Embodiments for providing volume information of a periodically moving target object with an ultrasound system are disclosed. An ultrasound data acquisition unit is configured to transmit/receive ultrasound signals from/to a periodically moving target object to thereby form ultrasound data. A processing unit is coupled to the ultrasound data acquisition unit. The processing unit is configured to form volume data including a plurality of frames based on the ultrasound data, set a moving period of the target object based on the volume data, reconstruct the volume data into a plurality of sub-volume data based on the moving period and measure volume of the target object based on the plurality of sub-volume data to thereby form volume information.
