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Article

Quasi-Static Elastography and Ultrasound Plane-Wave Imaging: The Effect of Beam-Forming Strategies on the Accuracy of Displacement Estimations

1
Medical UltraSound Imaging Center, Department of Radiology and Nuclear Medicine, Radboud University Medical Center, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands
2
Physics of Fluids Group, MIRA, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(3), 319; https://doi.org/10.3390/app8030319
Received: 22 December 2017 / Revised: 15 February 2018 / Accepted: 17 February 2018 / Published: 26 February 2018
(This article belongs to the Special Issue Ultrafast Ultrasound Imaging)
Quasi-static elastography is an ultrasound method which is widely used to assess displacements and strain in tissue by correlating ultrasound data at different levels of deformation. Ultrafast plane-wave imaging allows us to obtain ultrasound data at frame rates over 10 kHz, permitting the quantification and visualization of fast deformations. Currently, mainly three beam-forming strategies are used to reconstruct radio frequency (RF) data from plane-wave acquisitions: delay-and-sum (DaS), and Lu’s-fk and Stolt’s-fk operating in the temporal-spatial and Fourier spaces, respectively. However, the effect of these strategies on elastography is unknown. This study investigates the effect of these beam-forming strategies on the accuracy of displacement estimation in four transducers (L7-4, 12L4VF, L12-5, MS250) for various reconstruction line densities and apodization/filtering settings. A method was developed to assess the accuracy experimentally using displacement gradients obtained in a rotating phantom. A line density with multiple lines per pitch resulted in increased accuracy compared to one line per pitch for all transducers and strategies. The impact on displacement accuracy of apodization/filtering varied per transducer. Overall, Lu’s-fk beam-forming resulted in the most accurate displacement estimates. Although DaS in some cases provided similar results, Lu’s-fk is more computationally efficient, leading to the conclusion that Lu’s-fk is most optimal for plane wave ultrasound-based elastography. View Full-Text
Keywords: quasi-static; elastography; ultrasound; beam-forming; delay-and-sum; Stolt’s; Lu’s; displacements; apodization; lateral displacement; axial displacement quasi-static; elastography; ultrasound; beam-forming; delay-and-sum; Stolt’s; Lu’s; displacements; apodization; lateral displacement; axial displacement
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MDPI and ACS Style

Hendriks, G.A.G.M.; Chen, C.; Hansen, H.H.G.; De Korte, C.L. Quasi-Static Elastography and Ultrasound Plane-Wave Imaging: The Effect of Beam-Forming Strategies on the Accuracy of Displacement Estimations. Appl. Sci. 2018, 8, 319. https://doi.org/10.3390/app8030319

AMA Style

Hendriks GAGM, Chen C, Hansen HHG, De Korte CL. Quasi-Static Elastography and Ultrasound Plane-Wave Imaging: The Effect of Beam-Forming Strategies on the Accuracy of Displacement Estimations. Applied Sciences. 2018; 8(3):319. https://doi.org/10.3390/app8030319

Chicago/Turabian Style

Hendriks, Gijs A.G.M., Chuan Chen, Hendrik H.G. Hansen, and Chris L. De Korte. 2018. "Quasi-Static Elastography and Ultrasound Plane-Wave Imaging: The Effect of Beam-Forming Strategies on the Accuracy of Displacement Estimations" Applied Sciences 8, no. 3: 319. https://doi.org/10.3390/app8030319

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