Data sharing not applicable to this article as no datasets were generated or analysed during the current study. Videoclip S1 Oblique sagittal four-dimensional spatiotemporal image correlation imaging with color Doppler rendering at 22 + 5 weeks' gestation, illustrating anteroposterior swirling of blood flow in the pulmonary trunk, as well as normal visualization of the ductal (1) and aortic (2) arches. Videoclip S2 Four-dimensional spatiotemporal image correlation imaging with color Doppler rendering in right ventricular outflow tract view at 22 + 5 weeks' gestation, demonstrating the aliasing flow (hand symbol) across the bileaflet pulmonary valve and anteroposterior swirling of blood flow (arrow) in the pulmonary trunk. Videoclip S3 Four-dimensional spatiotemporal image correlation volume obtained at 27 + 1 weeks' gestation displayed in three orthogonal planes: plane C demonstrates the bileaflet pulmonary valve (hand symbol). Videoclip S4 Four-dimensional spatiotemporal image correlation imaging at 27 + 1 weeks' gestation showing the bileaflet pulmonary valve cross section in plane C during systole and diastole. Videoclip S5 Postnatal grayscale and color Doppler imaging in the parasternal short-axis view on day 1 after birth, revealing an eccentric blood flow jet swirling within the pulmonary trunk. Videoclip S6 Postnatal (day 1 after birth) cross-sectional grayscale ultrasound imaging of the pulmonary valve in the parasternal short-axis view with a clockwise oblique tilt at the aortic valve level, confirming the presence of only two pulmonary valve leaflets. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.
Karmegaraj et al. (Sun,) studied this question.