Optimization of acoustic emitted field of transducer array for ultrasound imaging

Issue title: Frontiers in Biomedical Engineering and Biotechnology – Proceedings of the 2nd International Conference on Biomedical Engineering and Biotechnology, 11–13 October 2013, Wuhan, China

Article type: Research Article

Authors: He, Zhengyao^{; ;}

Affiliations: Institute of Acoustic Engineering, Northwestern Polytechnical University, Xi'an, 710072, China

Note: [] Project supported by the National Natural Science Foundation of China (Grant Nos. 60901076 and 10734030), and the Hovering Star Plan of Northwestern Polytechnical University.

Note: [] Corresponding author. E-mail:hezhengyao@163.com

Abstract: A method is proposed to calculate the weight vector of a transducer array for ultrasound imaging to obtain a low-sidelobe transmitting beam pattern based on the near-field response vector. An optimization problem is established, and the second-order cone (SOC) algorithm is used to solve the problem to obtain the weight vector. The optimized acoustic emitted field of the transducer array is then calculated using the Field II program by applying the obtained weight vector to the array. The simulation results with a 64-element 26 MHz linear phased array show that the proposed method can be used to control the sidelobe of the near-field transmitting beam pattern of the transducer array and achieve a low-sidelobe level. The near-field sound pressure distribution of the transducer array using the proposed method focuses much better than that using the standard delay and sum (DAS) beamforming method. The sound energy is more concentrated using the proposed method.

Keywords: transducer array, acoustic emitted field, optimization, ultrasound imaging

DOI: 10.3233/BME-130921

Journal: Bio-Medical Materials and Engineering, vol. 24, no. 1, pp. 1201-1208, 2014