Fig. 7: The focusing performance of different array configurations without steering.

a Transducer element distribution, including the semi-spherical array, uniform flexible array, spiral flexible array, and random-patterned flexible array, each consisting of 100 elements. b The x-y and y-z cross-sectional images of focal pressure pattern by different arrays. c The x-y and y-z cross-sectional images of the sidelobe patterns by different arrays. The main lobes are removed to highlight the sidelobes.