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Efficient Transmit Delay Calculation in Ultrasound Coherent Plane-Wave Compound Imaging for Curved Array Transducers

1
Department of Electronic Engineering, Sogang University, Seoul 04107, Korea
2
Department of Biomedical Engineering, Sogang University, Seoul 04107, Korea
*
Author to whom correspondence should be addressed.
Appl. Sci. 2019, 9(13), 2752; https://doi.org/10.3390/app9132752
Received: 11 March 2019 / Revised: 21 June 2019 / Accepted: 4 July 2019 / Published: 8 July 2019
(This article belongs to the Special Issue Advanced Ultrasound Technology for Medical Application)
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Abstract

The recently introduced plane-wave compounding method based on multiple plane-wave excitation has enabled several new applications due to its high frame rate (>1000 Hz). In this paper, a new efficient transmit delay calculation method in plane-wave compound imaging for a curved array transducer is presented. In the proposed method, the transmit delay is only calculated for a steering angle of 0° and is shifted along the element of the transducer to obtain other transmit delays for different steering angles. To evaluate the performance of the proposed method, the computational complexity was measured for various transmission conditions. For the number of elements and plane-wave excitations of 128 and 65, respectively, the number of operations was substantially decreased in the proposed method compared with the conventional method (256 vs. 8320). The benefits of the proposed method were demonstrated with phantom and in vivo experiments, where coherent plane-wave compounding with 65 excitations provided larger CR and CNR values compared to nine excitations (−22.5 dB and 2.7 vs. −11.3 dB and 1.9, respectively). These results indicate the proposed method can effectively reduce the computational complexity for plane-wave compound imaging in curved array transducers. View Full-Text
Keywords: ultrafast ultrasound imaging; plane-wave compounding; curved array transducer; transmit delay ultrafast ultrasound imaging; plane-wave compounding; curved array transducer; transmit delay
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Go, D.; Kang, J.; Song, I.; Yoo, Y. Efficient Transmit Delay Calculation in Ultrasound Coherent Plane-Wave Compound Imaging for Curved Array Transducers. Appl. Sci. 2019, 9, 2752.

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