Aberration correction using moving particles speckle noise for ultrafast ultrasonic imaging

Abstract

The correction of sound speed heterogeneities is an important problem in trans-skull and deep organs imaging. Among all the proposed adaptive focusing methods, time reversal is an elegant one that enables to know the Green's function between the ultrasonic array and a punctual scatterer. However, in the absence of strong well resolved scatterers, time reversal is not useful. In this work we propose to use the echoes coming from moving particles in a flow to generate a virtual point-like scatterer and focus on it by iterative time reversal. This method enables to focus adaptively anywhere a flow is present. Then we use the Green's function to correct the ultrasound images. First, we apply this technique using focused wave then to improve it, we use the ultrafast plane wave imaging and synthetic focusing