2008 Computers in Cardiology最新文献_第3页

Segmentation of heart sound recordings from an electronic stethoscope by a duration dependent Hidden-Markov Model 基于时间依赖的隐马尔可夫模型分割电子听诊器心音记录

2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749049

S. Schmidt, E. Toft, C. Holst-Hansen, C. Graff, J. Struijk

引用次数: 53

Short term variability of oxygen saturation during hemodialysis is a warning parameter for hypotension appearance 血液透析期间血氧饱和度的短期变化是低血压出现的警告参数

2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749183

E. Mancini, L. Corazza, D. C. Cannarile, M. Soverini, S. Cavalcanti, S. Cavani, A. Fiorenzi, A. Santoro

引用次数: 20

Comparing symbolic representations of cardiac activity to identify patient populations with similar risk profiles 比较心脏活动的符号表示来识别具有相似风险概况的患者群体

2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4748983

Z. Syed, B. Scirica, C.M. Stultz, J.V. Guttag

引用次数: 1

Assessment of cardiovascular risk markers from ultrasound images: System reproducibility 从超声图像评估心血管危险标志物:系统可重复性

2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4748988

E. Bianchini, A. Corciu, L. Venneri, F. Faita, C. Giannarelli, V. Gemignani, M. Demi

引用次数: 5

Wavelet variance differences in atrial fibrillation during anaesthetic effect 麻醉效果中心房颤动的小波方差差异

2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749118

R. Cervigón, F. Castells, J. Moreno, J. Mateo, C. Sánchez, J. Millet

{"title":"Wavelet variance differences in atrial fibrillation during anaesthetic effect","authors":"R. Cervigón, F. Castells, J. Moreno, J. Mateo, C. Sánchez, J. Millet","doi":"10.1109/CIC.2008.4749118","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749118","url":null,"abstract":"Effect of anaesthetic agents in restoration rhythm procedures during atrial fibrillation (AF) has not been fully investigated. We evaluated the effects of a widely used anaesthetic agent (propofol) in the fibrillation patterns. Intra-atrial recordings belong to 18 patients diagnosed with AF were analyzed ldquobeforerdquo (baseline) and ldquoduringrdquo anaesthetic infusion. The goal of this study is to characterize the variation in atrial properties along the atria in both states. The wavelet variance decomposes the variance of a time series on a scale by scale basis and hence has considerable appeal when physical phenomena are analyzed in terms of variations operating over a range of different scales. Moreover, the variance estimates are more accurately determined with a maximal-overlap version of the wavelet transform (MODWT). As mother wavelet was used the Haar wavelet where the signal was partitioned over seven scales. Wavelet analysis highlights a significant lower changes during the anaesthetic infusion respect to the basal conditions in the right atrium, with an opposite effect and non significant values in the left atrium. The proposed methodology provides an additional approach to the understanding of the role of the anaesthetic, showing a decrease in the variance inter-scales during the anaesthetic infusion in the right atrium, with the opposite effect in the left atrium.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123663455","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

Non-rigid motion compensation in free-breathing myocardial perfusion magnetic resonance imaging 自由呼吸心肌灌注磁共振成像中的非刚性运动补偿

2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749079

G. Wollny, M. Ledesma-Carbayo, P. Kellman, A. Santos

{"title":"Non-rigid motion compensation in free-breathing myocardial perfusion magnetic resonance imaging","authors":"G. Wollny, M. Ledesma-Carbayo, P. Kellman, A. Santos","doi":"10.1109/CIC.2008.4749079","DOIUrl":"https://doi.org/10.1109/CIC.2008.4749079","url":null,"abstract":"Breathing movements during the image acquisition of first-pass gadolinium enhanced, magnetic resonance imaging (MRI) hinder a direct automatic analysis of the myocardial perfusion. In addition, a qualitative readout by visual tracking is also more difficult as well. Non-rigid registration can be used to compensate for these movements in the image series. Because of the local contrast and intensity change over time, the registration method needs to be chosen carefully. We propose to make use of the periodicity of the breathing movement when patients are allowed to breath freely during image acquisition. Specifically, we propose to first identify a subset of the images that corresponds to the same phase of the breathing cycle and register these to compensate for the residual differences. By using a combination of normalised gradient fields and the sum of squared differences we circumvent the problems arising from the change of intensity. Then, for each of the remaining images, reference images of a similar intensity distribution are created by a linear combination of images from the align subset. In the last step, registration is achieved by minimising the sum of squared differences. Our first experiments show that this approach is well suited to compensate for the breathing movements.","PeriodicalId":194782,"journal":{"name":"2008 Computers in Cardiology","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123690660","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

Source separation of Foetal Heart Sounds and maternal activity from single-channel phonograms: A temporal independent component analysis approach 从单通道录音中分离胎儿心音和母体活动的源:一种时间独立分量分析方法

2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749200

A. Jiménez-González, C.J. James

引用次数: 17

T-wave alternans ranking: Striking disagreement between two vectorcardiographic measures of repolarization heterogeneity t波交替排序:两种复极化异质性矢量心动图测量之间的显著差异

2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749094

Sumche Man, Arie C. Maan, M. Schalij, E. E. V. D. Wall, Cees A. Swenne

引用次数: 1

In vitro characterization of bileaflet Mechanical Heart Valves closing sound 双小体机械心脏瓣膜关闭声的体外表征

2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749199

A. Bagno, R. Buselli, F. Anzil, V. Tarzia, V. Pengo, A. Ruggeri, T. Bottio, G. Gerosa

引用次数: 7

Reproducibility of IVUS measurements in heart transplant recipients: Increased quality of data by using dedicated software for image analysis 心脏移植受者IVUS测量的可重复性:通过使用专用软件进行图像分析，提高数据质量

2008 Computers in Cardiology Pub Date : 2008-09-01 DOI: 10.1109/CIC.2008.4749097

V. D’Errico, L. Potena, D. Fiore, F. Fabbri, F. Grigioni, G. Magnani, P. Ortolani, I. Bianchi, I. Corazza, R. Zannoli, A. Branzi

引用次数: 3