8-5
a: ACOUSTIC ATTENUATiON COEFFICIENT
Aaprt : -12dB OUTPUT BEAM AREA
Deq : EQUlVALENT APERTURE DIAMETER
deq : EQUIVALENT BEAM DIAMETER
fawf : ACOUSTIC WORKING FREQUENCY
Ipa : PULSE-AVERAGE INTENSITY
Ipa, a : ATTENUATED PULSE-AVERAGE INTENSITY
Ipi : PULSE-1NTENSTY INTEGRAL
Ipi, a : ATTENUATED PULSE-INTENSTY INTEGRAL
MI : MECHANICAL INDEX
P : OUTPUT POWER
Pa : ATTENUATED OUTPUT POWER
Pr : PEAK-RAREFACTINAL ACOUSTIC PRESSURE
Prr : PULSE REPETON RATE
TIS : SOFT-TISSUE THERMAL INDEX
td : PULSE DURATION
X,Y : -12dB OUTPUT BEAM DIMENSIONS
z : DISTANCE FROM THE SOURCE TO A SPECIFIED
POINT
zb : DEPTH FOR TIB
zbp : BREAK-POINT DEPTH
zs : DEPTH FOR TIS
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