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Appl. Sci. 2016, 6(11), 310;

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

Department of Biomedical Engineering, University of Texas at Austin, Austin, TX 78712, USA
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)
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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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