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I
ta
(z)
Time average sound intensity
I
ta, α
(z)
Decay time average sound intensity
I
zpta
(z)
Spatial peak time average sound
intensity
I
zpta, α
(z)
Decay time space peak time average
sound intensity
MI
Mechanical index
P
output power
P
α
Output power after attenuation
P
1
Bounded output power
p
i
Pulse sound pressure square integral
p
r
Peak sparse sound pressure
p
r.a
Peak sparse sound pressure
Prr
Pulse repetition frequency
TI
Thermal index
TIS
Soft tissue thermal index
TIB
Bone thermal index
TIC
Skull thermal index
Z
Distance from the sound source to the
specified point
z
b
Distance from the sound source to the
specified point
z
bp
Breakpoint depth
z
s
Depth for TIS