DUS 60 Digital Ultrasonic Diagnostic Imaging System User Manual Ultrasound Intensity and Safety
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equivalent to a higher power output.
Proper use of these instrument settings can minimize patient exposure, and optimize the results
and efficiency of the equipment.
Always apply the ALARA principle; use power levels that are: As Low As Reasonably
Achievable.
Imaging Functions Affecting Acoustic Output
In addition to the level of voltage transmitted, adjustment of the following imaging functions and
/or controls may affect the acoustic output.
Item Affection
Probe Acoustic output will be changed with the change of probe.
Imaging mode
There are different parameters applied in B mode, M mode,
and PW mode, so acoustic output will be changed with the
change of among B mode, M mode, and PW mode.
Field of view (scan
angle or scan width)
Frame rate may be changed with the change of the scan angle
of the scan width, and the acoustic output will also be changed.
Image depth
Pulse repeated frequency will be changed with the change of
the image depth, and the acoustic output will be changed.
Focus number
Frame rate and focus position will be changed with the change
of the focus number, and acoustic output will also be changed.
Focus position
Acoustic output will be changed with the change of the focus
position even the beam power level and the beam aperture
have not been changed. Generally, the acoustic output will be
higher with it gets nearer to the probe.
Freeze
When freezing the system, it will stop transmitting ultrasonic
wave.
Transmission power
The output of probe will be changed with the change of the
transmission power, and acoustic output will be changed.
Multi-frequency
The character of the wave focus will be changed with the
change of the frequency, and acoustic output will be changed.
Line density
The acoustic output will be changed with the change of the
number of the scanning line (line density).
PRF The acoustic power will be changed with the change of PRF.
Sample volume
The pulsed wave and the power will be changed with the
change of the sample volume, and acoustic output will be
changed.
AP (acoustic power) The AP adjustment will directly change the acoustic output.
Presets
Presets contain all the parameters above, so any change of the
presetting will change acoustic output.
Restart, or power on/off
System will return to the default setting when restarting, or
powering on/off the system, and acoustic output will be
changed.
DUS 60 Digital Ultrasonic Diagnostic Imaging System User Manual Ultrasound Intensity and Safety
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Operator Control Features：
The user should be aware that certain operator controls may affect the acoustic output. It is
recommended to use the default (or lowest) output power setting and compensate using Gain
control to acquire an image. Other than the output power setting in the soft-menu, which has the
most direct impact on the power; the PRF, image sector size, frame rate, depth, and focal position
also slightly affect the output power. The default setting is normally around 70% of the allowable
power which will not cause any harm to users and is validated to be the most effective for all the
transducers.
A2.3: Probe Acoustic Output Parameters List
A2.3.1 : Test of Probe C321UA:
Test Item B B+M PW
p-, MPa 2.547 2.547 1.244
I
spta,
mW/cm
2
18.3025 41.5535 1324
System settings Control1 Control1 Control1
Z
p,
mm 44.5 44.5 49.5
W
pb6, (
║), mm
(┴), mm
0.2861
0.5062
0.2861
0.5062
0.2958
0.3126
prr, kHz 1.872 -- 6.361
srr, Hz 43 29 --
Output beam Dimensions, cm
2
1.92 1.92 1.92
f
awf,
MHz 3.17 3.17 3.065
APF, % -- -- --
AIF, % -- -- --
Maximum power, mW 38.73 33.717 87.47
I
ob,
mW/cm
2
20.1719 17.5609 45.5573
Power-up mode B mode B mode B mode
Initialization mode B mode B mode B mode
Acoustic output freeze Yes Yes Yes
Z
tt
(mm) -- -- --
Z
ts
(mm) contact contact contact
Inclusive modes -- -- --
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