1. An ultrasound imaging system, comprising: an ultrasound transducer array that receives a set of echo signals produced in response to an ultrasound signal traversing flowing structure in a portion of a tubular structure of an object or subject in an imaging field of view; an image processor that processes the set of echo signals and generates a structure image indicative of the portion of the tubular structure; a color flow processor that processes the set of echo signals and generates a color flow image indicative of a flow of the flowing structure in the portion of the tubular structure, including a flow direction and a flow magnitude of the flowing structure in the portion of the tubular structure; a color flow corrector that corrects the color flow image for at least one of color noise artifact or color flash artifact, producing a corrected color flow image; and a video processor that displays the structure image and the corrected color flow image superimposed over the structure image.