TABLE I.
Attributes of the microbubble distributions used in calculations of attenuation.
| Microbubble distribution | Peak density radius (μm) | % of bubbles less than peak density radius | σ (standard deviation of bubble distribution) | Bubbles per μl for volume fraction 10−5 | Commercial agent with similar properties |
|---|---|---|---|---|---|
| A | 1.1 | 98% < 5 μm | 0.40 | 165 | Definitya |
| B | 1.7 | 95% < 5 μm | 0.35 | 80 | Optisonb |
| C | 2.37 | — | 0.47 | 9 | Albunexc |
a
Lantheus Medical Imaging, N. Billerica, MA.
b
GE Healthcare, Milwaukee, WI.
c
Molecular Biosystems, San Diego, CA.