vivo4d2.5. Data preparation. For synthetic and in vivo data sets, we rely on the following data preparation steps to create training data. We consider the acquired image volume as the hh-resolution reference data. 1. We firstIn this study, we propose 4D Ultrafast vector flow imaging, through the use of 4D plane-wave ultrafast and cross-beam vector Doppler imaging in order to map in-vivo blood flows in