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  • A fluorinated hydrocarbon and gaseous substance used as an imaging contrast agent. After administration in microsphere form, perflutren exhibits lower acoustic impedance than blood and improves ultrasound signaling. Check for \'https://www.cancer.gov/about-cancer/treatment/clinical-trials/intervention/C47664\' active clinical trials using this agent. (\'http://ncit.nci.nih.gov/ncitbrowser/ConceptReport.jsp?dictionary=NCI%20Thesaurus&code=C47664\' NCI Thesaurus)
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