Validation Against Laser Particular Velocity Imaging of A New Algorithm of Echo Contrast Tracking Based on Optical Flow Algorithm for Echo Piv Method
Circulation（2010）
Abstract
Background: Like optical Particular Velocity Imaging (PIV) analysis, Echo-PIV (EPIV) is usually based on a crosscorrelation technique. Although preliminary studies have shown high spatial resolution, a small dynamic range limits this technique. We have recently described a new method based on Optical flow algorithm applied to corrected raw B mode backscattered images (digital format prior to scan conversion). We thought validate the accuracy of this method againts PIV to describe intraventricular complex flow fields in experimental conditions. Methods: In vitro model: Atrio-ventricular simulator with a bioprostheses in mitral position. Stroke volume range from 30 to 70 ml, Frame rate (FR) from 178 to 530 i/s. Echo contrast concentration was kept stable along the experimentation Mechanical index :0.21. Image processing. Pre-treatment (1) Removing noise through soft wavelet thresholding method. (2) Decomposition of echo-piv sequence into: (a) geometrical component, (b) textural component (b) and © noise. (3...
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Key words
Contrast echo,Echocardiography,Cardiac imaging
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