@misc{10481/82855,
year = {2023},
url = {https://hdl.handle.net/10481/82855},
abstract = {The propagation of shear waves in elastography at high frequency (>3 kHz) in viscoelastic media has not been
extensively studied due to the high attenuation and technical limitations of current techniques. An optical
micro-elastography (OME) technique using magnetic excitation for generating and tracking high frequency
shear waves with enough spatial and temporal resolution was proposed. Ultrasonics shear waves (above 20
kHz) were generated and observed in polyacrylamide samples. A cutoff frequency, from where the waves
no longer propagate, was observed to vary depending on the mechanical properties of the samples. The
ability of the Kelvin–Voigt (KV) model to explain the high cutoff frequency was investigated. Two alternative
measurement techniques, Dynamic Mechanical Analysis (DMA) and Shear Wave Elastography (SWE), were used
to complete the whole frequency range of the velocity dispersion curve while avoid capturing guided waves in
the low frequency range (<3 kHz). The combination of the three measurement techniques provided rheology
information from quasi-static to ultrasonic frequency range. A key observation was that the full frequency
range of the dispersion curve was necessary if one wanted to infer accurate physical parameters from the
rheological model. By comparing the low frequency range with the high frequency range, the relative errors
for the viscosity parameter could reach 60 % and they could be higher with higher dispersive behavior. The
high cutoff frequency may be predicted in materials that follow a KV model over their entire measurable
frequency range. The mechanical characterization of cell culture media could benefit from the proposed OME
technique.},
organization = {Ministerio de Educación, Cultura
y Deporte, Spain grant numbers DPI2017-83859-R, and EQC2018-
004508-P},
organization = {Ministerio de Ciencia e Innovación, Spain grant numbers
PID2020-115372RB-I00, PYC20 RE 072 UGR},
organization = {Ministerio de Sanidad,
Servicios Sociales e Igualdad, Spain grant numbers DTS15/00093},
organization = {PI16/00339; Instituto de Salud Carlos III},
organization = {Fondos Feder, Spain; Junta
de Andalucía},
organization = {Spain grant numbers PI-0107-2017},
organization = {PIN-0030-2017},
organization = {IE2017-5537; P21-00182},
organization = {Consejería de Universidad, Investigación e
Innovación de la Junta de Andalucía},
organization = {MCIN/AEI 10.13039/501100011
033 grant number PRE2018-086085 (Co-funded by European Social
Fund ‘‘Investing in your future’’)},
organization = {European Regional Development Fund
(ERDF) SOMM17/6109/UGR},
organization = {B-TEP-026},
organization = {IE2017-5537},
organization = {P18-RT-
1653},
publisher = {Elsevier},
keywords = {Optical elastography},
keywords = {Magnetism},
keywords = {High frequency},
keywords = {Rheological modeling},
keywords = {Kelvin-Voigt model},
title = {Optical micro-elastography with magnetic excitation for high frequency rheological characterization of soft media},
doi = {10.1016/j.ultras.2023.107021]},
author = {Torres Pérez, Jorge and Callejas Zafra, Antonio Manuel and Gómez Fernández, Antonio Jesús and Rus Carlborg, Guillermo},
}