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The effect of pleural fluid layers on lung surface wave speed measurement: Experimental and numerical studies on a sponge lung phantom.
Journal of the Mechanical Behavior of Biomedical Materials ( IF 3.9 ) Pub Date : 2018-09-06 , DOI: 10.1016/j.jmbbm.2018.09.007
Boran Zhou 1 , Xiaoming Zhang 1
Affiliation  

Pleural effusion manifests as compression of pleural fluid on the lung parenchyma contributing to hypoxemia. Medical procedures such as drainage of plural fluid releases this compression and increases oxygenation. However, the effect of pleural effusion on the elasticity of lung parenchyma is unknown. By using lung ultrasound surface wave elastography (LUSWE) and finite element method (FEM), the effect of pleural effusion on the elasticity of superficial lung parenchyma in terms of surface wave speed measurement was evaluated in a sponge phantom study. Different thicknesses of ultrasound transmission gel used to simulated pleural fluid were inserted into a condom, which was placed between the sponge and standoff pad. A mechanical shaker was used to generate vibration on the sponge phantom at different frequencies ranging from 100 to 300 Hz while the ultrasound transducer was used to capture the motion for measurement of surface wave speed of the sponge. FEM was conducted based on the experimental setup and numerically assessed the influence of pleural effusion on the surface wave speed of the sponge. We found from FEM experiments that the influence of thickness of ultrasound transmission gel was statistically insignificant on the surface wave speed of the sponge at 100 and 150 Hz.



中文翻译:

胸膜液层对肺表面波速度测量的影响:海绵肺体模的实验和数值研究。

胸腔积液表现为肺实质内胸液受压,导致低氧血症。诸如排出多种液体之类的医疗程序会释放这种压缩并增加氧合作用。然而,胸腔积液对肺实质的弹性影响尚不清楚。在海绵体模研究中,通过使用肺部超声表面波弹性成像(LUSWE)和有限元方法(FEM),从表面波速度测量的角度评估了胸腔积液对浅表肺实质的弹性的影响。将用于模拟胸膜液的不同厚度的超声传输凝胶插入安全套中,该安全套放置在海绵和支脚垫之间。使用机械振动器在海绵体模上以100到300 Hz的不同频率产生振动,而使用超声换能器捕获运动以测量海绵的表面波速。在实验装置的基础上进行了有限元分析,并在数值上评估了胸腔积液对海绵表面波速的影响。从FEM实验中我们发现,超声透射凝胶的厚度对海绵在100和150 Hz处的表面波速的影响在统计学上不显着。

更新日期:2018-09-06
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