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We studied hemodynamics characteristics at the heart level for a lot of 15 obese patients. We investigated echocardiographic and multigated radionuclide parameters correlating with the body mass index (BMI) or left ventricular ejection fraction (LVEF). Furthermore, the linear relationship obtained by plotting end-systolic volume (ESV) against end-diastolic volume (EDV) can be more useful than the...
The present study examines the effects of obesity on left ventricular (LV) biomechanics in obese women. Thirty-two women were evaluated: 12 were non-obese (body mass index BMI < 30 kg/m2) and 20 were obese (BMI > 30 kg/m2); ten of which were hypertensive and ten were non-hypertensive. Left ventricular dimensions and systolic and diastolic functions were assessed by 2D echocardiography and tissue...
3D soft tissue information, which X-ray images cannot provide but 3D echocardiographic imaging can, may be required in cardiac catheter-based interventions. In this paper, we propose a real-time catheter tracking strategy in echocardiographic sequences based on catheter segmentation in 2D X-ray images and registration between these two modalities. Firstly the segmentation from X-ray and the registration...
Objective: To assess the accuracy of audio signal processing system in noninvasive automatic estimation of pulmonary arterial pressure(PAP). Methods: Comparative studies among Doppler echocardiography, audio signal processing system (ASPS) and cardiac catheterization for predicting PAP have been done in 51 children with left-to-right shunting congenital heart disease. Results: Estimated pulmonary...
Obesity is a major health problem worldwide, with important economic and social effects. Obesity affects cardiovascular and respiratory systems directly. In this paper, after presenting a noninvasive indicator of contractility, based on the clinical echocardiografic measurements, a computer model (implemented in Simulink) based on the simplified circuit of the cardiovascular model is used, taking...
The left ventricular (LV) shape alteration is believed that has close correlation with cardiac disease and LV regional function. In this paper, we propose a set of procedure to evaluate LV shape deformation quantitatively and precisely. The LV myocardial shape of first cardiac cycle (end diastole) is reconstructed using a set of control points manually by expert and then tracked to last cardiac cycle...
In base of the Approximation of the liquid to blood, this paper numerically analyzed the dynamic of ultrasound contrast agent with matlab. Discussed different influence of the dynamic of the ultrasound contrast agent (UCA) because of different parameters of incident ultrasound and the mircobubble. The result shows that the degree of the microbubble oscillation increases with the increase of the incident...
The diagnosis of left ventricular mechanical dyssynchrony (LVMD) and identifying cardiac resynchronization therapy (CRT) candidates are challenging problems due to the limitation of the currently applied regional volume-curve analysis. In this study, four-dimensional (4D, 3D+time) left ventricle (LV) regional shape models of 26 LVMD patients were constructed from pre- and/or post- CRT real-time 3D...
This work explored two methodologies for clustering independent components (ICs) into physiological groups corresponding to maternal respiratory (MR), maternal cardiac (MC), foetal cardiac (FC), or noisy (N) activities. The methods, based on frequency content (S) or time-structure (R) analyses, were tested on 750 ICs (extracted from 25 abdominal phonograms by using single-channel independent component...
Systolic time intervals (STI) have shown significant diagnostic and prognostic value to assess the global cardiac function. Their value has been largely established in hospital settings. Currently, STI are considered a promising tool for long-term patient follow-up with chronic cardiovascular diseases. Several technologies exist that enable beat-by-beat assessment of STI in personal health application...
The expertise and experience are required for an examiner to diagnose using echocardiogram. To evaluate the synchronicity of motion in the heart, the tissue Doppler imaging (TDI) technique is popular but it has anisotropy in motion detection. Therefore, we have developed software to recognize the synchronous motion of heart by calculating intersection points between the instantaneous velocities of...
The objective of this paper is to assess the accuracy of audio signal Processing system in noninvasive automatic estimation of Pulmonary arterial pressure(PAP). Comparative studies among Doppler echocardiography, audio signal processing system (ASPS) and cardiac catheterization for predicting PAP have been done in 51 children with left-to-right shunting congenital heart disease. Estimated pulmonary...
Combined assessment of left ventricular (LV) shape and function could provide new insights into the process of LV remodeling. Real-time 3D echocardiography (RT3DE) allows rapid and accurate semi-automated extraction of LV endocardial surfaces. Our aims were to quantify LV morphology both globally, using conical (C) and spherical (S) indexes, and locally, studying the mean curvature, in a large set...
The paper presents the results of a signal processing approach to detect and isolate systolic murmurs. The identification of the first and second heart sounds and separating systole and diastole from a complete cardiac cycle were successfully carried out through wavelet analysis using an orthogonal Daubechies (db6) wavelet as the mother wavelet. At the fifth level of decomposition, S1 and S2 were...
The objective of this paper is to propose a framework in order to make the comparison of image processing algorithms effective. This framework was applied to three methods developed for automated regional wall motion scoring and they were compared to a reference scoring on a database of echocardiographic images (Evalechocard). Firstly, 200 annotated echocardiograms on hundred patients were used for...
Left ventricular (LV) shape is strictly related to LV function. Previously proposed shape indexes suffer from their intrinsic 2D nature. Our aim was to develop a method to quantify directly 3D LV shape from LV surfaces semi-automatically detected from real-time 3D echocardiographic (RT3DE) images. First, a monodimensional shape descriptor has been obtained by sampling through an helical pattern the...
The use of a tele-echocardiography system requires the use of lossy compression in order to reduce the transmission rates. That's the reason because guaranteeing clinical quality is a highly desired goal. In this paper we introduce two types of tests designed to obtain cardiologists' opinion and translate them to a clinical index. After that, we use this index to establish the recommendable transmission...
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