The present invention relates to a method of imaging using multiple doses of an echogenically persistent contrast agent. In particular, it relates to the use of ultrasound energy to eliminate residual echogenicity attributed to the first dose of contrast agent prior to administering a second dose of...http://www.google.com/patents/US6086540?utm_source=gb-gplus-sharePatent US6086540 - Methods of ultrasound imaging using echogenically persistent contrast agents
