Key To Tables - GE LOGIQ 500 Advanced Reference Manual

FDA Acoustic Output Data

Key to Tables

Symbol Units
Output Display Indices:
MI n/a
TIS n/a
scan
TIS n/a
non-scan
TIB n/a
TIC n/a
Intensity, Power, and Pressure Parameters:
I mW/cm
SPTA.3
2
I W/cm
SPPA.3
I mW/cm
TA.3
PII n/a
max
W mW
0
W (z ) mW
.3 1
P MPa
r
P MPa
r.3
Transmit Parameters:
f MHz
c
ms
PD
PRF kHz
Distance/Depth and Area Parameters:
d (z) cm
eq
z cm
sp
z cm
1
z cm
bp
ROC cm
FL cm
2
A cm
aprt
6–106
Mechanical Index
Soft Tissue Thermal Index (scanning mode)
Soft Tissue Thermal Index (non-scanning mode)
Bone Thermal Index
Cranial Thermal Index
2
Spatial Peak-Temporal Average Intensity derated to 0.3 dB/cm
/MHz
Spatial Peak-Pulse Average Intensity derated to 0.3 dB/cm/MHz
2
Time average Intensity, derated to 0.3 dB/cm/MHz
Maximum free-field pulse intensity integral
Ultrasonic Power
Derated ultrasonic power at axial distance z
Peak rarefactional pressure
Peak rarefactional pressure, derated to 0.3 dB/cm/MHz
Center Frequency
Pulse Duration
Pulse Repetition Frequency
Equivalent beam diameter as a function of z, = [(4/p)(W
Axial distance to spatial peak
Axial distance to the location of max[min(W
z
bp
Break point depth = 1.69(A
Radius of curvature
Focal Length
Area of Active Aperture
Table 6–142. Index Tables Key
Description
1
(z), I (z) x 1 cm
.3 TA.3
1/2
)
aprt
LOGIQ 500 Advanced Reference Manual
1/2
/I (z))]
0 TA
)] where z 
2
2276614–100 Rev. 0