Improvements on USCT SAFT imaging by divergence compensation

Diego Armando Cardona Cardenas; Sergio Shiguemi Furuie

doi:10.1117/12.2549799

16 March 2020 Improvements on USCT SAFT imaging by divergence compensation

Diego Armando Cardona Cardenas, Sergio Shiguemi Furuie

Author Affiliations +

Proceedings Volume 11319, Medical Imaging 2020: Ultrasonic Imaging and Tomography; 1131911 (2020) https://doi.org/10.1117/12.2549799
Event: SPIE Medical Imaging, 2020, Houston, Texas, United States

Abstract

The use of Synthetic Aperture Focusing Technique (SAFT) for reflectivity ultrasound tomography has limita- tions due to the low signal-to-noise ratio. To overcome this fact in reflectivity ultrasound tomography, some studies have been showing improvements, propounding to take advantage of ultrasound transmission phenom- ena. Nevertheless, they do not take into account the characteristic divergence of ultrasound propagation. To contribute to a solution, we propose an improvement called weighted-SAFT, and test it with simulated media. In this study, the following were used: k-Wave toolbox for data generation on heterogeneous medium (sound speed, density, and attenuation); numerical phantoms with different combination, size, geometry, and location of the simulated objects; Fast Marching Method for phase aberration correction and time of flight, based on Refraction tomography, to calculated the SAFT weighting. The data set was generated using 192 simulated single-element transducers (1 MHz) uniformly distributed along the perimeter of a circular area. The SAFT reconstructions were made using the raw received signal and, separately, the envelope of the signal. SAFT-reconstructions using the signal envelope shows a diffuse appearance, and the edges of the objects in these regions can not be delimited. It is observed how the weighting SAFT leads to a more balanced distribution of intensity values throughout the image, partially compensating the ultrasound divergence effect and improving the image contrast.

Citation Download Citation

Diego Armando Cardona Cardenas and Sergio Shiguemi Furuie "Improvements on USCT SAFT imaging by divergence compensation", Proc. SPIE 11319, Medical Imaging 2020: Ultrasonic Imaging and Tomography, 1131911 (16 March 2020); https://doi.org/10.1117/12.2549799

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KEYWORDS

Transducers

Ultrasonography

Computer simulations

Reflectivity

Ultrasound tomography

Signal attenuation

Refraction

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