Molecular structure dependence of acoustic nonlinearity parameter B/A for silicone oils

作者：Zhang Zhe; Chen Gong; Zhang Dong^*

来源：Chinese Physics B, 2014, 23(5): 054302.

DOI：10.1088/1674-1056/23/5/054302

• acoustic nonlinearity parameter
• molecular structure
• modified thermodynamic method
• silicone oil

Exploring new acoustic parameters is essential to develop a noninvasive imaging technique for the surgery of silicone oil tamponades. In this study, the acoustic nonlinearity parameters B/A of varied silicone oil samples (e.g., linear or hyper-branched) are experimentally measured by using a modified thermodynamic method. The results show that: (i) when the concentration of the silicone oil with a molecular weight of 5 x 10(4) increases from 0.5 g/100 ml to 8 g/100 ml, the corresponding B/A value increases by about 18%, but the acoustic velocity only increases by about 0.1%; (ii) when the molecular weight of the hyper-branched silicone oil is enhanced from 2 x 10(5) to 1 x 10(6), the B/A value increases by about 22%, while the acoustic velocity is only raised by about 0.2%. This study suggests that the B/A parameter of the silicone oil is more sensitive to the change in its molecular structure than that of the acoustic velocity. Thus, the B/A parameter might be utilized as an effective index for the development and optimization of the noninvasive imaging of the surgery of silicone oil tamponades.

• 出版日期2014-5
• 单位南京大学; 江苏省中医院