28
16012-101 Rev. C
General Specifications (Continued)
Acoustic Output Powers
Acoustic Output
MI
I
SPTA.3
(mW/cm
2
)
I
SPPA.3
(W/cm
2
)
Global Maximum Value
0.155±0.014
3.72±0.98
12.2±2.0
P
r.3
(MPa)
0.70±0.07
W
c
(mW)
0.040±0.010
0.040±0.010
f
c
(MHz)
20.2±1.4
20.2±1.4
20.2±1.4
z
sp
(cm)
0.3
0.3
0.3
x
-6
0.11
0.11
Beam Dimensions
(cm)
y
-6
0.11
0.11
PD (ms)
0.07
0.07
PRF (Hz)
4600
4600
Az
0.2
Associated
Acoustic
Parameters
EBD (cm)
El
0.2
Operator Controls
There are no operator controls that alter the acoustic output power
Uncertainties in the above values are reported as
±
1 standard deviation. The derated intensities were derived from those
measured in water based on the measured center frequency of the acoustic signal (f
c
, MHz) and the distance from the
transducer to the point at which the intensity was measured (d, cm) using the formula: Derated Intensity = Measured
Intensity *
e
-0.069*fc*d
In compliance with IEC61157 the peak rarefaction acoustic pressure (p
r
) is less than 1 MPa; the output beam intensity
(I
ob
) is less than 20 mW/cm
2
; and the spatial-peak temporal average derived intensity (I
spta
) is less than 100 mW/cm
2
.
Definitions
I
SPTA.3
- derated spatial-peak temporal-average intensity (milliwatts per square centimeter).
I
SPPA.3
- derated spatial-peak pulse-average intensity (watts per square centimeter).
MI - Mechanical Index.
p
r.3
- derated peak rarefactional pressure (megapascals) associated with the transmit pattern giving rise to the value
reported under MI.
W
o
- ultrasonic power (milliwatts). For the operating condition giving rise to I
SPTA.3
, W
o
is the total time-average power.
For the operating condition giving rise to I
SPPA.3
, W
o
is the ultrasonic power associated with the transmit pattern giving rise
to the I
SPPA.3
value.
f
c
- center frequency (MHz). For MI and I
SPPA.3
, fc is the center frequency associated with the transmit pattern giving rise
to the global maximum value of the respective parameter.
z
sp
- axial distance at which the reported parameter is measured (centimeters).
x
-6
, y
-6
- are respectively the in-plane (azimuthal) and out-of-plane (elevational) -6 dB dimensions in the x-y plane where
z
sp
is found (centimeters).
PD - pulse duration (microseconds)
PRF - pulse repetition frequency (Hz)
EBD - entrance beam dimensions for the azimuthal and elevational planes (centimeters).
Summary of Contents for IOPac Advanced
Page 1: ...ADVANCED User s Guide ...
Page 37: ...16012 101 Rev C 37 Notes ...
