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[1989] Proceedings. Computers in Cardiology最新文献

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Body surface potential maps classification by center of mass loci 体表电位图按质心轨迹分类
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130518
D. Adam, S. Gilat, S. Sideman
{"title":"Body surface potential maps classification by center of mass loci","authors":"D. Adam, S. Gilat, S. Sideman","doi":"10.1109/CIC.1989.130518","DOIUrl":"https://doi.org/10.1109/CIC.1989.130518","url":null,"abstract":"Body surface-potential mapping (BSPM) is used to improve the spatial resolution of measurements of bioelectrical information originating from myocardial sources. Here, a method for data compression is used to define a quantitative parameter which is further used for classification. A sequence of annuli is created from the maps by data compression. A second step extracts the center of mass of each annulus to create a locus assumed to represent the activation process. The Fisher linear discriminant is then used to discriminate between maps which reflect normal and abnormal activity of the heart. Data are recorded over a single heart beat from 25 normal subjects, 17 patients with CAD (coronary artery disease), and 11 patients with WPW (Wolff-Parkinson-White) syndrome. The loci of the centers of mass in 3-D space have been found to be similar within each category and different among the categories. This parameter has successfully categorized 100% of the WPW patients, 94.2% of the CAD diseases, and 80% of the normal subjects. Thus, the parameter extracted from the annuli has been found to be valuable for separation among the various groups.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125175016","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
Quantitative shape analysis of left ventricular cine-CT images 左心室ct影像的定量形状分析
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130490
E. Dove, K. Philip, D. McPherson, W. Stanford, K. Chandran
{"title":"Quantitative shape analysis of left ventricular cine-CT images","authors":"E. Dove, K. Philip, D. McPherson, W. Stanford, K. Chandran","doi":"10.1109/CIC.1989.130490","DOIUrl":"https://doi.org/10.1109/CIC.1989.130490","url":null,"abstract":"The shape of the endocardial and epicardial borders of excised dog hearts digitized and traced from cine-CT (computer tomography) images have been quantitatively compared with those obtained from actual dissected cross sections digitized and traced with a video camera. Results from a standard Fourier analysis have been compared with those obtained from the proposed boundary matching descriptor method. Both measures indicate that the LV (left ventricle) shape is not altered by the proposed reconstruction procedure. The Fourier analysis indicates that the epicardial borders are more accurately reproduced than the endocardial borders (p<0.05). Results from the introduced technique show that there is no difference in accuracy between the two borders. Reasons are offered for this disparity. The new shape descriptor allows the identification of specific regions in the borders where the shapes do not match. On the basis of these data, the shape of the LV images from cine-CT closely agree with the shape of the actual cross sections obtained by dissection. Errors in shape reproduction appear to be random and not systematic.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130015256","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
The effect of changes in blood volume on low frequency blood pressure fluctuations in spontaneously hypertensive rats 血容量变化对自发性高血压大鼠低频血压波动的影响
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130481
O. Oz, S. Eliash, S. Cohen, S. Akselrod
{"title":"The effect of changes in blood volume on low frequency blood pressure fluctuations in spontaneously hypertensive rats","authors":"O. Oz, S. Eliash, S. Cohen, S. Akselrod","doi":"10.1109/CIC.1989.130481","DOIUrl":"https://doi.org/10.1109/CIC.1989.130481","url":null,"abstract":"This study is based on the hypothesis that the development of essential hypertension is due to a defect in cardiovascular control. Young, prehypertensive, spontaneously hypertensive (SHR) rats were compared with normotensive Wistar Kyoto (WKY) rats. Spectral analysis of blood pressure (ABP) fluctuations previously demonstrated that baseline low-frequency fluctuations (0.04-0.1 Hz) are reduced in the SHR rats even before they develop hypertension. In the present study, 20-min-long ABP traces were sampled with the focus on frequencies as low as 0.004 Hz. The effect caused by a perturbation in blood pressure was investigated in young SHR versus WKY rats. A sudden drop in blood volume (2-ml bleeding) caused a clear increase in low-frequency ABP fluctuations, more pronounced in SHR than in WKY rats. The decrease in mean ABP was larger in SHR (-42%) than in WKY rats (-21%). Alpha/sub 1/-blockade (prazosin) affected the reaction of both species to bleeding differently. The results indicate that the SHR rats exhibit an abnormal nervous response ( alpha -sympathetic) to a drop in blood pressure, which might be at the basis of the development of hypertension.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130272029","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: 5
A system for the measurement of drop volume of intravenous solutions 一种测量静脉溶液滴量的系统
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130579
R. Leor, B. Rabinowitz, E. Kaplinsky
{"title":"A system for the measurement of drop volume of intravenous solutions","authors":"R. Leor, B. Rabinowitz, E. Kaplinsky","doi":"10.1109/CIC.1989.130579","DOIUrl":"https://doi.org/10.1109/CIC.1989.130579","url":null,"abstract":"The accuracy of drug delivery by drop-counting infusion pumps depends among other considerations, on the assumption that drop volume is constant. This assumption may hold true in most cases, except for surface active agents. Lowering the surface tension causes drop size reduction and a decrease in actual drug flow when delivered by drop-counting infusion pumps. To determine the number of drops per milliliter of intravenous solutions, a system comprising an infusion set connected to the bottom of a vertically mounted 5-ml graduated pipette has been developed. A device containing a light source and a photoelectric cell was interfaced to an Atari 104ST microcomputer by means of an analog-to-digital converter and then attached to the filter of the infusion set. An assembler routine detected the falling drops and a main BASIC program calculated the cumulative number of drops and the instantaneous drop rate. Preliminary experience showed that this surface tension lowering effect may account for decreases of up to about 25% in drug delivery when drop-counting infusion pumps are used and thus may have practical clinical consequences.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124990521","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: 4
Factor analysis model of left ventricular function based on Doppler echocardiographic data 基于多普勒超声心动图数据的左心室功能因子分析模型
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130563
F. Szaboki, S. Khoor, E. Kékes
{"title":"Factor analysis model of left ventricular function based on Doppler echocardiographic data","authors":"F. Szaboki, S. Khoor, E. Kékes","doi":"10.1109/CIC.1989.130563","DOIUrl":"https://doi.org/10.1109/CIC.1989.130563","url":null,"abstract":"The left ventricular (LV) systolic and diastolic function was examined by using Doppler echocardiographic data on 108 normal patients. A factor analysis model has been developed to explain the LV functions. 3-3 systolic and diastolic factors were determined by using a factor extraction process from nine systolic and ten diastolic parameters. The first systolic factor correlates to the acceleration, the second to the deceleration, and the third to the PEP/LVET (pre-ejection period/LV ejection time). The first diastolic factor is associated with the early and late filling rate and the isovolumic relaxation period, the second with the late and the third with the early diastolic parameters. On the basis of a determination of the factor scores using the Harman regression method the discriminative values of the factors were analyzed in various heart diseases. An IBM SPSS/PC V3.0 named 'Factor' was used for the factor analysis.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116499234","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
High frequency ECG-a new method to examine depolarization changes mediated by transient myocardial ischemia 高频心电图——一种检测短暂性心肌缺血后去极化变化的新方法
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130494
S. Abboud
{"title":"High frequency ECG-a new method to examine depolarization changes mediated by transient myocardial ischemia","authors":"S. Abboud","doi":"10.1109/CIC.1989.130494","DOIUrl":"https://doi.org/10.1109/CIC.1989.130494","url":null,"abstract":"The very-high-frequency components (150-250 Hz) of the electrocardiogram were evaluated. Experiments were designed to determine the extent to which the morphology of the high-frequency QRS potentials is affected by transient myocardial ischemia. The high-frequency ECG was studied in dogs during induced ischemia and in patients undergoing angioplasty. It was found that the high-frequency ECG appears to detect evidence of transient ischemia with greater sensitivity than visual inspection of the surface ECG and may therefore provide useful information. A finite-element three-dimensional model with a self-similar (fractal) conduction system was introduced as a bridge to the understanding of these electrocardiographic phenomena. By using this model it was found that the morphological changes in the high-frequency QRS can be attributed to a slowing of conduction velocity in the region of ischemia.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127058815","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: 12
An on-line system for the quantitative analysis of coronary arterial segments 冠状动脉段定量分析的在线系统
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130509
P. V. D. Zwet, C. D. V. Land, G. Loois, J. J. Gerbrands, J. Reiber
{"title":"An on-line system for the quantitative analysis of coronary arterial segments","authors":"P. V. D. Zwet, C. D. V. Land, G. Loois, J. J. Gerbrands, J. Reiber","doi":"10.1109/CIC.1989.130509","DOIUrl":"https://doi.org/10.1109/CIC.1989.130509","url":null,"abstract":"The online quantification of coronary arteries is important for the objective and accurate assessment of the effects of coronary intervention procedures. The basic principles of a quantitative coronary arteriography (QCA) software package, to be implemented on the Philips DCI system, is described. First, a centerline of the selected arterial segment is defined. After the beginning and endpoints are manually defined, a modified beam algorithm (MBA) is used to automatically find a path line of this segment. With this path line as a first model, the arterial contours are detected automatically on the basis of the minimum-cost contour detection technique. For accurate results, the image is magnified by a factor of 2 by linear interpolation, and the minimum cost technique is used again, now employing the initially found contours as a model. On the basis of these final contours, a number of relevant clinical parameters are calculated. The QCA software package will be undergoing extensive evaluation studies; the MBA technique has been shown to be very reliable (success score 89.3%).<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"466 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127543131","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: 48
AENEAS: a standard for ECG-management and exchange in the Netherlands AENEAS:荷兰的心电图管理和交换标准
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130546
J. de Bie, G. van Herpen, G. Meester, F. Meijler, C. Zeelenberg
{"title":"AENEAS: a standard for ECG-management and exchange in the Netherlands","authors":"J. de Bie, G. van Herpen, G. Meester, F. Meijler, C. Zeelenberg","doi":"10.1109/CIC.1989.130546","DOIUrl":"https://doi.org/10.1109/CIC.1989.130546","url":null,"abstract":"The Interuniversity Cardiology Institute of the Netherlands (ICIN) has set up a computer network for the exchange of ECG (electrocardiographic) data within nine large Dutch hospitals. The main goal of the project is to be able to share ECGs for both patient care and scientific research. An additional goal is standardization of ECG management and diagnostic statements. A committee was formed to investigate the proposal. It called itself and the proposed network AENEAS, which is an acronym or 'automatic ECG-Analysis in the Netherlands, towards an Exclusive Authorized Standard'. Minimal requirements have been defined for electrocardiographs and management systems, and global network specifications have been written. During the course of the investigation, several types of electrocardiographs and ECG management systems were tested. It became clear that minimal standards still need to be defined for these as well. Communication between electrocardiographs and/or systems is not at all standardized and is virtually impossible between equipment of different vendors.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"76 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127448659","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
Automated analysis of coronary lesions from cineangiograms using vessel tracking and iterative deconvolution techniques 利用血管跟踪和迭代反卷积技术自动分析电影血管造影中的冠状动脉病变
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130508
N. Alperin, K. Hoffmann, K. Doi, K. Chua
{"title":"Automated analysis of coronary lesions from cineangiograms using vessel tracking and iterative deconvolution techniques","authors":"N. Alperin, K. Hoffmann, K. Doi, K. Chua","doi":"10.1109/CIC.1989.130508","DOIUrl":"https://doi.org/10.1109/CIC.1989.130508","url":null,"abstract":"An integrated approach to automated analysis of coronary lesions from cineangiograms is being developed. A vessel segment between two selected endpoints is tracked with a sector-search method. Tracking points in the vessel are located by examination of the pixel values along a box perimeter over a limited range defined by an angular sector which is oriented toward one of the endpoints. Tracked points are fitted by a polynomial curve that yields a smooth vessel centerline, which is used for generation of a straightened vessel image. The image is then corrected for the nonuniform background in the cine image, which is estimated by a two-dimensional fit of the region surrounding the vessel. For each line in the corrected image, the vessel size is determined by the iterative deconvolution technique, which takes into account the line-spread function of the imaging system. With this integrated approach, stenotic lesions can be assessed accurately, even in the presence of complicated vascular anatomy, such as bifurcations, branches, or overlapping vascular structures.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129105686","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: 18
Global and regional wall motion analysis in the right ventricular free wall using digital angiography 数字血管造影术分析右心室游离壁的整体和局部壁运动
[1989] Proceedings. Computers in Cardiology Pub Date : 1989-09-19 DOI: 10.1109/CIC.1989.130583
C. van Eyll, J. Raigoso, J. Etienne, H. Van Mechelen, M. Rousseau, A. Charlier, H. Pouleur
{"title":"Global and regional wall motion analysis in the right ventricular free wall using digital angiography","authors":"C. van Eyll, J. Raigoso, J. Etienne, H. Van Mechelen, M. Rousseau, A. Charlier, H. Pouleur","doi":"10.1109/CIC.1989.130583","DOIUrl":"https://doi.org/10.1109/CIC.1989.130583","url":null,"abstract":"A procedure used to evaluate the right ventricular function parameters during cardiac catheterization is described. The complete processing of right ventricular free-wall geometry and simultaneous pressure recordings is presented. The procedure to quantify regional wall motion in the right ventricular free wall is also emphasized. A quantitative assessment of the right ventricular free-wall function can be easily performed by using the proposed technique during routine diagnostic cardiac procedures. Furthermore, as the procedure only requires a right-sided catheterization, it can also be repeated in outpatients for serial investigations. When compared with similar analyses with radionuclide techniques, this approach offers the advantage of a superior geometric resolution and the benefit of simultaneous high-fidelity pressure recording.<<ETX>>","PeriodicalId":161494,"journal":{"name":"[1989] Proceedings. Computers in Cardiology","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-09-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134452331","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
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