Ultrasonic 2D Matrix Array Transducer for Volumetric Imaging in Real Time

摘要

Matrix array transducers have been developed in this work for cardiac imaging in real-time and 3D. The matrix array transducers have 4,096 (64×64) active elements made of the piezoelectric single crystal, PMN-PT, within 1 inch square. Two different matrix array structures have been developed: (1) fabrication of whole 64x64 elements as a single unit on a PMN-PT plate with a conductive backing, and (2) assembly of eight 64×8 element modules to compose 64x64 channels. Optimal structures of the two matrix array transducer types were determined through finite element analysis to have their center frequency at 3.5 MHz and fractional frequency bandwidth over 60%. Fabricated prototype of the transducers satisfied the design specifications very well.