Systems and methods for providing a mean velocity are provided. The systems and methods collect ultrasound data over a period of time for a volumetric region of interest (ROI). The systems and methods display a color flow image based on the ultrasound data, and designate a spatial gate on the color flow image. The spatial gate corresponding to a set of voxels adjacent to one another and within the color flow image. The systems and methods further calculate a mean velocity associated with the set of voxels at a select time, and repeat the calculate operation for multiple select times over the period of time to derive a series of mean velocities. The systems and methods also present indicia indicative of the series of mean velocities exhibited by the set of voxels within the spatial gate over the period of time.
