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Computers in Cardiology, 2005最新文献

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Examining the potential of using thorax impedance measured by automated external defibrillators for quantification of circulation 探讨使用自动体外除颤器测量胸腔阻抗定量循环的潜力
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588228
M. Risdal, H. Losert, J. Nysaether, T. Eftestoel, F. Sterz, S. O. Aase
{"title":"Examining the potential of using thorax impedance measured by automated external defibrillators for quantification of circulation","authors":"M. Risdal, H. Losert, J. Nysaether, T. Eftestoel, F. Sterz, S. O. Aase","doi":"10.1109/CIC.2005.1588228","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588228","url":null,"abstract":"It has been suggested to acquire circulatory information from patients undergoing resuscitation from cardiac arrest by analyzing their thoracic electrical impedance using modified automated external defibrillators (AEDs). To investigate the potential of this idea, we studied the correlation between two impedance-derived parameters related to circulation, the negative peak of the impedance fluctuation (Zpeak) and its first time derivative (dZpeak), and arterial blood pressure measurements in 26 patients undergoing resuscitation and 32 hemodynamically stable patients. The highest correlation coefficient, rho=0.4338 was found between the systolic blood pressure and the magnitude of the negative peak of the first time derivative of the impedance. The poor correlation indicates that the impedance-derived parameters are not suitable for quantification of circulation, but can be used to indicate circulation","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114940698","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: 4
Regularization of phase contrast magnetic resonance images using optical flow and smoothness constraints 利用光流和平滑约束的相位对比磁共振图像正则化
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588026
E. Bergvall, K. Markenroth, E. Hedstom, H. Arheden, G. Sparr
{"title":"Regularization of phase contrast magnetic resonance images using optical flow and smoothness constraints","authors":"E. Bergvall, K. Markenroth, E. Hedstom, H. Arheden, G. Sparr","doi":"10.1109/CIC.2005.1588026","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588026","url":null,"abstract":"This paper presents a post processing strategy for myocardial velocity fields obtained by phase contrast magnetic resonance imaging. Such data can be used to track cardiac motion and to calculate strain. The method combines data regularization with optical flow estimation to overcome the partial volume effect in the image acquisition. Validation is performed both in vitro and in vivo and it is shown that the method improves the accuracy of cardiac motion tracking","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117052494","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
Interactive databases for cardiac rehabilitation: the "CardioDB" electronic archive elaborated by the Don Carlo Gnocchi foundation 心脏康复的交互式数据库:“CardioDB”电子档案由唐·卡洛·诺奇基金会精心制作
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588254
A. Conti, R. M. Lova, A. Conti, E. Ferrari, C. Macchi, G. Gensini
{"title":"Interactive databases for cardiac rehabilitation: the \"CardioDB\" electronic archive elaborated by the Don Carlo Gnocchi foundation","authors":"A. Conti, R. M. Lova, A. Conti, E. Ferrari, C. Macchi, G. Gensini","doi":"10.1109/CIC.2005.1588254","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588254","url":null,"abstract":"The main aim of Cardiac Rehabilitation is the reduction of new clinical events through cardiovascular risk factors control. In the Florence Cardiologic Unit of the Don Gnocchi Foundation Institute approximately 350 patients are managed each year. To perform a full follow-up analysis of the patients the data included in a traditional database are currently being transferred into the newly developed electronic archive of the Don Gnocchi Foundation. Through the insertion of the maximum possible quantity of numerical information as soon as it is available, clinical work is speeded up and a quality control of inserted data is possible. Such a system guarantees the possibility of producing complete diagnostic records by introducing numerical data; it also provides reports accounting for the outcome of treatments and even the discharge letter. The CardioDB is also functional for scientific research purposes since its quantitative content may be immediately accessed, processed and analyzed in statistical terms","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"289 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117301386","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
A novel watermarking technique for medical image authentication 一种新的医学图像认证水印技术
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588194
K. Pushpala, R. Nigudkar
{"title":"A novel watermarking technique for medical image authentication","authors":"K. Pushpala, R. Nigudkar","doi":"10.1109/CIC.2005.1588194","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588194","url":null,"abstract":"Medical images are stored in PACS (picture archiving and communication systems) that are accessed over the intranet by radiologists for diagnosis. These days the trend is shifting towards a Web based interface for accessing PACS (image) data. This calls for thorough security measures in the information system of the hospital to ensure integrity of medical image data that is being transferred over the public network. The paper analyses various watermarking techniques with a perspective of applying them to medical images stored on the PACS. It discusses the applicability of invertible watermarking technique for ensuring integrity of medical images. Any modification to the watermarked DICOM (digital imaging and communications in medicine) image can be detected with high reliability using invertible fragile watermarking system. A unique content based digital signature can be generated from the image data (pixel data) which would be embedded inside the image in an imperceptible way without increasing the data size that need to be transferred. This signature can be extracted at the radiologist viewer work stations and used for the authentication while the modified pixel data is restored back to original if the image is found to be authentic. This kind of distortion free (erasable) embedding procedure would ensure image retrieval without any modification to pixel data after the authentication process that caters to the unique need of medical images for diagnosis","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116282153","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
Hemodynamic effects of infarct location in left ventricular wall based on an integrated finite element and circulatory model 基于有限元和循环模型的左室壁梗死位置的血流动力学影响
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588225
S. Chiaramida, R. Dong, F. J. Vetter, Y. Sun
{"title":"Hemodynamic effects of infarct location in left ventricular wall based on an integrated finite element and circulatory model","authors":"S. Chiaramida, R. Dong, F. J. Vetter, Y. Sun","doi":"10.1109/CIC.2005.1588225","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588225","url":null,"abstract":"An integrated finite element and circulatory model was developed and used to assess the differential impact of infarct location on left ventricular hemodynamics. In this study a finite element model of the left ventricle (LV) was fully integrated with an electrical analog model of the circulatory system. The model was capable of generating pressure and volume waveforms that are consistent with the clinical observations. Simulations based on this model determined the hemodynamic effects of an infarction located near the base, mid-wall, or apex of the LV. Infarction near the apex showed lesser effects than infarctions near the base or the mid-wall. Infarctions near the base and mid-wall showed similar effects. The decrease in ejection fraction was most sensitive to infarction near the base, while the increase in end-systolic volume and end-diastolic volume was most sensitive to infarction near the mid-wall","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122029705","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
Physiological role of transverse-axial tubular system in cardiac ventricular myocytes: a simulation study 横轴小管系统在心室肌细胞中的生理作用:模拟研究
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588276
M. Pásek, J. Šimurda, C. Orchard, G. Christé
{"title":"Physiological role of transverse-axial tubular system in cardiac ventricular myocytes: a simulation study","authors":"M. Pásek, J. Šimurda, C. Orchard, G. Christé","doi":"10.1109/CIC.2005.1588276","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588276","url":null,"abstract":"Experimental data related to the transverse-axial tubular system of guinea pig and rat ventricular myocytes were incorporated into quantitative models of their electrical activity. The results of simulations suggest that activity-dependent depletion of Ca2+ within the tubular lumen decreases the intracellular Ca2+ load and intracellular Ca2+ transients in both species. However, considerable species differences in the magnitude of the depletion, its frequency dependence and the resulting effect on cellular activity were observed","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116842085","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
Increased dispersion of ventricular repolarization during recovery from exercise 运动后恢复时心室复极弥散度增加
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588040
H. Draisma, B. H. van Huysduynen, C. A. Swenne, A. Maan, E. E. van der Wall, M. Schalij
{"title":"Increased dispersion of ventricular repolarization during recovery from exercise","authors":"H. Draisma, B. H. van Huysduynen, C. A. Swenne, A. Maan, E. E. van der Wall, M. Schalij","doi":"10.1109/CIC.2005.1588040","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588040","url":null,"abstract":"In a recent study, frequent ectopy during recovery from exercise was reported to bear an increased risk for death, whereas frequent ectopy during exercise did not. We compared exercise- and recovery ECGs to corroborate the hypothesis that dispersion of ventricular repolarization is augmented during recovery. In healthy male subjects spanning a large range of fitness, we analyzed all 10-s ECGs recorded during maximal oxygen consumption tests. We selected for every recovery ECG the best heart rate-matched exercise ECG in the same subject, and compared several ECG parameters between the matched ECGs. The observed recovery-exercise differences in these parameters indicate that dispersion of ventricular repolarization increases early during recovery, particularly due to increased action potential duration heterogeneity. Increased vagal tone during recovery may be the cause of this potential threat, apparently most outspoken in highly fit subjects","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123977879","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: 9
Time-frequency characterization of simultaneous intra-atrial and electrocardiographic recordings during atrial fibrillation 房颤期间同时房内和心电图记录的时频特征
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588108
M. Stridh, A. Bollmann, D. Husser, A. Bhandari, D. Cannom, L. Sornmo
{"title":"Time-frequency characterization of simultaneous intra-atrial and electrocardiographic recordings during atrial fibrillation","authors":"M. Stridh, A. Bollmann, D. Husser, A. Bhandari, D. Cannom, L. Sornmo","doi":"10.1109/CIC.2005.1588108","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588108","url":null,"abstract":"A new method for characterization of simultaneous intra-atrial and ECG recordings during atrial fibrillation (AF) is presented. With different preprocessing, both types of signals are characterized using a logarithmic time-frequency distribution from which trends of frequency, regularity, morphology (only ECG) and signal quality are extracted. The objective of the study is to relate ECG measures of rate and morphology to measures of intra-atrial organisation. The algorithm has been tested on a database with simultaneous ECG and right atrial recordings from 34 patients with drug-refractory AF. The average frequency in lead V1 was 5.91 Hz (std=0.94) and the average exponential decay of harmonic magnitudes (reflecting the morphology) in V1 was 1.31 (std=0.38); their correlation coefficient was 0.53 (p<0.001). The correlation coefficient between spatial frequency dispersion in the right atrium and harmonic decay was 0.53 (p<0.005). More organized AF, observed in patients treated with amiodarone, was reflected by a lower frequency, smaller right atrial frequency dispersion and lower exponential decay","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129569450","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: 4
Continuous multiparameter monitoring of P wave parameters after CABG using wavelet detector 用小波检测器连续监测断桥后P波参数
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588264
S. Sovilj, G. Rajsman, R. Magjarevic
{"title":"Continuous multiparameter monitoring of P wave parameters after CABG using wavelet detector","authors":"S. Sovilj, G. Rajsman, R. Magjarevic","doi":"10.1109/CIC.2005.1588264","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588264","url":null,"abstract":"The aim of the study was to develop methodology for long-term study of ECG parameters, in particular the P wave parameters. In this study we address continuous monitoring of different P wave parameters in the group of patients after coronary artery bypass grafting (CABG) in order to examine potential predictors of atrial fibrillation. Lead II of the standard surface ECG was recorded in the period of typically 48 hours in patients after CABG. Dyadic wavelet transform analysis with first derivation of Gaussian smoothing function as a mother wavelet, was used for a QRS and a P wave detection, characterization and delineation. During the recording, for every patient, in every hour, vector of 108 P wave components was calculated, allowing continuous and deeper insight into atrial activity","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129577177","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
Contour detection of short axis slice MR images for contraction irregularity assessment 短轴切片MR图像收缩不规则性评估的轮廓检测
Computers in Cardiology, 2005 Pub Date : 1900-01-01 DOI: 10.1109/CIC.2005.1588023
A. Muller, A. Neitmann, N. Merkle, J. Wohrle, V. Hombach, H. Kestler
{"title":"Contour detection of short axis slice MR images for contraction irregularity assessment","authors":"A. Muller, A. Neitmann, N. Merkle, J. Wohrle, V. Hombach, H. Kestler","doi":"10.1109/CIC.2005.1588023","DOIUrl":"https://doi.org/10.1109/CIC.2005.1588023","url":null,"abstract":"A new method for automatically detecting left ventricular endocardial borders in cardiac MRI short-axis slices was applied to a previously published patient group for which manually drawn contours already existed. An initial point lying in the left ventricular endocardium was found by a size invariant circular Hough transform. A coarse segmentation of the endocardial region was completed by merging surrounding regions and building the convex hull. Adjacent time frames were used to remove jitter from the contour movements. A feature (IRM), extracted from those contours, quantified the irregularities of left ventricular contractions. Patients with dilated cardiomyopathy were separated from the control group by thresholding the IRM parameter","PeriodicalId":239491,"journal":{"name":"Computers in Cardiology, 2005","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130165528","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: 13
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