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Top: Image of tPA-loaded ELIP in a glass vial imaged with a 20 MHz intravascular ultrasound catheter (25× dilution). The central dark spot corresponds to the imaging catheter. Bottom: Image of tPA-loaded ELIP in an imaging well imaged with a 3.5 MHz harmonic transthoracic probe (100× dilution). The artifact at the bottom of the image corresponds to the Rhocee rubber used as sound-absorbing material.
