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。
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.
作者
曹琳娜
罗婕妤
确太降初
周小伟
李雁浩
CAO Linna;LUO Jieyu;QUETAI Jiangchu;ZHOU Xiaowei;LI Yanhao(State Key Laboratory of Ultrasonic Medical Engineering/College of Biomedical Engineering,Chongqing Medical University,Chongqing 400016,China;National Engineering Research Center of Ultrasonic Medicine,Chongqing 401121,China)
出处
《中国医学物理学杂志》
CSCD
2024年第5期554-562,共9页
Chinese Journal of Medical Physics
基金
国家自然科学基金(12204078)。
关键词
大张角双频聚焦换能器
超声激发声发射
振动声成像
空间分辨率
聚焦超声
large-angle dual-frequency focused transducer
ultrasound stimulated acoustic emission
vibro-acoustography
spatial resolution
focused ultrasound
