-optimized edge detection is inferior to precision-optimum approach. The optimization of both, accuracy and precision can only be achieved with a precision-optimum approach and diameter correction.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"1 1","pages":"583-586"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83326539","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}
引用次数: 7
Expert derived automatically generated classification trees: an example from pediatric cardiology 专家自动生成的分类树:一个来自儿科心脏病学的例子
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378465
C. Bull, M. Chiogna, R. Franklin, D. Spiegelhalter
{"title":"Expert derived automatically generated classification trees: an example from pediatric cardiology","authors":"C. Bull, M. Chiogna, R. Franklin, D. Spiegelhalter","doi":"10.1109/CIC.1993.378465","DOIUrl":"https://doi.org/10.1109/CIC.1993.378465","url":null,"abstract":"Classification trees provide an attractively transparent discrimination technique and may be derived either from expert opinion or from data analysis. The authors considered a real and complex problem concerning the diagnosis of babies with suspected congenital heart disease into one of 27 classes. A full loss matrix for all possible misclassifications was obtained from clinical assessments. A tree derived from expert opinion was compared with trees derived from analysis of 571 past cases both for the full problem and for a subset of 6 diseases. Automatic methods for tree creation had problems with rare diseases. Inclusion of 'costs of misclassification' feedback on the training dataset improved the performance of data derived trees though they were generally outperformed by the expert tree.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"34 1","pages":"217-220"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90696172","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}
引用次数: 3
A new method for reducing signal-overlapping noise in standard electrocardiogram 一种降低标准心电图信号重叠噪声的新方法
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378365
D. Wei, E. Harasawa, H. Harada, H. Hosaka
{"title":"A new method for reducing signal-overlapping noise in standard electrocardiogram","authors":"D. Wei, E. Harasawa, H. Harada, H. Hosaka","doi":"10.1109/CIC.1993.378365","DOIUrl":"https://doi.org/10.1109/CIC.1993.378365","url":null,"abstract":"A new method is developed for reducing signal-overlapping noise in the standard electrocardiogram, which has so far been difficult with a traditional filter based on the frequency method. The new method, called signal decomposition method, first separates the input signal into a noise-free part and a noise-overlapping part with a zero-phase low-pass filter. It then restores the signal components from the noise-overlapping part and adds the signal components to the noise-free part so as to eliminate distortion of the original signal. An experimental study with clinical ECG data shows that this method is very effective in reducing signal-overlapping noise and power interference, with little signal distortion.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"48 1","pages":"795-798"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90116627","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}
引用次数: 1
Influence of initial resistance on gain of short-term systemic autoregulation 初始阻力对短期系统自调节增益的影响
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378314
R. Burattini, P. Borgdorff, N. Westerhof
{"title":"Influence of initial resistance on gain of short-term systemic autoregulation","authors":"R. Burattini, P. Borgdorff, N. Westerhof","doi":"10.1109/CIC.1993.378314","DOIUrl":"https://doi.org/10.1109/CIC.1993.378314","url":null,"abstract":"The relationship between strength of short-term whole body autoregulation and peripheral resistance in the reference state (initial resistance) was investigated in dogs (n=9) and cats (n=18) after abolishing baroreflex activity. Aortic and venous pressure and aortic flow the authors remeasured in the reference state and one to three minutes after partial vena cava occlusions. After cardiac output and peripheral resistance were normalised for body weight, autoregulation resistance gain (G/sub ra/) was estimated from the experimental data. The relationship between values of G/sub ra/ and the corresponding values of initial resistance was approximated by a straight line (r=0.9) with positive slope. This result indicates that the higher the resistance in the reference state, the stronger autoregulation will be.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"28 1","pages":"667-669"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75892603","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}
引用次数: 0
Probability of ventricular arrhythmias following stereotyped short-long sequences: a computerized analysis of digitized dynamic ECG recordings 室性心律失常的概率遵循刻板的短-长序列:数字化动态心电图记录的计算机分析
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378345
E. Locati-Heilbron, P. Maison-Blanche, F. Bozza, P. Dejode, P. Coumel
{"title":"Probability of ventricular arrhythmias following stereotyped short-long sequences: a computerized analysis of digitized dynamic ECG recordings","authors":"E. Locati-Heilbron, P. Maison-Blanche, F. Bozza, P. Dejode, P. Coumel","doi":"10.1109/CIC.1993.378345","DOIUrl":"https://doi.org/10.1109/CIC.1993.378345","url":null,"abstract":"Stereotyped \"short-long\" templates have been described to precede the spontaneous onset of ventricular arrhythmias. Individual \"short-long\" cycle length sequences can be modelized and implemented to digitized Holter recordings, in order to detect how often a specific template is followed by ventricular arrhythmias. Thus, the probability of individual \"short-long\" templates to be followed by ventricular arrhythmias can be computed. Therefore, the quantitative scanning of digitized Holter recordings for individual-specific cycle length sequences can be viewed as new \"non-invasive electrophysiologic test\" exploring the individual cycle length determinants of ventricular arrhythmias.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"17 1","pages":"883-886"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73939695","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}
引用次数: 2
Finite element modeling of atherosclerotic plaque 动脉粥样硬化斑块的有限元建模
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378366
A. Veress, J. Cornhill, Kimerly A. Powell, E. E. Herderick, James D. Thomas
{"title":"Finite element modeling of atherosclerotic plaque","authors":"A. Veress, J. Cornhill, Kimerly A. Powell, E. E. Herderick, James D. Thomas","doi":"10.1109/CIC.1993.378366","DOIUrl":"https://doi.org/10.1109/CIC.1993.378366","url":null,"abstract":"2-D mathematical models of the coronary walls have been developed based on actual plaque morphology from a multi-center study of coronary disease (Pathological Determinants of Atherosclerosis in Youths, PDAY). The probability of lipid maps were used to define a typical lesion's physical dimensions for four age ranges. Under physiological loading from intra-arterial pressure, the resulting intramural stress distributions were quantified as a function of patient age. The area of highest stress in the 15-19 year group was shifted from the healthy wall opposite the lesion to the area where the normal intima is adjacent to the plaque cap and increased with age. The age related development of atherosclerosis leads to a predictable increase in localized wall stress, which may predispose a plaque to rupture.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"37 1","pages":"791-794"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84247013","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}
引用次数: 7
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