Answer
It adds reflected ultrasound signals from blood or urinary fluid, which may reveal structures or flow that were not clear on the original scan.
Sources for this answer
- SonoVue 8 microlitres/ml, powder and solvent for dispersion for injection — Current selected SmPCemc · Summary of Product Characteristics
General medicine information. Follow the instructions for your own medicine and speak to a pharmacist or clinician about your individual circumstances.