The present invention relates to a three-dimensional ultrasound imaging system (10) comprising an ultrasound image acquisition device (46) and a mobile console (18), which are both connected in a wireless manner. In particular, the ultrasound acquisition device has a battery powered probe (14) having a probe housing (20), and the transducer array (32) and an image acquisition hardware assembly (37) comprising at least a beam former (34) and a signal processor (36) are located within the probe housing (16). By this, a low weight flexible, three-dimensional ultrasound imaging system (10) may be provided.