发布求助
文献互助 智能选刊 最新文献

Proceedings of Computers in Cardiology Conference最新文献

筛选
英文 中文
Biplane coronary angiography: accurate quantitative 3-D reconstruction without isocenter 双翼冠状动脉造影:无等心的精确定量三维重建
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378495
A. Wahle, E. Wellnhofer, H. Oswald, E. Fleck
{"title":"Biplane coronary angiography: accurate quantitative 3-D reconstruction without isocenter","authors":"A. Wahle, E. Wellnhofer, H. Oswald, E. Fleck","doi":"10.1109/CIC.1993.378495","DOIUrl":"https://doi.org/10.1109/CIC.1993.378495","url":null,"abstract":"Exact knowledge on the morphology of coronary vessel systems is of increasing importance for clinical applications. The quantification of morphologic vessel parameters is an essential aid in diagnosis, therapy planning and verification of surgical results. 3-D reconstruction from biplane angiograms is well suited for these purposes. Most of the present reconstruction systems assume a fixed isocenter, which does not reflect the real conditions. Even if the devices were adjusted by special phantoms, the systems may shift during angulation. Mechanical solutions of this problem would be complex and expensive. Handling the diffuse isocenter problem just by a generalized intersection point cannot deliver sufficient results for quantitative evaluations. In the authors' new approach presented here, they dropped the assumption of a stable isocenter and considered the real mechanical properties of biplane imaging systems.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"19 1","pages":"97-100"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88957704","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: 15
A generalized matrix eigensystem approach to the inverse problem of electrocardiography 心电图反问题的广义矩阵特征系统方法
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378444
R. Throne, L. Olson
{"title":"A generalized matrix eigensystem approach to the inverse problem of electrocardiography","authors":"R. Throne, L. Olson","doi":"10.1109/CIC.1993.378444","DOIUrl":"https://doi.org/10.1109/CIC.1993.378444","url":null,"abstract":"The authors present a new approach to the ill-conditioned inverse problem of electrocardiography which employs finite element techniques to generate a truncated eigenvector expansion which stabilizes the inversion. The body surface potentials are expanded in terms of the eigenvectors, and a least squares fit to the measured body surface potentials is used to determine the coefficients of the expansion. This expansion is then used directly to determine the potentials on the surface of the heart.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"22 1","pages":"301-303"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81585708","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
Compensated simulated annealing vs. dynamic programming used for boundary detection in intracoronary ultrasound 补偿模拟退火与动态规划用于冠状动脉内超声的边界检测
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378491
T. Johnson, W. Snyder, D. Herrington
{"title":"Compensated simulated annealing vs. dynamic programming used for boundary detection in intracoronary ultrasound","authors":"T. Johnson, W. Snyder, D. Herrington","doi":"10.1109/CIC.1993.378491","DOIUrl":"https://doi.org/10.1109/CIC.1993.378491","url":null,"abstract":"Intracoronary ultrasound (ICUS) is a valuable tool in the study of coronary artery disease. Accurate and robust methods using real-time automated boundary detection algorithms are needed to quantify lumen and intimal-medial areas. The authors' approach transforms ICUS boundary detection into a recirculant multilayer graph problem with local minima. Dynamic programming (DP) and simulated annealing (SA) are two fundamentally different approaches to this optimization problem which are known to converge to the global minimum. However, time to convergence for SA is impractical. The authors compare a new optimized implementation of SA called compensated simulated annealing with DP.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"32 1","pages":"113-116"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86175075","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
Use of hidden Marcov models for the analysis of multiple lead ECG recordings 使用隐马尔可夫模型分析多个导联心电图记录
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378294
D. Voudouris, M. Strintzis, N. Maglaveras, C. Pappas
{"title":"Use of hidden Marcov models for the analysis of multiple lead ECG recordings","authors":"D. Voudouris, M. Strintzis, N. Maglaveras, C. Pappas","doi":"10.1109/CIC.1993.378294","DOIUrl":"https://doi.org/10.1109/CIC.1993.378294","url":null,"abstract":"A new hidden Marcov model (HMM) structure with vector-valued observation sequences is developed for the characterization of cardiac arrhythmias and other irregularities in multiple-lead ECG recordings. An analysis procedure is then proposed which generalises the HMM analysis developed for single-lead ECGs.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"24 1","pages":"899-902"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88333462","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
Volume rendering for 3-D echocardiography visualization 三维超声心动图可视化的体绘制
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378467
A. Sarti, C. Lamberti, G. Erbacci, R. Pini
{"title":"Volume rendering for 3-D echocardiography visualization","authors":"A. Sarti, C. Lamberti, G. Erbacci, R. Pini","doi":"10.1109/CIC.1993.378467","DOIUrl":"https://doi.org/10.1109/CIC.1993.378467","url":null,"abstract":"Volume rendering techniques are particularly useful for the visualization of echographic data which appear noisy, irregular and fuzzy. Data were acquired by means of an annular transducer which rotates around its axis with increments of 3.6 degrees allowing the acquisition of 50 ECG-gated 2-D echography images. The 2-D images acquired in polar coordinates were remapped over a cartesian grid to produce a cube of data. A transfer function that allows the mapping of the 3-D echo data into colour and opacity visual parameters to enhance the regions of interest has been considered. A suitable shading algorithm allows the data to be viewed 3-dimensionally by means of a simple illumination technique. The final 2-D image is obtained by means of a back to front ray casting algorithm.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":" 23","pages":"209-212"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91413127","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
Myocardial infarction: diagnosis and vital status prediction using neural networks 心肌梗死:神经网络诊断与生命状态预测
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378462
E. Micheli-Tzanakou, C. Yi, W. Kostis, D. Shindler, J. Kostis
{"title":"Myocardial infarction: diagnosis and vital status prediction using neural networks","authors":"E. Micheli-Tzanakou, C. Yi, W. Kostis, D. Shindler, J. Kostis","doi":"10.1109/CIC.1993.378462","DOIUrl":"https://doi.org/10.1109/CIC.1993.378462","url":null,"abstract":"Neural networks (NNs) have been found useful in many biomedical applications. The authors' purpose is to apply NNs to two specific problems in cardiology, namely, diagnosis of echocardiograms for myocardial infarction and prediction of vital status of patients that suffered such. The authors used NNs to discriminate between normal and infarcted myocardium, by looking at intensity changes. The intensities of selected regions are used for training and testing. In predicting the vital status of patients that have suffered acute myocardial infarction, the authors used a large database (MIDAS) with follow-ups. The NN in this case has two hidden layers with 18 patient variables from the MIDAS dataset as inputs. The NN was again trained with the feedback algorithm ALOPEX and tested with unknown data.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"21 1","pages":"229-232"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87320659","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: 8
Nonstationary ECG analysis using Wigner-Ville transform and wavelets 基于Wigner-Ville变换和小波的非平稳心电分析
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378394
P. Kotsas, C. Pappas, M. Strintzis, N. Maglaveras
{"title":"Nonstationary ECG analysis using Wigner-Ville transform and wavelets","authors":"P. Kotsas, C. Pappas, M. Strintzis, N. Maglaveras","doi":"10.1109/CIC.1993.378394","DOIUrl":"https://doi.org/10.1109/CIC.1993.378394","url":null,"abstract":"Nonstationary analysis of ECGs (especially the ST segment) was performed using the Wigner-Ville distribution (WVD) and wavelet transforms. The analysis was done on multiple leads of the same subject and on subjects with normal ECG, ischemia, necrosis and infarct. All data came from the CSE multilead database. It was found that the spectrotemporal maps were not considerably different from lead to lead and that substantial changes in spectrotemporal maps concerning the existence of nonstationarities exist among the above-mentioned pathological states. These changes were evident mainly in the QRS complex and the ST segment. Only in the infarcted subject did such changes persist over the whole P-QRS-T complex. The WVD was found superior from the wavelet transform in having better time- and frequency-domain resolution and superior computational performance.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"1 1","pages":"499-502"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90662871","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: 8
Quantification of fragmented ventricular depolarizations over the entire QRS complex for improving the identification of patients with ventricular tachycardia 量化整个QRS复合体的碎片性心室去极化，以提高室性心动过速患者的识别
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378502
D. Olinic, F. Trémel, P. Defaye, N. Olinic, S. Nedevschi, R. Vlaicu, B. Denis
{"title":"Quantification of fragmented ventricular depolarizations over the entire QRS complex for improving the identification of patients with ventricular tachycardia","authors":"D. Olinic, F. Trémel, P. Defaye, N. Olinic, S. Nedevschi, R. Vlaicu, B. Denis","doi":"10.1109/CIC.1993.378502","DOIUrl":"https://doi.org/10.1109/CIC.1993.378502","url":null,"abstract":"Fragmented ventricular depolarizations (FVD) were assumed to be recorded as low amplitude deflections (5-100 /spl mu/V) on the high resolution recordings of averaged unfiltered electrocardiograms. Scores that quantify FVD over the entire QRS complex and, respectively, in the terminal part of the QRS complex, in all the three X, Y and Z leads, were defined. In 55 patients with ventricular tachycardia, the detection of late potentials (at 40 Hz) was significantly related to the duration of the QRS complex and to the Score and duration of FVD in the terminal QRS complex. As compared to late potentials detection, a FVD Score >3 over the entire QRS complex, and not only a FVD Score >2 in the terminal QRS, significantly improved the identification of VT patients, without increasing the prevalence of false positive results in the control groups of hypertensive patients and of subjects without cardiopathy.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"12 1","pages":"69-72"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91217568","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
Increase of respiratory sinus arrhythmia after administration of diltiazem despite reduction of blood pressure 使用地尔硫卓后呼吸性窦性心律失常增加，尽管血压降低
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378441
A. Frey, C. Muller, M. Dambacher, K. Theisen
{"title":"Increase of respiratory sinus arrhythmia after administration of diltiazem despite reduction of blood pressure","authors":"A. Frey, C. Muller, M. Dambacher, K. Theisen","doi":"10.1109/CIC.1993.378441","DOIUrl":"https://doi.org/10.1109/CIC.1993.378441","url":null,"abstract":"Power spectral analysis of heart rate variability was used to study the effects of the calcium channel blocker diltiazem and the /spl beta/-receptor blocker metoprolol on the parasympathetic nervous system. The area under the curve of the high frequency range (f=0.18-0.35 Hz) during controlled respiratory frequency (f=0.25 Hz) was used as a quantitative probe of parasympathetic activity. 24 male patients with proven coronary heart disease and normal left ventricular function (LVEF>60%), mean age 60/spl plusmn/9 years, were studied 2 weeks after chronic treatment with diltiazem (3/spl times/60 mg) or metoprolol (3/spl times/60 mg). 12 patients received diltiazem, 12 patients received metoprolol. After acute administration of diltiazem blood pressure was reduced but parasympathetic activity was significantly higher as compared with the initial measurement. The same effect was seen for metoprolol where a significant lower heart rate was present after acute administration of the drug. The relative enhancement of the vagal influence on heart rate may contribute to the beneficial effects of both drugs in patients with coronary heart disease.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"10 1","pages":"313-316"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73358444","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
Improving the quality of heart rate variability spectra by imposing a constraint on the amount of ectopy in each data segment 通过对每个数据段的异位量施加约束，提高心率变异性谱的质量
Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378381
J.J. Chungath, A. Ramanathan, M. Kienzle, G. Myers
{"title":"Improving the quality of heart rate variability spectra by imposing a constraint on the amount of ectopy in each data segment","authors":"J.J. Chungath, A. Ramanathan, M. Kienzle, G. Myers","doi":"10.1109/CIC.1993.378381","DOIUrl":"https://doi.org/10.1109/CIC.1993.378381","url":null,"abstract":"Heart rate variability (HRV) is primarily due to instability oscillations of homeostatic feedback loops. Each loop tends to oscillate at a frequency characteristic of the time required to traverse that loop. Discarding all segments with ectopy is impractical in a clinical setting, since the number of ectopy-free segments is low even in patients with moderate ectopy. Investigators are extending spectra into lower frequency ranges, which requires longer data segments, and further reduces the number of ectopy-free segments. A method is proposed to determine the level of ectopy above which data segments should be discarded. By enforcing an effective ectopy cutoff, the mean distance among the spectra making up the average periodogram is reduced, increasing the confidence in these spectra. This technique allows for \"quality control\" of the data upon which HRV spectral analysis is based.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"22 1","pages":"727-729"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72985717","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
首页 上一页 下一页 尾页
0
×
引用
GB/T 7714-2015
复制
MLA
复制
APA
复制
导出至
BibTeX EndNote RefMan NoteFirst NoteExpress
×
提示
您的信息不完整，为了账户安全，请先补充。
现在去补充
×
提示
您因"违规操作"
具体请查看互助需知
我知道了
×
提示
现在去查看 取消
×
提示
确定
请完成安全验证×
相关产品
×
本文献相关产品
联系我们：info@booksci.cn Book学术提供免费学术资源搜索服务，方便国内外学者检索中英文文献。致力于提供最便捷和优质的服务体验。 Copyright © 2023 布克学术 All rights reserved.
京ICP备2023020795号-1
ghs 京公网安备 11010802042870号
Book学术文献互助
Book学术文献互助群
群 号：604180095
Book学术官方微信