Performance of SARUS: A synthetic aperture real-time ultrasound system

Abstract

Abstract-The SARUS scanner (Synthetic Aperture Real-time Ultrasound System) for research purposes is described. It can acquire individual channel data for multi-element transducers for a couple of heart beats, and is capable of transmitting any kind of excitation. It houses generous and flexible processing resources that can be reprogrammed and tailored to many kinds of algorithms. The 64 boards in the system house 16 transmit and 16 receive channels each, where data can be stored in 2 GB of RAM and processed using four Virtex 4FX100 and one FX60 FPGAs. The VHDL code can acquire data for 16 channels and perform real-time processing for four channels per board. The receive processing chain consists of three FPGAs. The beamformer FPGA houses 24 focusing units (6 x 4-way) each working in parallel at 220 MHz for parallel four-channel beamforming. The fully parametric focusing unit calculates delays and apodization values in real time in 3D space and can produce 630 million complex samples per second. The processing can, thus, beamform 192 image lines consisting of 1024 complex samples for each emission at a rate of 3200 frames a second yielding full nonrecursive synthetic aperture B-mode imaging at more than 30 high resolution images a second.

Measuring 3D velocity vectors using the Transverse Oscillation method

“…At a sampling frequency of 70 MHz, data from all the 1024 active elements are acquired simultaneously through the 1024 channels on the synthetic aperture real-time ultrasound system (SARUS) [26]. Data are stored for offline processing.…”

Directional synthetic aperture flow imaging using a dual stage beamformer approach

“…The transmission and receive are controlled by SARUS [14] and all the channel data is sampled by SARUS and stored to a disk, and then processed offline.…”

Second harmonic imaging using synthetic aperture sequential beamforming

“…1. The investigation is made by an experimental scanner -Synthetic Aperture Real-time Ultrasound System (SARUS) [4]. A linear array transducer (BK8804, from BK Medical Aps) is used to transmit and receive data from a wire phantom in water.…”