Investigating Relationship Between Lateral Time-To-Peak (TTP) Displacement Curves and Stiffness of Viscoelastic Agar-Gelatin Phantoms

2019 International Conference on Innovative Trends in Computer Engineering (ITCE) Pub Date : 2019-02-01 DOI:10.1109/ITCE.2019.8646388

H. M. Ahmed, N. Salem, A. Seddik, M. El-Adawy

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引用次数: 1

Abstract

Shear wave speed is a metric for the tissue elastic properties and its pathologic changes. This is due to the implicit relationship between the speed of the propagating shear wave within tissue and both its elastic properties and pathologic changes. Wave propagation is a result of a force applied transiently to the tissue model. In this paper, the relationship between lateral TTP displacement curves and stiffness of different Young’s moduli phantoms is investigated. Five different elastic moduli Finite Element Models (FEMs) are used; 5.2KPa, 9.8KPa, 23.9KPa, 44.2KPa and 67.3KPa. Agar-gelatin model is used as a general model for mimicking soft tissue. Displacements are tracked with respect to the simulation time to create the displacement magnitude profile for the central node for each phantom. Results have shown that the second highest peak happens after 0.05 seconds in case of low elastic moduli FEMs. This time stamp can be used as a yardstick to differentiate between low and high elastic moduli without considering estimating the shear wave speed for many lateral nodes.

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研究粘弹性琼脂-明胶模型横向峰值时间(TTP)位移曲线与刚度的关系

横波速度是衡量组织弹性特性及其病理变化的指标。这是由于组织内传播剪切波的速度与其弹性特性和病理变化之间的隐含关系。波的传播是在组织模型上施加瞬时力的结果。本文研究了不同杨氏模体的侧向TTP位移曲线与刚度之间的关系。采用了五种不同的弹性模量有限元模型;5.2KPa、9.8KPa、23.9KPa、44.2KPa、67.3KPa。琼脂-明胶模型被用作模拟软组织的通用模型。根据模拟时间跟踪位移，为每个幻像的中心节点创建位移大小剖面。结果表明，低弹性模量有限元模型的第二峰值出现在0.05 s之后。该时间戳可以用作区分高、低弹性模量的尺度，而无需考虑估计许多侧节点的横波速度。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 International Conference on Innovative Trends in Computer Engineering (ITCE)

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