2015 Computing in Cardiology Conference (CinC)最新文献_第10页

Detection of irregular heartbeats using tensors 利用张量检测不规则心跳

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7410975

Griet Goovaerts, O. D. Wel, B. Vandenberk, R. Willems, S. Huffel

{"title":"Detection of irregular heartbeats using tensors","authors":"Griet Goovaerts, O. D. Wel, B. Vandenberk, R. Willems, S. Huffel","doi":"10.1109/CIC.2015.7410975","DOIUrl":"https://doi.org/10.1109/CIC.2015.7410975","url":null,"abstract":"Automatic classification of heartbeats in different categories is important for ECG analysis. The number of irregular heartbeats in a signal can for example be used as a risk stratifier for sudden cardiac death. Current heart-beat classification methods typically use time or frequency domain features to characterize heartbeats. We propose the use of tensors to incorporate the structural information that is present in multilead ECG channels. Since different ECG leads provide information on a particular orientation in space, more robust detection can be done if all leads are considered. After preprocessing and heartbeat detection using wavelet-based methods, the ECG signal is segmented beat-by-beat. The different heartbeats are then placed in a three-dimensional tensor with dimensions time, channels and heartbeats. Canonical Polyadic Decomposition is used to decompose the tensor. The results are three loading vectors, corresponding to the dimensions of the original tensor. Through analysis of these loading vectors, irregular heartbeats can be detected using a simple thresholding procedure. The method has been applied to a subset of the St.-Petersburg Institute of Cardiological Technics 12-lead Arrhythmia Database available on Physionet. When applying the method to the first 10 signals, we obtain a mean sensitivity and specificity of more than 90%. These results indicate that the presented method is a new and reliable way of performing irregular heartbeat detection.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"168 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126117283","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

Left atrium MRI 4D-flow in atrial fibrillation: Association with LA function 心房颤动的左心房MRI 4d血流:与LA功能的关系

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7408572

M. Evin, F. Callaghan, C. Defrance, S. Grieve, A. Cesare, P. Cluzel, A. Redheuil, N. Kachenoura

{"title":"Left atrium MRI 4D-flow in atrial fibrillation: Association with LA function","authors":"M. Evin, F. Callaghan, C. Defrance, S. Grieve, A. Cesare, P. Cluzel, A. Redheuil, N. Kachenoura","doi":"10.1109/CIC.2015.7408572","DOIUrl":"https://doi.org/10.1109/CIC.2015.7408572","url":null,"abstract":"Left atrium (LA) is a principal site of thrombus formation inducing thromboembolic events, which have been associated with LA low flow velocities. Recent developments in magnetic resonance imaging (MRI) 4D flow analysis enable a non-invasive visualization of LA flow patterns. Our main objective was to investigate modifications of the main vortices in the LA with regards to LA functional indices in 4 patients with atrial fibrillation (AF) and 6 healthy volunteers. Vorticity threshold and Q-criterion indices were computed from the centered vorticity calculation on filtered 4D velocity MRI images. Phasic LA longitudinal strains were computed on cine MRI images using LA feature tracking algorithm. LA dilation in AF came along with a drop in LA longitudinal strains. Best correlations between LA flow and functional changes were found for velocity vs. longitudinal strains corresponding to reservoir and LA contraction phases (r=0.69 and r=0.81, p<;0.03). Similarly, the highest correlation was found during LA contraction phase for associations between LA longitudinal strains and Q-criterion (r=0.52). In AF, LA functional changes are tightly associated with flow disorganization during the cardiac cycle especially during LA contraction phase.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126704846","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

Three-dimensional echocardiography based evaluation of right ventricular remodeling in patients with pressure overload 基于三维超声心动图评价压力过载患者右心室重构

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7411134

F. Maffessanti, K. Addetia, M. Yamat, L. Weinert, R. Lang, V. Mor-Avi

{"title":"Three-dimensional echocardiography based evaluation of right ventricular remodeling in patients with pressure overload","authors":"F. Maffessanti, K. Addetia, M. Yamat, L. Weinert, R. Lang, V. Mor-Avi","doi":"10.1109/CIC.2015.7411134","DOIUrl":"https://doi.org/10.1109/CIC.2015.7411134","url":null,"abstract":"Although 3D echocardiography (3DE) allows imaging of right ventricular (RV) morphology, regional RV remodeling has not been evaluated using 3DE. We developed a technique to quantify regional RV shape and tested its ability to characterize RV shape in normal subjects and in patients with RV pressure overload. Transthoracic 3DE images were acquired in 54 subjects (39 patients with pulmonary artery hypertension, PAH, and 15 normal controls, NL). 3D RV surfaces were reconstructed at end-diastole and end-systole (ED, ES) and analyzed using custom software to calculate 3D mean curvature of the inflow and outflow tracts, apex and body (both divided into free-wall and septum). Septal segments in NLs were characterized by concavity (curvature<;O) in ED and slight convexity (curvature>O) in ES. Conversely, the septum remained convex throughout the cardiac cycle in P AH. In the NL group, the body free-wall transitioned from a convex surface to a more flattened surface during contraction, while the convexity of the apex free-wall increased. In contrast, in PAH, both RV free-wall segments remained equally convex throughout the cardiac cycle. Curvature analysis using 3DE allows quantitative evaluation of RV remodeling, which could be used to track diferential changes in regional RV shape, as a way to assess disease progression or regression.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"9 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130069263","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

Inter-study repeatability of left ventricular strain measurement using feature tracking on MRI cine images 利用MRI影像特征跟踪测量左心室应变的研究间重复性

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7408614

J. Lamy, G. Soulat, A. Redheuil, M. Evin, É. Mousseaux, N. Kachenoura

{"title":"Inter-study repeatability of left ventricular strain measurement using feature tracking on MRI cine images","authors":"J. Lamy, G. Soulat, A. Redheuil, M. Evin, É. Mousseaux, N. Kachenoura","doi":"10.1109/CIC.2015.7408614","DOIUrl":"https://doi.org/10.1109/CIC.2015.7408614","url":null,"abstract":"Feature tracking (FT) is a novel approach for myocardial strain evaluation from standard cine MRI. Conversely to tagging, an original feature of FT is its ability to analyze all heart chambers, independently of their wall thickness. However, few technical challenges, including its inter-study repeatability need to be investigated and this is the aim of our study. We studied 10 healthy individuals (59±9 years), who underwent 2 MRI exams, separated by two weeks. For each exam, cine short-axis slices corresponding to left ventricular (L V) basal, mid-L V and apical locations were analyzed, by the same operator, using a custom FT software to extract global peaks of 1-radial thickening (Er), 2-circumferential strain (Ec), and 3-endocardial radial motion (Erm). Briefly, the FT, based on spatial correlation, was applied to myocardial contours initially drawn on a single time phase. Bland-Altman analysis revealed low bias for comparison between the 2 exams (mean bias [±1.96·standard deviation] were: 0.02 [-0. 11,0. 14]% for Er, 0.00 [-0.04,0.05]% for Ec, 0.00 [-0.05,0.06]% for Erm). As expected, strain magnitudes decreased with age. The application of an automated FT on data systematically acquired during MRI provided consistent and reproducible LV myocardial strain measurements.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"897 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127793437","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

On the derivation of the spatial QRS-T angle from Mason-Likar leads I, II, V2 and V5 Mason-Likar引线I、II、V2和V5空间QRS-T角的推导

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7408612

D. Guldenring, D. Finlay, R. Bond, Alan Kennedy, J. Mclaughlin

{"title":"On the derivation of the spatial QRS-T angle from Mason-Likar leads I, II, V2 and V5","authors":"D. Guldenring, D. Finlay, R. Bond, Alan Kennedy, J. Mclaughlin","doi":"10.1109/CIC.2015.7408612","DOIUrl":"https://doi.org/10.1109/CIC.2015.7408612","url":null,"abstract":"The spatial QRS-T angle (SA) has been identified as a marker for changes in the ventricular depolarization and repolarization sequence. The determination of the SA requires vectorcardiographic (VCG) data. However, VCG data is seldom recorded in monitoring applications. This is mainly due to the fact that the number and location of the electrodes required for recording the Frank VCG complicate the recording of VCG data in monitoring applications. Alternatively, reduced lead systems (RLS) allow for the derivation of the Frank VCG from a reduced number of electrocardiographic (ECG) leads. Derived Frank VCGs provide a practical means for the determination of the SA in monitoring applications. One widely studied RLS that is used in clinical practice is based upon Mason-Likar leads I, II, V2 and V5 (MLRL). The aim of this research was two-fold. First, to develop a linear ECG lead transformation matrix that allows for the derivation of the Frank VCG from the MLRL system. Second, to assess the accuracy of the MLRL derived SA (MSA). We used ECG data recorded from 545 subjects for the development of the linear ECG lead transformation matrix. The accuracy of the MSA was assessed by analyzing the differences between the MSA and the SA using the ECG data of 181 subjects. The differences between the MSA and the SA were quantified as systematic error (mean difference) and random error (span of Bland-Altman 95% limits of agreement). The systematic error between the MSA and the SA was found to be 9.38° [95% confidence interval: 7.03° to 11.74°]. The random error was quantified as 62.97° [95% confidence interval: 56.55° to 70.95°].","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122432714","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

Speckle tracking analysis for early detection of cardiotoxicity in breast cancer patients 斑点跟踪分析在乳腺癌患者心脏毒性早期检测中的应用

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7408615

Cinzia Lorenzini, C. Lamberti, M. Aquilina

引用次数: 1

Fetal magnetic resonance image denoising based on homogeneity testing and Non Local Means 基于同质性检验和非局部均值的胎儿磁共振图像去噪

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7408656

K. Haris, George Kantasis, N. Maglaveras, A. Aletras

引用次数: 0

Magnetocardiography did not uncover electrically silent ischemia in an in-silico study case 在一个计算机研究病例中，心磁图没有发现电性无症状缺血

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7411118

D. Potyagaylo, G. Seemann, W. Schulze, O. Dössel

{"title":"Magnetocardiography did not uncover electrically silent ischemia in an in-silico study case","authors":"D. Potyagaylo, G. Seemann, W. Schulze, O. Dössel","doi":"10.1109/CIC.2015.7411118","DOIUrl":"https://doi.org/10.1109/CIC.2015.7411118","url":null,"abstract":"Over the last decades, the information content derived from cardiac electric and magnetic field measurements has been debated. Our co-workers Wilhelms et al. investigated electrically silent acute ischemia in human ventricles caused by occlusion of a coronary artery. In the present work, we extend the previous study by calculating associated magnetic fields produced by early stage acute ischemia with varying transmural extent. Multiscale computational simulations were performed for calculations of body surface potential maps (BSPM) and magnetocardiograms (MCG) on a magnetometer sensor matrix situated above the anterior chest wall. Depending on the ischemia size, the ST-segments of the simulated electrocardiograms (ECG) experienced depression for subendocardial cases and elevation for transmural ischemia. One intermediate extent resulted in a zero ST-segment which makes it diagnostically indistinguishable from the healthy case. Magnetic field calculations for this electrically silent ischemia also revealed no difference compared to the control case. Otherwise, both ECG and MCG signals during ST-segments showed either depression or elevation from zero line. In this simulation study, MCG did not deliver additional information to uncover electrically silent ischemia. For a general conclusion, further in-silico investigations with different ischemia shapes, sizes and positions should be performed and clinical studies with recordings of both ECG and MCG signals have to be conducted.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"171 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124172440","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

Interactive progressive-based approach to aid the human interpretation of the 12-lead Electrocardiogram 交互式渐进式方法，以帮助人类解释12导联心电图

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7408620

A. Cairns, R. Bond, D. Finlay, C. Breen, D. Guldenring, Rob Gaffney, Patrick Henn, A. Peace

引用次数: 2

Right ventricular diastolic function evaluation in magnetic resonance imaging 磁共振成像右室舒张功能评价

2015 Computing in Cardiology Conference (CinC) Pub Date : 2015-09-01 DOI: 10.1109/CIC.2015.7408593

N. Kachenoura, E. Bollache, A. Redheuil, S. Clément-Guinaudeau, L. Perdrix, B. Diebold, M. Ladouceur, É. Mousseaux

{"title":"Right ventricular diastolic function evaluation in magnetic resonance imaging","authors":"N. Kachenoura, E. Bollache, A. Redheuil, S. Clément-Guinaudeau, L. Perdrix, B. Diebold, M. Ladouceur, É. Mousseaux","doi":"10.1109/CIC.2015.7408593","DOIUrl":"https://doi.org/10.1109/CIC.2015.7408593","url":null,"abstract":"Although few studies demonstrated the ability of MRI dynamic anatomical sequences to assess right ventricular (RV) diastolic function, no data are available for velocity-encoded MRI (VE-MRI). Accordingly, our aim was to evaluate RV diastolic function from VE-MRI, as compared to reference Doppler echocardiography. We studied 109 healthy individuals (67 men, age: 42±15 years) who underwent RV Doppler echocardiography and MRI, on the same day. VE-MRI images were analyzed using custom software, providing: tricuspid flow early peak velocity (E,cm/s) and flow-rate (Ef,ml/s), atrial peak velocity (A,cm/s) and flow-rate (Af,ml/s), longitudinal myocardial early peak velocity (E'). Same velocity parameters were extracted from Doppler echocardiography (E, A, E/A, E', E/E'). Despite the fair associations between MRl and echocardiographic indices, the highest correlation with age was obtained for MRI flow-rate ratio Ef/Af (r=O. 60). Associations with age for velocity ratios (E/A) were equivalent for MRI and echocardiography (r=0.41). Automatically extracted PC-MRI tricuspid inflow parameters were strongly related to age. These associations were comparable to echocardiography for maximal velocities ratio and were stronger when considering peak flow-rates ratio.","PeriodicalId":414802,"journal":{"name":"2015 Computing in Cardiology Conference (CinC)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128988871","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