Dynamic focusing capabilities of fully populated multielement phased arrays for non-invasive ultrasound surgery applications

New ultrasound surgery applications that are based on the use of multielement phased arrays and high-amplitude nonlinear irradiation regimes require maximum achievable ultrasound intensities at the focus. With the predetermined shape and aperture of the array and intensity at the surface of its elements, the only possibility for increasing focal intensities is a maximally dense packing of the elements at the array surface. In this paper, a prototype of such an ultrasound surgery array with random distribution of elements on its surface has been developed, having the maximum possible (100% without taking into account technological gaps between the elements) density of filling by elements in the form of equal area polygons.