Performance Study of a Torsional Wave Sensor and Cervical Tissue Characterization.
Performance Study of a Torsional Wave Sensor and Cervical Tissue Characterization.
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DOI：
10.3390/s17092078
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发表时间：
2017-09-11
期刊：
影响因子：
--
通讯作者：
Rus G
中科院分区：
文献类型：
--
作者：
Callejas A;Gomez A;Melchor J;Riveiro M;Massó P;Torres J;López-López MT;Rus G
提出了一种用于软组织力学特性测量的新型扭波传感器。自20世纪90年代以来，弹性成像是一种广泛使用的技术，用于映射组织硬度。此外，定量弹性成像使用剪切波的速度来实现剪切刚度。由于纵波和横波分离困难以及测量时施加的压力，这种技术表现出明显的局限性。为了克服这些缺点，所提出的扭转波传感器可以隔离纯剪切波，避免多波干扰的可能性。它包括旋转致动器盘和周向对齐的压电陶瓷接收器环。两者都允许在被接收之前与组织相互作用的剪切波的传输。使用组织模拟体模和宫颈组织进行实验测试。一个贡献是传感器的灵敏度研究，已进行评估的鲁棒性的新提出的扭转波弹性成像（TWE）技术。研究的变量对象是所施加的压力和入射角传感器体模。另一个贡献包括宫颈组织定征。为此，三个流变模型拟合的实验数据和静态独立测试方法已被执行。所提出的方法允许从传播的剪切波的力学常数的重建，提供了一个证明的原则和prompting进一步的研究，以确认结果的有效性。
A novel torsional wave sensor designed to characterize mechanical properties of soft tissues is presented in this work. Elastography is a widely used technique since the 1990s to map tissue stiffness. Moreover, quantitative elastography uses the velocity of shear waves to achieve the shear stiffness. This technique exhibits significant limitations caused by the difficulty of the separation between longitudinal and shear waves and the pressure applied while measuring. To overcome these drawbacks, the proposed torsional wave sensor can isolate a pure shear wave, avoiding the possibility of multiple wave interference. It comprises a rotational actuator disk and a piezoceramic receiver ring circumferentially aligned. Both allow the transmission of shear waves that interact with the tissue before being received. Experimental tests are performed using tissue mimicking phantoms and cervical tissues. One contribution is a sensor sensitivity study that has been conducted to evaluate the robustness of the new proposed torsional wave elastography (TWE) technique. The variables object of the study are both the applied pressure and the angle of incidence sensor–phantom. The other contribution consists of a cervical tissue characterization. To this end, three rheological models have fit the experimental data and a static independent testing method has been performed. The proposed methodology permits the reconstruction of the mechanical constants from the propagated shear wave, providing a proof of principle and warranting further studies to confirm the validity of the results.
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