一种用于超声阵列成像的旁瓣抑制近场波束形成方法。
A sidelobe suppressing near-field beamforming approach for ultrasound array imaging.
作者信息
He Zhengyao, Zheng Fan, Ma Yuanliang, Kim Hyung Ham, Zhou Qifa, Shung K Kirk
机构信息
Institute of Acoustic Engineering, Northwestern Polytechnical University, Xi'an 710072, China.
Department of Biomedical Engineering and National Institutes of Health Transducer Resource Center, University of Southern California, Los Angeles, California 90089, USA.
出版信息
J Acoust Soc Am. 2015 May;137(5):2785-90. doi: 10.1121/1.4919318.
A method is proposed to suppress sidelobe level for near-field beamforming in ultrasound array imaging. An optimization problem is established, and the second-order cone algorithm is used to solve the problem to obtain the weight vector based on the near-field response vector of a transducer array. The weight vector calculation results show that the proposed method can be used to suppress the sidelobe level of the near-field beam pattern of a transducer array. Ultrasound images following the application of weight vector to the array of a wire phantom are obtained by simulation with the Field II program, and the images of a wire phantom and anechoic sphere phantom are obtained experimentally with a 64-element 26 MHz linear phased array. The experimental and simulation results agree well and show that the proposed method can achieve a much lower sidelobe level than the conventional delay and sum beamforming method. The wire phantom image is demonstrated to focus much better and the contrast of the anechoic sphere phantom image improved by applying the proposed beamforming method.
提出了一种抑制超声阵列成像中近场波束形成旁瓣电平的方法。建立了一个优化问题，并使用二阶锥算法来解决该问题，以基于换能器阵列的近场响应向量获得权重向量。权重向量计算结果表明，该方法可用于抑制换能器阵列近场波束图的旁瓣电平。通过使用Field II程序进行模拟，得到了将权重向量应用于线阵模型阵列后的超声图像，并使用64阵元26 MHz线性相控阵通过实验获得了线阵模型和无回声球体模型的图像。实验和模拟结果吻合良好，表明该方法能实现比传统延迟求和波束形成方法低得多的旁瓣电平。通过应用所提出的波束形成方法，线阵模型图像显示聚焦效果更好，无回声球体模型图像的对比度得到改善。
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