Ultrasound system and method for providing additional information representing a change of blood flow over time

The ultrasound system and method for providing a blood flow change with time as additional information with a Doppler mode image is disclosed. The ultrasound system according to the invention, ultrasound data to the blood and transmits ultrasound signals to a target object containing a flowing object of interest, operative to receive ultrasound echo signals reflected from the target object acquiring first ultrasound data and second ultrasound data an acquiring unit; And a second connecting to the ultrasound data acquisition unit is, the first based on the ultrasound data, the B mode (brightness mode) forming an image, and sets the at least one sample volume on the B mode image, the at least one sample volume forming a blood flow information based on the ultrasound data, and a processor operative to form the additional information representing the blood flow changes in the Doppler mode image and a time on the basis of the blood flow information.