TY - JOUR
T1 - High-speed observation of cavitation bubble cloud structures in the focal region of a 1.2 MHz high-intensity focused ultrasound transducer
AU - Chen, Hong
AU - Li, Xiaojing
AU - Wan, Mingxi
AU - Wang, Supin
N1 - Funding Information:
The work was supported by the National Natural Science Foundation of China (No. 30570487) and the Major Project of Science and Technology Research of Ministry of Education of China (No. 705046).
PY - 2007/3
Y1 - 2007/3
N2 - 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 μs 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 μs, 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.
AB - 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 μs 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 μs, 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.
KW - Cavitation bubble cloud structures
KW - High-intensity focused ultrasound
KW - High-speed photography
UR - http://www.scopus.com/inward/record.url?scp=33751537136&partnerID=8YFLogxK
U2 - 10.1016/j.ultsonch.2006.08.003
DO - 10.1016/j.ultsonch.2006.08.003
M3 - Article
AN - SCOPUS:33751537136
SN - 1350-4177
VL - 14
SP - 291
EP - 297
JO - Ultrasonics Sonochemistry
JF - Ultrasonics Sonochemistry
IS - 3
ER -