Skull Shape Dependence of Convergence and Focusing Properties of Transcranial Acoustic Lens Constructed by Optimizing Arrangement of Point-like Scatterers

Abstract

We have modeled the skull by a circular array of point-like scatterers, and optimized the arrangement of point-like scatterers constructing a transcranial ultrasonic lens by the condition that the sound field intensity within the skull has a peak at a focal point and vanishes at any other points, and shown that an ultrasonic lens with sufficient function is realized. In this paper, we analyze the case of an elliptical skull, and show that even for this case as well, the proposed optimization yields a arrangement of scatterers with equivalent performance to the case of a circular skull.