Speaker
Description
Focused ultrasound is a widely used non-invasive diagnostic and therapeutic tool in modern medicine. A crucial assumption in of its all applications is a constant sound speed in the observed medium. Non-constant sound speeds lead to actual times of flight of the ultrasound waves through the medium differing from calculated times of flight, which are accounted for in focusing algorithms. This leads to an aberrated focus, blurring ultrasound images. As real-time ultrasound imaging is computationally expensive, a fast aberration correction method is needed. In this talk, we present adapted ultrasound focusing algorithms based on geometrical acoustics that make a step into this direction. In a known layered medium setting, it is possible to calculate the correct times of flight. The resulting adapted focusing algorithms correct for the aberrations caused by the different sound speeds in the medium layers. Numerical simulations to determine the precision of our methods are conducted. And finally, the improvements obtained by our Methods in reconstructing Ultrasound Images are demonstrated.
