Gated Transmit and Fresnel-Based Receive Beamforming With a Phased Array for Low-Cost Ultrasound Imaging

被引:2
作者
Yen, Jesse T. [1 ]
Nguyen, Man Minh [1 ,2 ]
Lou, Yang [1 ]
Shin, Jun S. [1 ,2 ]
Chen, Yuling [1 ,3 ]
Tarnoff, Harry L. [4 ]
机构
[1] Univ Southern Calif, Dept Biomed Engn, Los Angeles, CA 90089 USA
[2] Philips Res North Amer, Cambridge, MA 01890 USA
[3] Zonare Med Syst Inc, Mountain View, CA 95002 USA
[4] DataPlex Inc, Huntington Beach, CA 92648 USA
关键词
Array signal processing; Delays; Ultrasonic imaging; Multiplexing; Phased arrays; Logic gates; Transmitters; Beamforming; focusing; Fresnel; portable; ultrasound; DUAL APODIZATION;
D O I
10.1109/TUFFC.2021.3062850
中图分类号
O42 [声学];
学科分类号
070206 ; 082403 ;
摘要
Low-cost ultrasound imaging systems are desired for many applications outside of radiology and cardiology departments. By making ultrasound systems smaller and lower cost, the use of ultrasound has spread from these mainstays to other areas of the hospital such as emergency departments and critical care. To further miniaturize and reduce the cost of ultrasound systems, we have investigated novel Fresnel-based beamforming methods to reduce front-end hardware requirements. Previous studies with linear and curvilinear arrays demonstrated comparable imaging performance using Fresnel-based beamforming versus delay-and-sum (DAS) beamforming. In this work, we extend Fresnel-based beamforming to phased arrays with beam steering. To accomplish this in transmit mode, we introduce a technique called a gated transmit beamformer where multicycle bursts are gated using multiplexers. In receive mode, a 64-element 2.5-MHz phased array is broken up into four 16-element subapertures, and each subaperture performs Fresnel beamforming before a final beamforming step is done. Timing errors are inevitable with Fresnel-based beamforming leading to higher sidelobe and clutter levels. To suppress sidelobe and clutter contributions, we also combine this with our previous technique, dual apodization with cross correlation (DAX) to improve contrast. Field II simulations are performed to evaluate spatial resolution and contrast-to-noise ratio and compared to standard DAS beamforming. Fresnel-based and gated transmit beamforming is also implemented using synthetic aperture data from tissue-mimicking phantoms. Lastly, a hardware proof-of-concept (PoC) Fresnel beamformer was designed, assembled, and evaluated with images from tissue-mimicking phantoms and initial in vivo images.
引用
收藏
页码:2183 / 2192
页数:10
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