Experimental Evidence of Generation and Reception by a Transluminal Axisymmetric Shear Wave Elastography Prototype
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AuthorHurtado Estevez, Manuel; Callejas Zafra, Antonio Manuel; Torres, Jorge; Rus Carlborg, Guillermo
Shear Wave Elastography ImagingTransluminal elastographyPhantomsProstate
Gomez, A.; Hurtado, M.; Callejas, A.; Torres, J.; Saffari, N.; Rus, G. Experimental Evidence of Generation and Reception by a Transluminal Axisymmetric Shear Wave Elastography Prototype. Diagnostics 2021, 11, 645. https:// doi.org/10.3390/diagnostics11040645
SponsorshipMinistry of Education grant numbers EQC2018-004508- P, DPI2017-83859-R, and UNGR15-CE-3664; Ministry of Health grant numbers DTS15/00093 and PI16/00339, and Junta de Andalucía grant numbers, PI-0107-2017 and PIN-0030-2017, and B-TEP-026- UGR18, IE2017-5537, P18-RT-1653 (Junta de Andalucía); Consejería de Economía, Conocimiento, Empresas y Universidad; European Regional Development Fund (ERDF) SOMM17/6109/UGR
Experimental evidence on testing a non-ultrasonic-based probe for a new approach in transluminal elastography was presented. The proposed modality generated shear waves by inducing oscillatory rotation on the lumen wall. Detection of the propagated waves was achieved at a set of receivers in mechanical contact with the lumen wall. The excitation element of the probe was an electromagnetic rotational actuator whilst the sensing element was comprised by a uniform anglewise arrangement of four piezoelectric receivers. The prototype was tested in two soft-tissue-mimicking phantoms that contained lumenlike conduits and stiffer inclusions. The shear wave speed of the different components of the phantoms was characterized using shear wave elastography. These values were used to estimate the time-of-flight of the expected reflections. Ultrafast ultrasound imaging, based on Loupas’ algorithm, was used to estimate the displacement field in transversal planes to the lumenlike conduit and to compare against the readouts from the transluminal transmission–reception tests. Experimental observations between ultrafast imaging and the transluminal probe were in good agreement, and reflections due to the stiffer inclusions were detected by the transluminal probe. The obtained experimental evidence provided proof-of-concept for the transluminal elastography probe and encouraged further exploration of clinical applications.