A Two-Dimensional Circular Array Transducer for Endoscopic Ultrasound Imaging of Tube.

The concept of endoscopic ultrasound (EUS) has been introduced to non-destructive testing for the inspection of tubular structure. However, the fixed normal focusing beam of the present EUS transducers obstructs imaging flexibility and limits the robustness of the inspection, particularly for planar reflectors. To address this challenge, a two-dimensional circular array (2-D CA) designed for three-dimensional focusing is developed in this paper.