Proceedings of Computers in Cardiology Conference最新文献_第3页

Evaluation of parametric methods for the spectral analysis of Carpentier-Edwards heart valve sounds 卡彭蒂尔-爱德华兹心脏瓣膜音频谱分析参数方法的评价

Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378312

R. Bedi, J. Mcdonnell

引用次数: 3

An automated temporal alignment technique for the translational and rotational correction of digital radiographic images of Bjork-Shiley heart valves 一种用于比约克-希利心脏瓣膜数字放射图像平移和旋转校正的自动时间对齐技术

Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378326

E. Çesmeli, K. Powell, N. Greenberg, J. Cornhill

{"title":"An automated temporal alignment technique for the translational and rotational correction of digital radiographic images of Bjork-Shiley heart valves","authors":"E. Çesmeli, K. Powell, N. Greenberg, J. Cornhill","doi":"10.1109/CIC.1993.378326","DOIUrl":"https://doi.org/10.1109/CIC.1993.378326","url":null,"abstract":"An accurate technique for the temporal registration of digital radiographic valve images is an integral process in the objective quantification of single leg separation (SLS) in Bjork-Shiley Convexo Concave heart valves. The authors have developed a fully automated technique for the translational and rotational correction of sequential valve images based on the principal axes of the valve. This technique was chosen for ease of implementation, speed, and accuracy. The first step of the alignment procedure is to correct for translational and rotational motion by aligning the centroids of segmented valve images according to their principal axes. The second step involves a rotational correction for each leg of the outlet strut using a linear cross-correlation of data sampled along a specified are about the centroid. This technique has been successfully applied to a preliminary set (10 patients) of digital radiographic data (8-16 sequential frames). This technique was determined accurate to within 2 pixels at a spatial resolution of 139 /spl mu/m/pixel.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"30 1","pages":"619-622"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83398949","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

An integrated system for simultaneous acquisition and processing of physiologic and ultrasound data 同时采集和处理生理和超声数据的集成系统

Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378327

N. Greenberg, P. Vandervoort, W. Stewart, R. Savage, P. McCarthy, J.D. Thomas

引用次数: 5

Complex dynamics assessment in 24-hour heart rate variability signals in normal and pathological subjects 正常和病理受试者24小时心率变异性信号的复杂动力学评估

Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378419

M. Signorini, S. Guzzetti, R. Parola, S. Cerutti

{"title":"Complex dynamics assessment in 24-hour heart rate variability signals in normal and pathological subjects","authors":"M. Signorini, S. Guzzetti, R. Parola, S. Cerutti","doi":"10.1109/CIC.1993.378419","DOIUrl":"https://doi.org/10.1109/CIC.1993.378419","url":null,"abstract":"Long term regulation of beat-to-beat variability involves a different kind of control. Parametric models provide quantitative indices which measure short time regulating action of the autonomic nervous system. In the long period instead, nonlinear contributions can be put into evidence by a chaotic deterministic approach. For heart rate variability (HRV) series collected in the 24 hours in 14 normal subjects and 28 subjects with cardiovascular pathologies (11 severe heart failure, 11 essential hypertensive and 6 heart transplant), we extract some parameters which are reputed to be invariant characteristic of system attractor: fractal dimension, Kolmogorov entropy and Lyapunov exponents. Geometric representations in the state space, such as delay maps and phase space plots, describe system trajectories through the singular value decomposition method. All these parameters confirm the existence of nonlinear dynamics in HRV signals and show different values for normal and pathological subjects: in particular we notice a reduction of the complexity of the discrete series when passing from normal to pathological subjects.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"12 1","pages":"401-404"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81288043","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 miniature position and orientation locator for three dimensional echocardiography 一种用于三维超声心动图的微型位置和方向定位器

Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378513

Roy W. Martin, Ernest Blood, Florence Sheehan, Gerry Bashein, Catherine Otto, Frances Derook, Eric P. Filer, Xiang Li, Paul Detmer

{"title":"A miniature position and orientation locator for three dimensional echocardiography","authors":"Roy W. Martin, Ernest Blood, Florence Sheehan, Gerry Bashein, Catherine Otto, Frances Derook, Eric P. Filer, Xiang Li, Paul Detmer","doi":"10.1109/CIC.1993.378513","DOIUrl":"https://doi.org/10.1109/CIC.1993.378513","url":null,"abstract":"The accuracy of a new miniature prototype (6 mm/spl times/6 mm/spl times/9 mm) six dimensional (6D) locator sensor for three dimensional (3D) echocardiography was investigated. This new sensor identifies its 3D position and 3D orientation in space with respect to the position of a magnetic field generator. The sensor when attached to an ultrasound imaging transducer allows identifying and tracking the position and orientation in space of the ultrasonic imaging plane. The accuracy of this new miniature sensor was tested by rotating it on a lever arm apparatus which maintained a constant distance (R) from the sensor to the fixed point of rotation. At each rotational spatial position the sensor's readings were used to calculate the fixed point's position in space. The mean (MRE) and standard deviation (STDRE) of the radial error in this determination were calculated for N trials. The results with the apparatus: for R=10.6 cm were MRE=1.3 mm, STDRE=0.06 mm, N=500; and for R=18 cm they were MRE=1.8 mm, STDR=0.7 mm, N=500. It was then tested with a transcutaneous 5 MHz echo probe on 3D imaging a fixed position string target. The results in locating the position of the target was MRE=2.2 mm and STDRE=1.5 mm for N=45.<<ETX>>","PeriodicalId":20445,"journal":{"name":"Proceedings of Computers in Cardiology Conference","volume":"4 1","pages":"25-28"},"PeriodicalIF":0.0,"publicationDate":"1993-09-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90106142","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

Estimation of the correlation length of activation processes during atrial fibrillation 心房颤动时激活过程相关长度的估计

Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378509

J.M. Smith, G. Botteron

引用次数: 7

Determination of ischemic episodes in a real-time system 实时系统中缺血性发作的测定

Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378296

J. Presedo, J. Vila, S. Barro, R. Ruíz, F. Palacios

引用次数: 7

Correction of arterial flow velocity Doppler color mapping in transverse cross-sectional imaging 动脉血流速度多普勒彩色成像在横断成像中的校正

Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378449

D. Adam, K. M. Kempner, M. A. Vivino, E. Tucker, Michael L. Jones

引用次数: 1

In vitro evaluation of Doppler pressure gradient 体外评价多普勒压力梯度

Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378447

P. Verdonck, R. Verhoeven, A. Kleven

引用次数: 0

Spectral analysis of heart rate without resampling 无重采样的心率频谱分析

Proceedings of Computers in Cardiology Conference Pub Date : 1993-09-05 DOI: 10.1109/CIC.1993.378302

George Moody

引用次数: 137