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. 2023 Jan 11;23:20. doi: 10.1186/s12884-022-05204-x

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© The Author(s) 2023, corrected publication 2023

Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/. 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 in a credit line to the data.

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Fig. 1 — Examples of the four key-planes visualized during the first-trimester fetal heart sweep in apical view (A-D) and lateral view (E-H). From top to bottom (each on one row): the parallel atrioventricular flows in four-chamber view plane (A,E), the aortic flow in left ventricle outflow tract view (B,F), the X-sign – crossing of the arterial arches (C,G), and the V-sign, in the three-vessel plane (D,H)