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| 1 | 双频激励超声造影剂微气泡差频特性的理论和实验研究显示文摘超声参量阵效应产生的差频超声由于具有较小的衰减系数,能够有效提高传播深度而实现深层组织的超声成像.本文基于RPNNP方程,对双频激励超声造影剂微气泡所产生差频信号声压进行了理论推导,并用Runge-Kutta算法进行了数值模拟,对差频信号产生的条件包括激励声压、超声频率和气泡大小等进行了优化,同时用不同参数的双频信号辐射造影剂实现差频超声激发的实验研究,理论与实验结果均表明当双频信号的频率差接近气泡的共振频率时可以大幅度提高差频信号的声压(28 d B),获得高信噪比的差频信号,本研究为双频超声激励下造影剂差频成像的实际应用提供了研究基础. | 章康宁 王佳伟 马青玉 | 2015 | 南京师大学报(自然科学版)2015，38，2： | 2 |
| 2 | The viscoelasticity of lipid shell and the hysteresis of subharmonic in liquid containing microbubbles显示文摘 | 龚燕君 章东 龚秀芬 谭开彬 刘政 | 2006 | Chinese Physics B2006，15，7： | 1 |
| 3 | Modeling of ultrasound contrast agents bubble dynamics with modified surface tension coefficient显示文摘The current work proposes a model describing the dynamics of coated microbubbles, which simplifies the traditional three-layer model to a two-layer one by introducing a visco-elastic interface with variable surface tension coefficients to connect the gas zone and the liquid zone. In the modified model, the traditional two interfaces boundary conditions are combined into one to simplify the description of the bubble. Moreover, the surface tension coefficient is defined as a function of bubble radius with lower and upper limits, which are related to the buckling and rupture mechanisms of the bubble. Further discussion is made regarding the effects resulting from the change of the surface tension coefficient on bubble dynamics. The dynamic responses of Optison and Sonozoid microbubbles, measured experimentally based on light scattering technology (adapted from previously published work), are simulated using both classic three-layer models (e.g. Church's model) and simplified model. The results show that our simplified model works as well as the Church's model. | ZHENG LuJie TU Juan CHEN WeiZhong | 2009 | Chinese Science Bulletin2009，54，19： | 1 |
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