基于物体与环境刚度差模量的横波弹性评估新准则。

IF 1.1 Q4 MEDICINE, RESEARCH & EXPERIMENTAL
I Yu Demin, P I Rykhtik, А E Spivak, D V Safonov
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引用次数: 0

摘要

超声剪切波弹性成像是一种基于测量剪切波速的现代方法,它可以确定软生物组织在任意点的刚度(点弹性成像),或者构建一个二维彩色图像,随后进行刚度的点测量(二维弹性成像),从而比较物体与介质或物体之间的刚度。研究的目的是建立一个新的标准来比较评估具有不同刚度的物体在横波弹性测量中:物体与环境之间的刚度差模量。材料和方法:采用原始的二维彩色弹性图构建技术,利用商用超声扫描仪上的线性传感器进行点弹性图和二维横波弹性图的绘制;Aixplorer(法国SuperSonic Imagine公司)、Acuson S2000(德国西门子公司)和Verasonics声学系统(美国Verasonics公司)采用开放式架构来确定焦点内含物的刚度值,并借助一种新的比较弹性体评估标准:物体和环境之间的刚度差模量来相互比较。首先,在已知各种内含物刚度的校准后的弹性QA幻影049型(美国计算机成像参考系统公司)和未知内含物刚度的未校准BP1901幻影(美国蓝色幻影)上比较了被测扫描仪的精度。将所得值进行比较,确定主观因素对测量结果的影响。结果:为了评估焦点的刚度并在考虑环境刚度的情况下进行数值比较,提出了一种新的比较评价标准——焦点与环境刚度差模量,该模量定量表征了焦点与环境刚度差值之间的差异。根据这一标准,所有三种超声扫描仪都已建立,在确定均匀介质中在幽灵实验中包裹体的刚度方面显示出高的和相当的准确性。二维横波弹性成像揭示了控制体积大小和色阶设置的正确性对弹性测量结果的影响,特别是在非均匀物体中。还提出了减少主观因素影响的方法技术。结论:研究表明,在考虑环境刚度的情况下,将物体与环境的刚度差模量作为横波弹性测量中物体比较评价的新准则是可能的。为了减少对操作者的依赖,有必要考虑实现弹性测量的方式(点或二维彩色弹性成像)和许多其他方法因素。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

A New Criterion for Shear Wave Elastometric Assessment Using Modulus of Stiffness Difference between Object and Environment.

A New Criterion for Shear Wave Elastometric Assessment Using Modulus of Stiffness Difference between Object and Environment.

A New Criterion for Shear Wave Elastometric Assessment Using Modulus of Stiffness Difference between Object and Environment.

A New Criterion for Shear Wave Elastometric Assessment Using Modulus of Stiffness Difference between Object and Environment.

Ultrasound shear wave elastography is a modern method that is based on measuring the shear wave velocity making it possible to determine stiffness of soft biological tissues at an arbitrary point (point elastography) or to construct a two-dimensional color image with a subsequent point measurement of stiffness (two-dimensional elastography) and therefore to compare the stiffness of an object with a medium or objects with each other. The aim of the study is to develop a new criterion for the comparative assessment of objects with different stiffness during shear wave elastometry: modulus of stiffness difference between object and environment.

Materials and methods: Using the original technology of building two-dimensional color elastogram, point and two-dimensional shear wave elastography were performed using linear sensors on commercial ultrasound scanners: Aixplorer (SuperSonic Imagine, France), Acuson S2000 (Siemens, Germany), and Verasonics acoustic system (Verasonics Inc., USA) with an open architecture to determine the stiffness values of focal inclusions and compare them with each other with the help of a new comparative elastomeric assessment criterion: modulus of stiffness difference between object and environment. First, the accuracy of the scanners under test was compared on a calibrated Elasticity QA Phantom, model 049 (Computerized Imaging Reference Systems Company, USA) with a known stiffness of various inclusions and thereafter on an uncalibrated BP1901 phantom (Blue Phantom, USA) with unknown stiffness of inclusions. The obtained values were compared to determine the influence of subjective factors on the measurement results.

Results: To assess the stiffness of the foci and compare the values with each other taking into account the rigidity of the environment, it is proposed to use a new criterion for the comparative assessment - the modulus of stiffness difference between focus and environment, which quantitatively characterizes the difference between these values. According to this criterion, all three ultrasound scanners have been established to show high and comparable accuracy in determining the stiffness of inclusions within the homogeneous medium in the experiments on phantoms. Two-dimensional shear wave elastography has revealed the effect of the control volume size and the correctness of the color scale setting, especially in the heterogeneous objects, on the results of elastometry. Methodological techniques to reduce the influence of subjective factors have also been proposed.

Conclusion: The study has showed the possibility of using the modulus of stiffness difference between object and environment as a new criterion for comparative assessment of objects in shear wave elastometry taking into account stiffness of the environment. To reduce operator-dependence, it is necessary to take into consideration both the way of realizing elastometry (point or two-dimensional color elastography) and a number of other methodological factors.

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来源期刊
Sovremennye Tehnologii v Medicine
Sovremennye Tehnologii v Medicine MEDICINE, RESEARCH & EXPERIMENTAL-
CiteScore
1.80
自引率
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发文量
38
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