Perflutren-containing microspheres 5 - 8 x 108, with a mean diameter range of 2.5 - 4.5 µm, equivalent to 0.19 mg perflutren gas per ml.
1 ml sisaldab 5… 8 x 108 perflutreeni sisaldavaid mikrosfääre, mille keskmine läbimõõt on vahemikus 2, 5… 4, 5 μm, vastab 0, 19 mg/ ml gaasilisele perflutreenile.