OBJECTIVE: to investigate the difficulties and solution in the preparation of different ultrasound contrast agents so as to find an ideal polymer contrast agent.
目的：探讨各种超声对比剂制备中遇到的困难以及解决方法，从而最终寻找合理的高分子材料超声对比剂。
OBJECTIVE: to investigate the difficulties and solution in the preparation of different ultrasound contrast agents so as to find an ideal polymer contrast agent.
目的：探讨各种超声对比剂制备中遇到的困难以及解决方法，从而最终寻找合理的高分子材料超声对比剂。
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