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Additional file 1: Video S1. Real-time reconstructions of the fetal heart for three representative volunteers with increasing levels of motion. This video corresponds to the same reconstructions shown in Fig. 2. a) Minor displacement of the heart. b) Noticeable in-plane displacement of the heart due to maternal respiration. c) Noticeable through-plane and in-plane motion due to maternal respiration and gross fetal movement. (MP4 14763 kb)
