中国物理B ›› 2012, Vol. 21 ›› Issue (7): 74301-074301.doi: 10.1088/1674-1056/21/7/074301
• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇 下一篇
崔炜程a, 屠娟a, Hwang Joo-Hab, 李倩a, 范庭波a, 章东a, 陈静海c, 陈伟中a
Cui Wei-Cheng(崔炜程)a), Tu Juan(屠娟) a)†, Hwang Joo-Hab), Li Qian (李倩)a), Fan Ting-Bo(范庭波)a), Zhang Dong(章东)a), Chen Jing-Hai(陈静海)c), and Chen Wei-Zhong(陈伟中)a)
摘要: Hyperthermia effects (39--44 ℃) induced by pulsed high-intensity focused ultrasound (HIFU) have been regarded as a promising therapeutic tool for boosting immune responses or enhancing drug delivery into solid tumor. However, previous studies also reported that the cell death occurs when cells are maintained at 43 ℃ for more than 20 minutes. The aim of this study is to investigate thermal responses inside in vivo rabbit auricular veins exposed to pulsed HIFU (1.17 MHz, 5300 W/cm2, with relatively low-duty ratios (0.2%--4.3%). The results show that: (1) with constant pulse repetition frequency (PRF) (e.g., 1 Hz), the thermal responses inside the vessel will increase with the increasing duty ratio; (2) a temperature elevation to 43 ℃ can be identified at the duty ratio of 4.3%; (3) with constant duty ratios, the change of PRF will not significantly affect the temperature measurement in the vessel; (4) as the duty ratios lower than 4.3%, the presence of microbubbles will not significantly enhance the thermal responses in the vessel, but will facilitate HIFU-induced inertial cavitation events.
中图分类号: (Nonlinear acoustics)