Methods, systems and computer program products for imaging fluid in a sample include acquiring a plurality of echo signals for a region of interest in the sample from a plurality of ultrasound transducer elements in an ultrasound transducer array； applying a stationary echo cancellation to the plurality of echo signals to reduce or remove echo signals that are associated with stationary and/or slower moving features to provide a corresponding plurality of filtered signals； extracting coherence information from the plurality of filtered signals； and imaging the region of interest in response to the coherence information from the plurality of filtered signals.
