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. 2016 Aug 8;16:45. doi: 10.1186/s12880-016-0150-z

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© The Author(s). 2016

Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.

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Fig. 2 — Vortical blood flow in the main pulmonary artery. Velocity-color-encoded streamlines (a, b, c) and 3D velocity vectors (d, e, f) projected onto multi-planar reformatted anatomical images demonstrate counter-clockwise rotating vortical blood flow nested in bi-directional pulmonary flow caused by PDA. This structure is present throughout the entire cardiac cycle (Additional file 2: in the online-only Data Supplement)