Acoustic Parameters As Measured In Water - GE Vscan Air Manual

Acoustic Parameters as Measured in Water

Definitions, symbols and abbreviations
IEC
MI Mechanical Index
TIS Soft Tissue Thermal Index
TISas Soft Tissue Index at-surface, scanning or non-scanning
TISbs Soft Tissue Index below-surface, scanning or non-scanning
TIB Bone Thermal Index
TIBas Bone Thermal Index at surface, scanning or non-scanning
TIBbs Bone Thermal Index below-surface, scanning or non-scanning
TIC Cranial-bone Thermal Index
Attenuated peak-rare-factional acoustic pressure
α
p
r,
C Normalizing Coefficient 1MPa*MHz-1/2
MI
P Output power
P Bounded square output power
1x1
z Depth for TIS below surface
s
z Depth for TIB below surface
b
z Depth for MI
MI
α
Z Depth for I
pii,
fawf Acoustic working frequency
prr Pulse repetition rate
srr Scan repetition rate
n Number of pulses per scan line
pps
Attenuated pulse average intensity
α
I ,
pa,
Attenuated speatial-peak temporal-average intensity
α
I ,
spta,
I Spatial-peak temporal-average intensity
spta
pr Peak-rare-factional acoustic pressure
–
Vscan Air User Manual
Direction GP092020-1EN Rev 18
The following definitions, symbols and abbreviations are used in
the acoustic output reporting tables in this chapter:
Meaning—IEC/EN62359 Ed.2
α α
, and I ,
pa, spta,
Acoustic Output
8-7