Figure 8. Vascular recognition imaging. A subtle lesion (arrowhead in (a)) suggests a metastasis in this patient with a known colorectal carcinoma. Using a low power (MI 0.1) microbubble-specific mode in which the contrast information is shown in the colour overlay, a peripheral feeding vessel (arrowhead in (b)) is seen the arterial phase at 17 s. Later ((c), 41 s) the contrast medium has washed out of the tumour but is continuing to accumulate in the large vascular volume of the liver so that the metastasis now appears as a prominent colour defect, leaving no doubt as to its presence. (In this mode motion of contrast medium in large vessels is shown as red or blue, according to their flow direction relative to the transducer, while stationary blood (i.e. the microcirculation) is depicted in green.) (SonoVue kindly supplied by Bracco, Milan.)