Zhu, Jia-an Low-frequency and high-intensity ultrasonic may play a better role in Ultrasound Contrast Agent drug delivery system in vivo. [electronic resource] - Medical hypotheses Aug 2009 - 211-2 p. digital Publication Type: Journal Article ISSN: 1532-2777 Standard No.: 10.1016/j.mehy.2009.02.014 doi Subjects--Topical Terms: Contrast MediaDrug Delivery SystemsUltrasonics