A matrix phased array system for 3D high frame-rate imaging of the carotid arteries

We are developing a volumetric ultrasound system for high frame-rate imaging of the carotid artery. It will be used in early detection of atherosclerosis, specifically aiming at visualization of neovascularization inside vulnerable plaque. These small vessels will be visualized in 3D by harmonic imaging of ultrasound contrast agents. The main parts of the ultrasound system are a 1024 element matrix array, a 128 channel transmitter-receiver and custom multiplexer electronics. This paper discusses the design and results of individual elements and corresponding multiplexer channels of our prototype system. We measured a transmit bandwidth of 80%, a center frequency of 7.9 MHz, a pressure of 29 kPa/V at the transducer's surface, and > 95% well-functioning elements, which meets our requirements. A volume frame rate of 1.9 kHz is achievable.