Next Article in Journal
Optimal Base Station Density of Dense Network: From the Viewpoint of Interference and Load
Next Article in Special Issue
Model-Based Real-Time Non-Rigid Tracking
Previous Article in Journal
Cross-Correlation-Based Structural System Identification Using Unmanned Aerial Vehicles
Previous Article in Special Issue
Octopus: A Design Methodology for Motion Capture Wearables
Article Menu
Issue 9 (September) cover image

Export Article

Open AccessArticle
Sensors 2017, 17(9), 2078; https://doi.org/10.3390/s17092078

Performance Study of a Torsional Wave Sensor and Cervical Tissue Characterization

1
Department of Structural Mechanics, University of Granada, 18071 Granada , Spain
2
Department of Mechanical Engineering, University College London, WC1E 7JE London, UK
3
Biosanitary Research Institute, 18012 Granada, Spain
4
Department of Applied Physics, University of Granada, 18071 Granada, Spain
*
Author to whom correspondence should be addressed.
Received: 28 July 2017 / Revised: 7 September 2017 / Accepted: 8 September 2017 / Published: 11 September 2017
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain 2017)
View Full-Text   |   Download PDF [6766 KB, uploaded 12 September 2017]   |  

Abstract

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. View Full-Text
Keywords: torsional wave sensor; tissue mimicking phantom; cervical tissue; rheological model; rheometry experiment; sensitivity study; complex shear modulus torsional wave sensor; tissue mimicking phantom; cervical tissue; rheological model; rheometry experiment; sensitivity study; complex shear modulus
Figures

Figure 1

This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
SciFeed

Share & Cite This Article

MDPI and ACS Style

Callejas, A.; Gomez, A.; Melchor, J.; Riveiro, M.; Massó, P.; Torres, J.; López-López, M.T.; Rus, G. Performance Study of a Torsional Wave Sensor and Cervical Tissue Characterization. Sensors 2017, 17, 2078.

Show more citation formats Show less citations formats

Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Related Articles

Article Metrics

Article Access Statistics

1

Comments

[Return to top]
Sensors EISSN 1424-8220 Published by MDPI AG, Basel, Switzerland RSS E-Mail Table of Contents Alert
Back to Top