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Attenuation coefficient of various tissues [19]
| Tissue/Medium | Attenuation coefficient (dB/cm/MHz)* | Acoustic impedance (MPa·s·m−1) |
|---|---|---|
| Water | 0.0022 | 1.5 |
| Blood | 0.15 | 1.6 |
| Soft tissue | 0.75 | 1.6 |
| Air | 7.50 | 0.00001 |
| Bone | 15.0 | 8.0 |
| Fat | 0.63 | 1.4 |
| Kidney | 1.0 | 1.6 |
| Lens of eye | 0.05 | 1.7 |
The unit of the attenuation coefficient is decibels per centimeter of tissue traversed per megahertz
