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Perflutren definition: 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.
Perflutren Lipid Microspheres definition: An injectable suspension of liposome-encapsuled microspheres containing the fluorocarbon gas perflutren for contrast enhancement in ultrasound procedures. Because the acoustic impedance of perflutren lipid microspheres is much lower than that of blood, impinging ultrasound waves are scattered and reflected at the microsphere-blood interface and may be visualized with ultrasound imaging.
 
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