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Ultrasound sonography images of C4F8 microbubbles generated with a solution containing 1 mg mL–1 oleosin and 10 mg mL–1 (PEO)78-(PPO)30-(PEO)78. Ultrasound images of microbubbles (a, b) 1–2 h after generation and (c, d) 30 min and (e, f) 7 days after initial imaging. Ultrasound images of control samples are reported in panels g and h. The microbubbles have a radius of about 4 μm.
