High-speed observation of cavitation bubble cloud structures in the focal region of a 1.2 MHz high-intensity focused ultrasound transducer
High-speed observation of cavitation bubble cloud structures in the focal region of a 1.2 MHz high-intensity focused ultrasound transducer
复制标题
高速观察 1.2 MHz 高强度聚焦超声换能器焦点区域的空化气泡云结构
DOI：
10.1016/j.ultsonch.2006.08.003
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发表时间：
2007-03-01
影响因子：
8.4
通讯作者：
Wang, Supin
中科院分区：
文献类型：
--
作者：
Chen, Hong;Li, Xiaojing;Wang, Supin
聚焦区的空泡云在HIFU的治疗应用中起着重要的作用。利用高速摄影技术研究了1.2MHz单单元凹面HIFU换能器聚焦区空化泡云的时间演化和空间分布。研究发现，在600 μ s的初始声辐照过程中，空化泡云组织成“螺旋状结构”或“帽状结构”。螺旋状结构的特征在于在HIFU换能器的几何焦点处的几乎固定的尖端，并且帽状结构的特征在于在超声传输方向上形成的凹痕。在600 μ s之后，记录到另外两种结构-“流光结构”和“簇结构”。流注结构的特征还在于在焦点处的几乎固定的底部位置，而团簇结构的特征在于焦点周围的气泡聚集。(c)2006 Elsevier B. V.保留所有权利。
Cavitation bubble clouds in the focal region of HIFU play important roles in therapeutic applications of HIFU. Temporal evolution and spatial distribution of cavitation bubble clouds generated in the focal region of a 1.2 MHz single element concave HIFU transducer in water are investigated by high-speed photography. It is found that during the initial 600 mu s insonation cavitation bubble clouds organize to the "screw-like structure" or "cap-like structure". The screw-like structure is characterized by a nearly fixed tip at the geometrical focus of the HIFU transducer, and the cap-like structure is marked by a dent formed in the direction of ultrasound transmission. After 600 mu s, another two structures are recorded - "streamer structure" and "cluster structure". The streamer structure is also featured by a nearly fixed bottom position at the focus, while the cluster structure is distinguished by agglomerations of bubbles around the focus. (c) 2006 Elsevier B.V. All rights reserved.