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Computers in Cardiology 1997最新文献

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Volume rendering in medicine: the role of image coherence 医学中的体绘制:图像一致性的作用
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647897
M. Santarelli, V. Positano, L. Landini, A. Benassi
{"title":"Volume rendering in medicine: the role of image coherence","authors":"M. Santarelli, V. Positano, L. Landini, A. Benassi","doi":"10.1109/CIC.1997.647897","DOIUrl":"https://doi.org/10.1109/CIC.1997.647897","url":null,"abstract":"A study is described dealing with the role of image coherence on medical volume rendering algorithm performances. In particular, a simulator has been implemented in order to assess how algorithm performance can be improved by exploiting the amount of coherence for volumetric images. Moreover, typical cardiac images of different imaging modalities, were analysed in order to derive experimental coherence degree and relevant performance optimization indexes.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124272886","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
Angle dependence and reproducibility of cyclic variation of integrated backscatter in normal myocardium 正常心肌后向散射循环变化的角度依赖性和可重复性
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647954
H. Stempfle, U. Buchmeier, C. Werner, K. Theisen, C. Angermann
{"title":"Angle dependence and reproducibility of cyclic variation of integrated backscatter in normal myocardium","authors":"H. Stempfle, U. Buchmeier, C. Werner, K. Theisen, C. Angermann","doi":"10.1109/CIC.1997.647954","DOIUrl":"https://doi.org/10.1109/CIC.1997.647954","url":null,"abstract":"The aim of the study was to assess normal values for cyclic variation of integrated backscatter (CVIB) in different echocardiographic cross sections and myocardial regions and to determine the angle dependence as well as the reproducibility of CVIB. CVIB was measured frame by frame within 23 regions of interest in each of 10 healthy volunteers. Myocardial regions which provided perpendicular orientation of fibers to the ultrasound beam showed high and reproducible values of CVIB. Regions with parallel or oblique fiber orientation appear less suited for CVIB measurements.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"52 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121450098","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
Accurate detection of coronary arteries with the continuous wavelet transform 用连续小波变换精确检测冠状动脉
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648121
A. Munteanu, J. Cornelis, P. De Muynck, Anastasios Bezerianos, P. Cristea
{"title":"Accurate detection of coronary arteries with the continuous wavelet transform","authors":"A. Munteanu, J. Cornelis, P. De Muynck, Anastasios Bezerianos, P. Cristea","doi":"10.1109/CIC.1997.648121","DOIUrl":"https://doi.org/10.1109/CIC.1997.648121","url":null,"abstract":"The authors propose a multi-scale detection scheme of the vessels borders by means of the continuous wavelet transform. The Canny's (1986) performance parameters are derived for Mallat's (1992) wavelet based edge detection operator. The authors take the scale dependent behaviour of these parameters into account to design an algorithm that optimally combines the multiscale information. Evaluation of the algorithm accuracy is obtained on 4 vessel phantoms of different diameters. The authors compare the computer determined diameters to the actual diameters, the correlation coefficient is in the range 0.93-0.99 for different types of wavelets, which proves the ability of the method to accurately detect edges in the presence of noise.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117160086","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: 10
The influence of QRS width on the outcome of heart rate variability QRS宽度对心率变异性结果的影响
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647847
J. Haaksma, J. Brouwer, M. van den Berg, W. Dijk, W. Dassen, G. Mulder, H. Crijns
{"title":"The influence of QRS width on the outcome of heart rate variability","authors":"J. Haaksma, J. Brouwer, M. van den Berg, W. Dijk, W. Dassen, G. Mulder, H. Crijns","doi":"10.1109/CIC.1997.647847","DOIUrl":"https://doi.org/10.1109/CIC.1997.647847","url":null,"abstract":"Analysis of heart rate variability (HRV) is used to assess autonomic control of the heart. Many technical aspects may influence the outcome of the HRV analysis. One of these aspects is the accuracy of onset QRS detection. Inconsistent determination of QRS onset may result in artificial variations, especially in patients with wide QRS complexes. The purpose of the present study was to investigate the effect of QRS width on the outcome of HRV analysis. After manual correction of the onset of QRS: HRV variables averaged over 24 hours showed changes up to 10% in patients with wide QRS complexes. However, comparing single 5 minute segments before and after manual correction of onset QRS, much larger differences were observed. Especially variables reflecting beat to beat changes (time as well as frequency domain) showed substantial differences. The average effect of manual QRS onset correction in single 5 minute segments proved to be 5.3% for rMSSD, 5.2% for high frequency power (0.15-0.40 Hz) and 1.3% for low frequency power (0.04-0.15 Hz). We conclude that accurate detection of QRS onset plays an important role in the outcome of HRV analysis, especially in the analysis of short segments and patients with wide QRS complexes.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123654092","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
Effects on QRS-waveforms and ST-T-segment by changes in body position during continuous 12-lead ECG: a preliminary report 体位变化对连续12导联心电图qrs波形及st - t段影响的初步报道
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647934
T. Jernberg, B. Lindahl, M. Hogberg, L. Wallentin
{"title":"Effects on QRS-waveforms and ST-T-segment by changes in body position during continuous 12-lead ECG: a preliminary report","authors":"T. Jernberg, B. Lindahl, M. Hogberg, L. Wallentin","doi":"10.1109/CIC.1997.647934","DOIUrl":"https://doi.org/10.1109/CIC.1997.647934","url":null,"abstract":"ST-segment monitoring by Holter or by continuous 12-lead ECG-monitoring have prognostic value in unstable angina and myocardial infarction. However, \"pseudo-changes\" due to changes in body position may cause problems during monitoring for indicators of silent ischemia. Therefore, ischemia-monitoring with continuous 12-lead ECG was performed in 36 clinically stable patients in different body positions. Using the ECG in supine position as reference, ST-segment changes were usually small but reached significant levels in some patients, especially in the left lateral decubital position. However these deviations of the ST-segment seemed to arise under certain circumstances, which are possible to recognize in the clinical setting.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128874597","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: 16
Validation of an algorithm for atrial fibrillation and flutter diagnosis 心房颤动与扑动诊断算法的验证
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647940
B. Giraldo, C. Ferre, Pablo Laguna, Raimon Jane, M. Martin, Pere Caminal
{"title":"Validation of an algorithm for atrial fibrillation and flutter diagnosis","authors":"B. Giraldo, C. Ferre, Pablo Laguna, Raimon Jane, M. Martin, Pere Caminal","doi":"10.1109/CIC.1997.647940","DOIUrl":"https://doi.org/10.1109/CIC.1997.647940","url":null,"abstract":"In this work, the authors developed a methodology to evaluate an algorithm (AAFF) for atrial fibrillation (AF) and flutter (AFL) detection and discrimination. Atrial electrical activity in pathologies such as AF and AFL are difficult to characterize quantitatively. The diagnoses provided by AAFF were compared to those established by 8 clinicians at different expertise levels in cardiology, and the MIT-BIH database annotations. The concordance between diagnoses supplied by a pair of experts was studied with the measure of distances between their diagnoses. The methods used to compute distances were: Euclidean distance, Mahalanobis distance and City-block distance. Using the resulting matrices of distances between experts, cluster analyses were carried out to classify AAFF among human experts. The results show that differences between diagnoses made by AAFF and those made by some specialists were smaller than differences between some specialists themselves.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129204948","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
The first order absolute moment in contour tracking 轮廓跟踪中的一阶绝对矩
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647955
M. Paterni, M. Demi, C. Morizzo, M. Kozáková, C. Palombo
{"title":"The first order absolute moment in contour tracking","authors":"M. Paterni, M. Demi, C. Morizzo, M. Kozáková, C. Palombo","doi":"10.1109/CIC.1997.647955","DOIUrl":"https://doi.org/10.1109/CIC.1997.647955","url":null,"abstract":"A procedure to outline contours automatically in temporal sequences of cardiovascular images is presented. The contour determined on the n/sup th/ frame of the sequence is used as the starting contour to determine the contour on the (n+1)/sup th/ frame. When given a starting contour standard edge detectors can efficiently locate only ideal discontinuities with step shape. First and second Gaussian derivatives, computed at points p/sub i/ of the starting contour, directly provide amplitude and direction of the vectors which join p/sub i/ to the respective points of the final contour. Conversely, if the discontinuity does not show an ideal profile with step shape, the computation of the Gaussian derivatives must be carried out at all points between the starting and the final contour. In the paper, a property of the first order absolute moment is exploited to develop a robust and efficient iterative procedure which can be used to locate discontinuities that do not show an ideal step profile.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"134 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116343956","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
Diagnostic application of a universal kernel to time-frequency energy distribution of ECG signals 通用核函数在心电信号时频能量分布诊断中的应用
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647916
M. Tagluk, M. English, R. Vincent
{"title":"Diagnostic application of a universal kernel to time-frequency energy distribution of ECG signals","authors":"M. Tagluk, M. English, R. Vincent","doi":"10.1109/CIC.1997.647916","DOIUrl":"https://doi.org/10.1109/CIC.1997.647916","url":null,"abstract":"Time-frequency representation (TFR) is a way of describing the time-variant energy of a signal. Cohen's class of distributions is one of the most commonly used methods for generating TFRs. A universal kernel (UK) function that is capable of filtering out any cross terms occurring in the Wigner-Ville distribution (WVD) is proposed for time-variant energy distribution of ECG signals. The proposed technique promises detection of low level potentials occurring in an abnormal ECG pattern. Also, TFR images of filtered WVD of ECGs show potential in diagnostic applications.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"53 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132112038","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
3D echocardiography pre-processing for ventricular volume estimation 三维超声心动图预处理的心室容积估计
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.647893
F. Brancaleoni, K. Mikula, A. Sarti, C. Lamberti
{"title":"3D echocardiography pre-processing for ventricular volume estimation","authors":"F. Brancaleoni, K. Mikula, A. Sarti, C. Lamberti","doi":"10.1109/CIC.1997.647893","DOIUrl":"https://doi.org/10.1109/CIC.1997.647893","url":null,"abstract":"A method for left ventricular volume estimation based on 3D echographic data is presented. Pre-processing of 3D data is performed by means of two different nonlinear diffusion techniques: anisotropic diffusion and geometrical diffusion (mean curvature motion). Anisotropic diffusion, which assumes a high diffusion velocity in region with low brightness gradient and vice-versa, produces a filtering effect without smoothing the edges. On the contrary, geometrical diffusion, which assumes a diffusion velocity according to local curvature, produces a smoothing of surfaces. The ventricular volume is estimated through a floodfill operation and divergence theorem.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133253939","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
A generalised data model integrating biosignal records and clinical data for research and evaluation 一个综合生物信号记录和临床数据的通用数据模型，用于研究和评估
Computers in Cardiology 1997 Pub Date : 1997-09-07 DOI: 10.1109/CIC.1997.648015
H. Gross, V. Hartmann
{"title":"A generalised data model integrating biosignal records and clinical data for research and evaluation","authors":"H. Gross, V. Hartmann","doi":"10.1109/CIC.1997.648015","DOIUrl":"https://doi.org/10.1109/CIC.1997.648015","url":null,"abstract":"To support biomagnetic and bioelectric research and evaluation, we present a conceptual data model for integrating biosignal records and clinical data and show its implementation as a relational database system for ECGs and MCGs together with all further relevant patient data. Database design principles and special attention to ongoing research procedures and evaluations yield to a generalised, flexible and open-ended data model for biosignal databases.","PeriodicalId":228649,"journal":{"name":"Computers in Cardiology 1997","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1997-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132654664","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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