Fetal MRI was carried out on a 3.0T Verio system (Siemens Healthineers) using a six-channel body-flex array coil, along with a spine coil. A fully flow-compensated 2D-/3D-SWI sequence was used to acquire fetal images [12 (link)]. The sequence parameters used are given in Table-1. In all subject scans, T2-HASTE and SWI data (either 2D-SWI or 3D-SWI or both) were acquired multiple times whenever fetal motion was encountered. SWI data were always acquired axial to the fetal brain.