Mr. Aldo Tecse Profile

Aldo Tecse

at Pontificia Univ Católica del Perú

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Proceedings Article | 3 November 2020 Paper

Bidimensional analysis of reverberant shear wave elastography with multiple aleatory mini-surface sources: simulation study

Aldo Tecse, Stefano Romero, Gilmer Flores, Benjamin Castaneda

Proceedings Volume 11583, 115830V (2020) https://doi.org/10.1117/12.2579774

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Reverberant shear wave elastography (R-SWE) is a novel technique that takes advantage of reflected waves, applying multiple vibration sources near the region of interest, in order to create a diffuse field. Different studies show encouraging results assuming a full development of the desired field. However, the presence of the optimal diffuse field it is not guaranteed. Moreover, previous studies have performed numerical simulations and phantom experiments, considering the reverberant field generation through the summation of plane shear waves propagating with random amplitude, direction and phase. In contrast, these assumption is not accurate, since physical experiments could be performed using normal load sources with a reduce contact surface, propagating spherical shear waves. This work is based on a simulation study with four different scenarios with aleatory mini-surface sources considering their position, degree of similarity with theoretical models and shear wave speed (SWS) estimation. The results suggest that similar SWS maps can be reconstructed independently of the range of sources used. Furthermore, there is a significant bias (around 25%) for SWS estimation obtained by curve fitting estimation since this technique is optimized for plane waves.

Proceedings Article | 3 January 2020 Paper

Validation of high-frequency ultrasound crawling waves sonoelastography

Aldo Tecse, Stefano Romero, Ana Saavedra, Benjamin Castaneda

Proceedings Volume 11330, 113300V (2020) https://doi.org/10.1117/12.2542609

KEYWORDS: Ultrasonography, Skin, Elastography, Melanoma, Signal attenuation

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Skin diseases cause changes in the elasticity of the skin. Recently, a new ultrasound method which combines crawling waves elastography with a high-frequency ultrasound (HF-US) system was reported for the estimation of skin elasticity. This study applies crawling waves method with an HF-US system in homogeneous and heterogeneous phantoms with similar shear wave speeds found in the literature to validate this technique. In addition, estimation performance was compared between the Phase Derivative (PD) estimator and the Regularized Wave- length Average Velocity Estimator (R-WAVE). Results corroborate the feasibility of this method. Additionally, it suggests that R-WAVE estimator can provide better measurements than PD with a lower coefficient of variation and fewer artifacts.

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