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Appl. Sci. 2016, 6(11), 310; doi:10.3390/app6110310

Numerical Analysis on Cross-Shaped Array with Dynamic Transmit Focusing for Enhanced Volumetric Ultrasound Imaging

1
Department of Biomedical Engineering, University of Texas at Austin, Austin, TX 78712, USA
2
Department of Biomedical Engineering and Center for Marine-Integrated Biomedical Technology (BK 21 Plus), Pukyong National University, Busan 48513, Korea
*
Author to whom correspondence should be addressed.
Academic Editor: Kohji Masuda
Received: 21 July 2016 / Revised: 17 October 2016 / Accepted: 19 October 2016 / Published: 25 October 2016
(This article belongs to the Special Issue Biomedical Ultrasound)
View Full-Text   |   Download PDF [2216 KB, uploaded 1 November 2016]   |  

Abstract

Volumetric ultrasound imaging has been primarily used as a clinical tool to diagnose cardiac dysfunction. However, the modality still suffers from system complexity due to a large number of receive channels for volumetric reconstruction. The aim of the study was to numerically assess a cross-shaped sparse array with a dynamic transmit focusing method to reduce the system complexity and to compensate for the image quality of unfocused volumetric imaging. Analytical simulations with two-way point spread functions demonstrated that the cross-shaped sparse array entailed up to an 84% increase in side-lobes (up to 32 dB), thus leading to significant degradation of the point spread function in the diagonal plane. A dynamic transmit focusing method was able to vividly overcome the image degradation by transmitting more beams with tilting angles. This also yielded a comparable image sensitivity (65 dB) to that of the full array when 31 × 31 tilted waves were used. The proposed cross-shaped sparse array with the dynamic transit focusing method can be used to enhance the frame rate as well as the image quality for unfocused ultrasound imaging. View Full-Text
Keywords: sparse array; point spread function; dynamic transmit focusing sparse array; point spread function; dynamic transmit focusing
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Park, S.; Kang, H.W. Numerical Analysis on Cross-Shaped Array with Dynamic Transmit Focusing for Enhanced Volumetric Ultrasound Imaging. Appl. Sci. 2016, 6, 310.

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