1. A method for producing a spectrogram from a plurality of two or three dimensional ultrasound images depicting motion comprising: acquiring a plurality of colorflow ultrasound images comprising motion data where motion is present in the imaged region; delineating a region of interest (ROI) in one of the images, the ROI comprising a plurality of spatially discrete pixels of motion data; forming histograms of the motion data of the spatially discrete pixels of the ROI in a plurality of images containing the pixel information over a plurality of defined temporal intervals; mapping the histograms of the plurality of images to a plurality of temporally discrete lines; and displaying the lines as a spectrogram for the ROI.