GE Vscan Air - Acoustic Parameters as Measured in Water

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