A multiplexed two-dimensional array for real time volumetric and B-mode imaging

The Duke University real time volumetric imaging system employs receive mode parallel processing to increase image frame rate. This technique has an associated reduction in image resolution and contrast due to the requirement of a wide transmit beam. Since B-mode imaging can be accomplished in real time without this constraint, the authors propose a multiplexed 2-D array which has 2 sets of elements, one designed for volumetric imaging and one designed for B-mode imaging with improved resolution. The interconnection of this array is challenging due to the large number of elements. The authors have developed a new technique for 2-D array interconnection which employs a thin multilayer flexible circuit. The flex circuit element performance was comparable to hand wired 2-D arrays with greatly reduced fabrication time, regardless of the number of connections