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Iterative 2D Tissue Motion Tracking in Ultrafast Ultrasound Imaging

1
Department of Biomedical Engineering, Faculty of Engineering, Lund University, 221 00 Lund, Sweden
2
Graduate School of Science and Engineering for Research, University of Toyama, Toyama 930-8555, Japan
3
Department of Information Engineering, University of Florence, 501 39 Florence, Italy
4
Laboratory of Cardiovascular Imaging and Dynamics, Department of Cardiovascular Sciences, KU Leuven, 3000 Leuven, Belgium
5
Department of Translational Medicine, Lund University, 221 00 Lund, Sweden
6
Department of Medical Imaging and Physiology, Skåne University Hospital, Lund University, 205 02 Malmö, Sweden
*
Author to whom correspondence should be addressed.
Appl. Sci. 2018, 8(5), 662; https://doi.org/10.3390/app8050662
Received: 7 March 2018 / Revised: 17 April 2018 / Accepted: 21 April 2018 / Published: 25 April 2018
(This article belongs to the Special Issue Ultrafast Ultrasound Imaging)
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Abstract

In order to study longitudinal movement and intramural shearing of the arterial wall with a Lagrangian viewpoint using ultrafast ultrasound imaging, a new tracking scheme is required. We propose the use of an iterative tracking scheme based on temporary down-sampling of the frame-rate, anteroposterior tracking, and unbiased block-matching using two kernels per position estimate. The tracking scheme was evaluated on phantom B-mode cine loops and considered both velocity and displacement for a range of down-sampling factors (k = 1–128) at the start of the iterations. The cine loops had a frame rate of 1300–1500 Hz and were beamformed using delay-and-sum. The evaluation on phantom showed that both the mean estimation errors and the standard deviations decreased with an increasing initial down-sampling factor, while they increased with an increased velocity or larger pitch. A limited in vivo study shows that the major pattern of movement corresponds well with state-of-the-art low frame rate motion estimates, indicating that the proposed tracking scheme could enable the study of longitudinal movement of the intima–media complex using ultrafast ultrasound imaging, and is one step towards estimating the propagation velocity of the longitudinal movement of the arterial wall. View Full-Text
Keywords: ultrafast ultrasound imaging; block-matching; speckle tracking; arterial longitudinal wall movement; in vivo ultrafast ultrasound imaging; block-matching; speckle tracking; arterial longitudinal wall movement; in vivo
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Albinsson, J.; Hasegawa, H.; Takahashi, H.; Boni, E.; Ramalli, A.; Rydén Ahlgren, Å.; Cinthio, M. Iterative 2D Tissue Motion Tracking in Ultrafast Ultrasound Imaging. Appl. Sci. 2018, 8, 662.

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