Now playing · 08 Ultrasound
Ultrasound attenuation
A = 40.00 dB
A
d
B
=
α
f
z
,
I
=
I
0
⋅
10
−
A
/
10
A_{\mathrm{dB}} = \alpha f z,\quad I = I_0 \cdot 10^{-A/10}
A
dB
=
α
f
z
,
I
=
I
0
⋅
1
0
−
A
/10
Soft-tissue rule of thumb: 0.5 dB/cm/MHz one way.
Laser