Multi pre-focused annular array for high resolution ultrasound imaging

摘要: An annular ultrasound bulk wave transducer array for electronic depth steering of symmetric focus from a near F n to far f includes elements that are divided into k groups with different fixed prefocusing. The central group participates in beam forming , the next outer n1 >F and kth nk n,k-1 . is selected at between In this manner, formation close performed only by group. By outward focal diameter increases and, where exceeds limit, included formation. This increase aperture area reduces subsequent as further steered toward same foci deeper than presenting growing enables maintenance tae below limits low total number avoids impractically small widths elements. may also be subdivided angular direction, allowing phase aberration correction.