| 摘要 |
<p>The invention concerns gas-containing microparticles for use in ultrasound diagnostics. The wall material of the microparticles is made either from block copolymers of α-, β-, or η-hydroxycarboxylic acid polyesters with linear or stellate polyethylene glycols and, optionally, liquid crystals, or from α-, β-, or η-hydroxycarboxylic acid polyesters with liquid crystals. The invention also concerns agents containing these particles for use in ultrasound diagnostics and processes for producing the said agents and particles.</p> |
