2017
DOI: 10.3390/s17061402
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Torsional Ultrasound Sensor Optimization for Soft Tissue Characterization

Abstract: Torsion mechanical waves have the capability to characterize shear stiffness moduli of soft tissue. Under this hypothesis, a computational methodology is proposed to design and optimize a piezoelectrics-based transmitter and receiver to generate and measure the response of torsional ultrasonic waves. The procedure employed is divided into two steps: (i) a finite element method (FEM) is developed to obtain a transmitted and received waveform as well as a resonance frequency of a previous geometry validated with… Show more

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Cited by 15 publications
(13 citation statements)
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“…To respond to the principles of an optimal design of a torsional wave sensor considering the extraction of biomechanical properties, it is necessary to compute Finite Element Models (FEM) as a first step [ 15 , 29 , 30 ]. Thus, the resonant frequency can be determined for torsional waves for the emitter and the receiver using Finite Element Analysis Program (FEAP) software [ 31 ].…”
Section: Methodsmentioning
confidence: 99%
“…To respond to the principles of an optimal design of a torsional wave sensor considering the extraction of biomechanical properties, it is necessary to compute Finite Element Models (FEM) as a first step [ 15 , 29 , 30 ]. Thus, the resonant frequency can be determined for torsional waves for the emitter and the receiver using Finite Element Analysis Program (FEAP) software [ 31 ].…”
Section: Methodsmentioning
confidence: 99%
“…It is an ambitious goal, yet we have obtained promising results and the technique is being validated through this work and recent work of the group. Torsional wave elastography has been shown to be effective in obtaining biomechanical biomarkers [21,[25][26][27]43].…”
Section: Discussionmentioning
confidence: 99%
“…Dealing with this type of geometry is a challenge for current elastography approaches in small organs such as the uterine cervix, where SWE would generate bounces on the tissue walls and mask the signal received by the receiver. However, TWE technique generates less energy that does not generate rebounds [26]. Torsional waves propagate both radially and in depth, which is very advantageous in the case of multilayer tissue.…”
Section: Discussionmentioning
confidence: 99%
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“…If two materials with different elasticities (for instance of twice Young’s modulus) are compared in terms of their stiffness and compliance (its inverse), different distances are obtained. Since there is no reason to prefer one over the other, the definition of their distance should be independent of the choice, which can be attained through a logarithmic change of variable [ 30 , 31 ]. This change of variables is completed with a mapping from to a predefined range of physically reasonable values , to improve numerical stability, as, …”
Section: Methodsmentioning
confidence: 99%