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Doppler Mode Controls
Control
Auto Spectral
Optimize [ASO]
(Auto)
Set/ B Pause
Doppler sample
volume gate position
Doppler sample
volume length
Scale (Velocity
Scale)
Angle Correct
Quick Angle
Wall Filter
Baseline
Mode Cursor
Steer and Fine Steer
Volume
Invert
–
Versana Essential
5759238-100 English Rev. 2
Doppler is intended to provide measurement data concerning
the velocity of moving tissues and fluids. PW Doppler lets you
examine blood flow data selectively from a small region called
the sample volume.
Table 2-4:
Doppler Mode Controls
Bioeffect
Yes
Auto in Doppler Mode optimizes the spectral data. Auto adjusts the
Velocity Scale/PRF (on live images only), baseline shift and invert
(if preset). The benefit of Auto can be found in reduced optimization
time and a more consistent and accurate optimization process.
Yes
Toggles between simultaneous and update presentation while
viewing the timeline.
Yes
Moves the sample volume gate on the B-Mode's Doppler Mode
cursor. The gate is positioned over a specific position within the
vessel.
Yes
Sizes the sample volume gate.
Yes
Adjusts the velocity scale to accommodate faster/slower blood flow
velocities. Velocity scale determines pulse repetition frequency.
If the sample volume gate range exceeds single gate Scale
capability, the system automatically switches to high PRF mode.
Multiple gates appear, and HPRF is indicated on the display.
No
Estimates the flow velocity in a direction at an angle to the Doppler
vector by computing the angle between the Doppler vector and the
flow to be measured.
NOTE: When the Doppler Mode Cursor and angle correct indicator
are aligned (the angle is 0), you cannot see the angle correct
indicator.
No
Quickly adjusts the angle by 60 degrees.
No
Insulates the Doppler signal from excessive noise caused from
vessel movement.
No
Adjusts the baseline to accommodate faster or slower blood flows
to eliminate aliasing.
No
Displays the Doppler Mode cursor on the B-Mode image.
Yes
You can slant the ROI of the Color Flow linear image left or right to
get more information without moving the probe. The angle steer
function only applies to linear probes.
No
Controls audio output.
No
Vertically inverts the spectral trace without affecting the baseline
position.
User Guide
Optimizing the Image
Description/Benefit
2-9
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