Optimizing the Image
Versana Essential – User Guide 2-9
5759238-100 English Rev. 2
Doppler Mode Controls
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
Control Bioeffect Description/Benefit
Auto Spectral
Optimize [ASO]
(Auto)
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.
Set/ B Pause Yes Toggles between simultaneous and update presentation while
viewing the timeline.
Doppler sample
volume gate position
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.
Doppler sample
volume length
Yes Sizes the sample volume gate.
Scale (Velocity
Scale)
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.
Angle Correct 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.
Quick Angle No Quickly adjusts the angle by 60 degrees.
Wall Filter No Insulates the Doppler signal from excessive noise caused from
vessel movement.
Baseline No Adjusts the baseline to accommodate faster or slower blood flows
to eliminate aliasing.
Mode Cursor No Displays the Doppler Mode cursor on the B-Mode image.
Steer and Fine Steer 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.
Volume No Controls audio output.
Invert No Vertically inverts the spectral trace without affecting the baseline
position.
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