Embodiments of an ultrasound system for outputting an ultrasound image through an ultrasound examination are disclosed. The frequency extractor includes a frequency multiplier, first and second filters, a binary circuit and a frequency divider. A flow table is provided having a plurality of flow table entries. Described embodiments also enable the fetching and processing of data in a \u201cbig data\u201d environment\u2014a system that contains multiple servers’ worth of data, with improved time and bandwidth considerations. The rotation-restricting member is disposed between the annular member and the first sounding part for restricting rotation of the first sounding part.