| ω = 2πf | and f is the ultrasound frequency, |
| Aj | includes the effects of transmission through boundaries, |
| αj(ω) = | attenuation coefficient = βj ω / 2π, |
| βj = | attenuation coefficient slope |
| vj(ω) = | phase velocity, |
| d = | sample thickness, |
| c = | speed of sound in water, |
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