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Journal of Medical Ultrasonics
Erschienen in:

13.09.2022 | Original Article–Physics & Engineering

Assessment of the frequency dependence of acoustic properties on material, composition, and scatterer size of the medium

verfasst von: Mai Ino, Kenji Yoshida, Shinnosuke Hirata, Kazuyo Ito, Tadashi Yamaguchi

Erschienen in: Journal of Medical Ultrasonics | Ausgabe 4/2022

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Abstract

Purpose

The aim of this study was to elucidate the frequency dependence of the speed of sound (SoS) and attenuation coefficients in phantoms with controlled attenuation properties (scatterer density, scatterer size, absorption control material) and rat livers.

Methods

The frequency dependence of SoS and attenuation coefficients were evaluated with ultrasound (1–15 MHz) by observing multiple phantoms with different scatterer sizes, densities, and presence or absence of evaporated milk as absorbing media. Normal and fatty model rat livers were examined with the same protocol.

Results

The phantom results revealed that the scatterer density and SoS of the base media were the dominant factors causing the changes in SoS. Frequency dependence was not observed in SoS. Assessment of the attenuation coefficient showed that the frequency dependence was mainly affected by absorption attenuation when the scatterer was as small as a hepatocyte (i.e. ≤ 10 µm). Scattering attenuation was also observed to affect frequency dependence when the scatterer was as large as lipid droplets (i.e. ≤ 40 µm).

Conclusion

Assuming a consistent size of the main scatterers in the evaluation medium, the frequency dependence of the SoS and attenuation coefficients may provide insight into the scatterer density and the contribution of absorption and scattering attenuation. Further studies in the higher frequency band (up to about 50 MHz) are expected to advance the clinical application of high-frequency ultrasound.
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Metadaten
Titel
Assessment of the frequency dependence of acoustic properties on material, composition, and scatterer size of the medium
verfasst von
Mai Ino
Kenji Yoshida
Shinnosuke Hirata
Kazuyo Ito
Tadashi Yamaguchi
Publikationsdatum
13.09.2022
Verlag
Springer Nature Singapore
Erschienen in
Journal of Medical Ultrasonics / Ausgabe 4/2022
Print ISSN: 1346-4523
Elektronische ISSN: 1613-2254
DOI
https://doi.org/10.1007/s10396-022-01235-1

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