Requirements of Microbubble Contrast Agents for Ultrasound
| Radius of particle (nm) | Particles per mm3 to be detected | Particles per cell to be detected |
|---|---|---|
| 63,000 | 1 | 1 every 106 cells |
| 6,300 | 103 | 1 every 103 cells |
| 630 | 106 | 1 per cell |
| 100 | 25 × 107 | 250 every cell |
| 1,000 | 25 × 104 | 1 every 4 cells |
| 10,000 | 250 | 1 every 4,000 cells |