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A numerical study of ultrafast vector flow imaging in the neonatal heart

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Abstract
Doppler flow imaging for the visualisation of neonatal intraventricular blood flow currently still has inherent limitations: beam-to-flow angle dependency, aliasing and a too low frame rate. Ultrafast imaging and vector flow estimation may resolve these limitations, yet both still require thorough validation for the pediatric cardiac setting. Hence, a computational modelling approach in the neonatal left ventricle was employed to investigate (i) diverging wave emission to acquire images at very high frame rate and (ii) subsequent speckle tracking algorithms for vector flow estimation. Single non-tilted diverging waves with an opening angle of 60° were transmitted, at a pulse repetition frequency of 9 kHz. Speckle tracking on the acquired ultrasound images provided 2D intraventricular flow estimates at a frame rate of 180 Hz for both the apical four chamber and parasternal short axis view, and this over an entire cardiac cycle. Overall, the blood flow was reasonably accurately tracked throughout the cardiac cycle, yet several imaging artefacts were observed. Zones of low flow proved very difficult to track due to clutter filtering issues, while high spatial flow gradients caused strong underestimation of systolic outflow.
Keywords
SPECKLE TRACKING, Vector flow imaging, diverging waves, neonatal heart

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Chicago
Van Cauwenberge, Joris, Lasse Lovstakken, Solveig Fadnes, Jan Vierendeels, Patrick Segers, and Abigaïl Swillens. 2015. “A Numerical Study of Ultrafast Vector Flow Imaging in the Neonatal Heart.” In IEEE International Ultrasonics Symposium, 1–4. IEEE Xplore: IEEE.
APA
Van Cauwenberge, J., Lovstakken, L., Fadnes, S., Vierendeels, J., Segers, P., & Swillens, A. (2015). A numerical study of ultrafast vector flow imaging in the neonatal heart. IEEE International Ultrasonics Symposium (pp. 1–4). Presented at the IEEE International Ultrasonics Symposium (IUS), IEEE Xplore: IEEE.
Vancouver
1.
Van Cauwenberge J, Lovstakken L, Fadnes S, Vierendeels J, Segers P, Swillens A. A numerical study of ultrafast vector flow imaging in the neonatal heart. IEEE International Ultrasonics Symposium. IEEE Xplore: IEEE; 2015. p. 1–4.
MLA
Van Cauwenberge, Joris, Lasse Lovstakken, Solveig Fadnes, et al. “A Numerical Study of Ultrafast Vector Flow Imaging in the Neonatal Heart.” IEEE International Ultrasonics Symposium. IEEE Xplore: IEEE, 2015. 1–4. Print.
@inproceedings{7105330,
  abstract     = {Doppler flow imaging for the visualisation of neonatal intraventricular blood flow currently still has inherent limitations: beam-to-flow angle dependency, aliasing and a too low frame rate. Ultrafast imaging and vector flow estimation may resolve these limitations, yet both still require thorough validation for the pediatric cardiac setting. Hence, a computational modelling approach in the neonatal left ventricle was employed to investigate (i) diverging wave emission to acquire images at very high frame rate and (ii) subsequent speckle tracking algorithms for vector flow estimation. Single non-tilted diverging waves with an opening angle of 60{\textdegree} were transmitted, at a pulse repetition frequency of 9 kHz. Speckle tracking on the acquired ultrasound images provided 2D intraventricular flow estimates at a frame rate of 180 Hz for both the apical four chamber and parasternal short axis view, and this over an entire cardiac cycle. Overall, the blood flow was reasonably accurately tracked throughout the cardiac cycle, yet several imaging artefacts were observed. Zones of low flow proved very difficult to track due to clutter filtering issues, while high spatial flow gradients caused strong underestimation of systolic outflow.},
  author       = {Van Cauwenberge, Joris and Lovstakken, Lasse and Fadnes, Solveig  and Vierendeels, Jan and Segers, Patrick and Swillens, Abiga{\"i}l},
  booktitle    = {IEEE International Ultrasonics Symposium},
  isbn         = {978-1-4799-8182-3},
  issn         = {1948-5719},
  keyword      = {SPECKLE TRACKING,Vector flow imaging,diverging waves,neonatal heart},
  language     = {eng},
  location     = {Taipei, TAIWAN},
  pages        = {1--4},
  publisher    = {IEEE},
  title        = {A numerical study of ultrafast vector flow imaging in the neonatal heart},
  url          = {http://dx.doi.org/10.1109/ULTSYM.2015.0234},
  year         = {2015},
}

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