目的用PLLA - PEG - plla共聚物为外壳材料制备微泡造影剂，建立体外声学性质测定装置和方法。
Objective To prepare an ultrasound microbubble contrast agent using PLLA-PEG-PLLA copolymer as the shell material, and test their acoustic characteristics in vitro.
目的用PLLA - PEG - plla共聚物为外壳材料制备微泡造影剂，建立体外声学性质测定装置和方法。
Objective To prepare an ultrasound microbubble contrast agent using PLLA-PEG-PLLA copolymer as the shell material, and test their acoustic characteristics in vitro.
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