基于大张角双频聚焦换能器的振动声成像-《中国医学物理学杂志》

文章信息/Info

Title:: Vibro-acoustography based on large-angle dual-frequency focused transducer

作者:: 曹琳娜1; 罗婕妤1; 确太降初1; 周小伟1; 2; 李雁浩1; 2; 1.重庆医科大学生物医学工程学院/超声医学工程国家重点实验室，重庆 400016； 2.超声医疗国家工程研究中心，重庆 401121

Author(s):: CAO Linna1; LUO Jieyu1; QUETAI Jiangchu1; ZHOU Xiaowei1; 2; LI Yanhao1; 2; 1. State Key Laboratory of Ultrasonic Medical Engineering/College of Biomedical Engineering, Chongqing Medical University, Chongqing 400016, China 2. National Engineering Research Center of Ultrasonic Medicine, Chongqing 401121, China

Keywords:: Keywords: large-angle dual-frequency focused transducer ultrasound stimulated acoustic emission vibro-acoustography spatial resolution focused ultrasound

摘要:: 为提高振动声成像方法的空间分辨率，采用大张角双频聚焦换能器构建改进的振动声成像系统。基于该系统，以仿体为实验对象，探究振动声成像空间分辨率，测试该成像方法在不同声学特性仿体上的成像效果，研究接收水听器位置、差频对振动声成像结果的影响，并使用k-Wave建立仿真模型探究换能器元件分布对振动声成像结果的影响。结果表明基于大张角双频聚焦换能器的振动声成像系统空间分辨率较高，对声学特性不同的仿体成像具有良好的对比度和特异性，接收水听器的位置和换能器元件分布对成像结果影响较小，差频的选取对成像质量至关重要。该研究有望为振动声成像技术的发展进步提供新思路，推动该技术进一步走向实际应用。

Abstract:: Abstract: To enhance the spatial resolution of vibro-acoustography, an improved vibro-acoustography system is constructed using a large-angle dual-frequency focused transducer. Based on this system, mimicking phantoms are used as the experimental objects to explore the spatial resolution of vibro-acoustography, and test the vibro-acoustography results of mimicking phantoms with different acoustic characteristics. Additionally, the effects of the position of hydrophone and difference frequency on the vibro-acoustography results are studied, and the effects of transducer component distribution on vibro-acoustography results are analyzed with a simulation model established with k-Wave. The research results indicate that the vibro-acoustography system with a large-angle dual-frequency focused transducer has higher spatial resolution, contrast and specificity in imaging mimicking phantoms with different acoustic characteristics. The choice of difference frequency is critical for the imaging quality, but the position of the hydrophone and transducer component distribution have trivial effects on vibro-acoustography results. The study is expected to provide new ideas for the development of vibro-acoustography technology, and to promote its further practical application.