1. A method for generating a composite tissue image and tissue movement image in an ultrasound system comprising: acquiring echo signals for a plurality of range positions along a plurality of ultrasonic beams covering a spatial region of interest during a first time period; acquiring echo signals for a plurality of range positions along the plurality of ultrasonic beams covering the spatial region of interest during a second time period; acquiring echo signals for a plurality of range positions along the plurality of ultrasonic beams covering the spatial region of interest during a third time period; processing acquired echo signals from at least said first and second time periods to produce a first frame of a composite tissue image and tissue movement image; and processing acquired echo signals from at least said second and third time periods to produce a second frame of a composite tissue image and tissue movement image.