User's Manual
Acclarix AX8 Diagnostic Ultrasound System User Manual Imaging
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Table 5-3 PW Mode Touch Screen Controls
5.2.2. HPRF
Conventional PW Doppler scales are limited by the Nyquist limit. High Pulse Repetition
Frequency (HPRF) allows the system to exceed the Nyquist limit by having multiple Doppler
pulses in the body at the same time. In HPRF imaging multiple Doppler gates are displayed, since
the multiple Doppler pulses could be giving information from different depths. HPRF is
automatically invoked when needed to maintain the requested depth and scale. For example, if
the system is at a high scale and you move the cursor deeper the system may automatically
invoke HPRF. This can also happen if the cursor is deep and you increase scale.
If HPRF is active you will see multiple Doppler gates on the reference image. If you do not want
to be in HPRF, decrease the scale or move the cursor to a more shallow location until only one
gate is displayed.
5.2.3. Update
The Update hard key toggles between acquiring Doppler strip and acquiring the reference image.
5.3 CW-mode
Depending on system configuration, CW may be available on the P5-1XQ transducer. There are
two ways to invoke CW:
Press the CW button on the Doppler touchscreen to switch between PW and CW modes.
Configure the F1 or F2 programmable hardkey to invoke CW directly (see section 9.1 for
details).
5.3.1. CW Touch Screen Controls
The following touch screen controls impact the CW image. Touch screen controls can be located
where you want them to be. See section 3.8 for details.
Auto Trace
Direction
Press to specify which side of the Doppler baseline to take
measurements from. there are 3 options:
Up: traces positive portion of waveform (above baseline).
Down: traces negative portion of waveform (below baseline).
Both: traces waveform on both sides of baseline.
Acoustic
power*
Adjusts the acoustic output power of the activated transducer. It
is only available in live imaging. Higher acoustic power numbers
correspond to more brightness and contrast in the image and
more force of penetration, but ALARA principle should be
followed in actual situations.
Auto
Optimization*
The Auto push button automatically updates the PW gain, DR,
baseline and PRF scale. Each single press of the button renews
the automatic optimization.
Whether Gain, DR or Scale/Baseline is optimized when pressing
Auto button can be configured in Set-up. See section 9.1.4 for
detail.