An ultrasound imaging system comprising: an ultrasound probe for receiving ultrasound signals for a plurality of transmit/receive events; and at least one processor in communication with the ultrasound probe, the at least one processor configured to: identify microbubbles in the ultrasound signals for the plurality of transmit/receive events; represent individual ones of the identified microbubbles as a multi-pixel spot comprising a plurality of pixels, wherein the number of the plurality of pixels for individual ones of the identified microbubbles is less than a number of pixels representative of the entire extent of the identified microbubble according to a point spread function of the ultrasound imaging system and greater than a single pixel; and combine the ultrasound signals including the represented microbubbles for the plurality of transmit/receive events to form an enhanced contrast accumulation image, and characterized in that: the processor is configured to represent the individual ones of the identified microbubbles as multi-pixel spots by passing the identified microbubbles through a filter that applies an intensity threshold value for selecting which pixels of the microbubbles to visualize, wherein the filter is based on the range of intensities presented in each identified microbubble and wherein only pixels of the identified microbubbles above the threshold value are represented in the individual ones of the plurality of ultrasound images. an ultrasound probe for receiving ultrasound signals for a plurality of transmit/receive events; and at least one processor in communication with the ultrasound probe, the at least one processor configured to: identify microbubbles in the ultrasound signals for the plurality of transmit/receive events; represent individual ones of the identified microbubbles as a multi-pixel spot comprising a plurality of pixels, wherein the number of the plurality of pixels for individual ones of the identified microbubbles is less than a number of pixels representative of the entire extent of the identified microbubble according to a point spread function of the ultrasound imaging system and greater than a single pixel; and combine the ultrasound signals including the represented microbubbles for the plurality of transmit/receive events to form an enhanced contrast accumulation image, and characterized in that: identify microbubbles in the ultrasound signals for the plurality of transmit/receive events; represent individual ones of the identified microbubbles as a multi-pixel spot comprising a plurality of pixels, wherein the number of the plurality of pixels for individual ones of the identified microbubbles is less than a number of pixels representative of the entire extent of the identified microbubble according to a point spread function of the ultrasound imaging system and greater than a single pixel; and combine the ultrasound signals including the represented microbubbles for the plurality of transmit/receive events to form an enhanced contrast accumulation image, and characterized in that: the processor is configured to represent the individual ones of the identified microbubbles as multi-pixel spots by passing the identified microbubbles through a filter that applies an intensity threshold value for selecting which pixels of the microbubbles to visualize, wherein the filter is based on the range of intensities presented in each identified microbubble and wherein only pixels of the identified microbubbles above the threshold value are represented in the individual ones of the plurality of ultrasound images.