An Overview about Speckle-tracking imaging Values among asthmatic patients

Abstract

Speckle-tracking imaging (STI) is a non-invasive ultrasound technique that allows an objective and quantitative evaluation of global and regional myocardial function, independently from the angle of insonation and partly from cardiac translational movements. Echocardiographic estimation of segmental left ventricular contractility is routinely accomplished through visual interpretation of endocardial motion and myocardial thickening. This method is subjective and requires a relatively experienced observer. Quantitative analysis based on tracing of the endocardial border may also be hampered by endocardial “dropout” and trabeculations. STI is based on bi-dimensional (2D) echocardiographic technology, not limited by Doppler analysis Segments of myocardial tissue show a pattern of gray values in the ultrasound. This pattern, resulting from the spatial distribution of gray values, is commonly referred to as speckle pattern, characterizes the underlying myocardial tissue acoustically and is unique for each myocardial segment. Speckle tracking allows the measure of all in-plane components of the velocity vector, in all pixels More recently, the addition of the third dimension (3D) has partly expanded the scope of this technology