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

We are developing a volumetric ultrasound system for high frame-rateimaging of the carotid artery. It will be used in early detection ofatherosclerosis, specifically aiming at visualization of neovascularizationinside vulnerable plaque. These small vessels will be visualized in 3D byharmonic imaging of ultrasound contrast agents. The main parts of the ultrasoundsystem are a 1024 element matrix array, a 128 channel transmitter-receiver andcustom multiplexer electronics. This paper discusses the design and results ofindividual elements and corresponding multiplexer channels of our prototypesystem. 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-functioningelements, which meets our requirements. A volume frame rate of 1.9 kHz isachievable.

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