Publicación:
Measurement of Surface Acoustic Waves in high-frequency ultrasound: preliminary results
Measurement of Surface Acoustic Waves in high-frequency ultrasound: preliminary results
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Fecha
2017
Autores
Saavedra, AC
Zvietcovich, F
Lavarello, RJ
Castaneda, B
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Editor
Institute of Electrical and Electronics Engineers Inc.
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Abstracto
— Skin lesions change elastic properties near the
surface. In the last decades, several non-invasive elastography
techniques have been developed for detecting the mechanical
properties of tissue. In particular, harmonic elastography is
characterized for inducing shear wave propagation by an
external vibrator in order to estimate shear modulus. However, near the boundary region, propagation is governed by
surface acoustic waves (SAW). This paper combines crawling
waves elastography with a high-frequency ultrasound (HFUS)
system for the estimation of the SAW-to-shear compensation
factor when ultrasound (US) gel is used as coupling interface.
Experiments explore the SAW speed in a homogeneous phantom
with a solid-water interface in order to corroborate theoretical
findings. Subsequently, experiments in a solid-US gel interface
are conducted in order to find the correct compensation
factor. Preliminary results suggest that SAW propagation can
be detected using HFUS, and shear velocity maps can be
generated by applying the estimated empirical correction factor.
This study will potentially avoid the underestimation of shear
modulus when using SAW-based HFUS elastography which is
promising for the better diagnosis of skin diseases.
Descripción
Palabras clave
Crawling waves,
Elastography,
High-frequency ultrasound,
Shear waves