GE Logiq P5 User Manual

Optimizing Spectral Doppler
LOGIQ 5 Basic User Manual 5-57
Direction 2300002-100 Rev. 2 Figure 5-16. CW Display (Actual Image Not Yet Available)
HPRF HPRF mode is used when detected velocities exceed the processing capabilities of 
the currently selected PW Doppler scale or when the selected anatomical site is too 
deep for the selected PW Doppler scale. 
Time Scale Eight speeds: 12, 8, 6, 5, 4, 3, 2, and 1 second sweeps. 
Angle Correct Indicates flow direction. 
Sample Volume 
GateIndicates sample...

Optimizing the Image
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Direction 2300002-100 Rev. 2
Doppler Mode Scanning Hints
Control overview
Dynamic Range. Affects the amount of Doppler amplitude data 
displayed. 
Wall Filter. Removes the noise caused by vessel or heart wall 
motion at the expense of low flow sensitivity. 
Sweep Speed. Controls speed of spectral update. 
HINTSThe best Doppler data is collected when parallel to flow, with 
orientation also parallel to the anatomic target; whereas, the 
best B-Mode image...

Optimizing Spectral Doppler
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Direction 2300002-100 Rev. 2
Doppler Mode Touch Panel
 Figure 5-17. PW Mode Touch Panel, Page 1
 Figure 5-18. PW Mode Touch Panel, Page 2 

Optimizing the Image
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Direction 2300002-100 Rev. 2
Doppler sample volume gate position (Trackball)
DescriptionMoves the sample volume gate on the B-Modes Doppler Mode 
cursor. The gate is positioned over a specific position within the 
vessel. 
AdjustingTo move Doppler Mode cursor position, move Trackball left or 
right until positioned over the vessel. 
To move sample volume gate position, move Trackball up or 
down until  positioned inside the vessel. 
Va l u e sDefaults...

Optimizing Spectral Doppler
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Direction 2300002-100 Rev. 2
PRF
DescriptionAdjusts 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 PRF 
capability, the system automatically switches to high PRF mode. 
Multiple gates appear, and HPRF is indicated on the display. 
High PRFHigh Pulse Repetition Frequency (HPRF) is a special operating 
mode of PW...

Optimizing the Image
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Direction 2300002-100 Rev. 2
Angle Correct
DescriptionEstimates 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 O), you cannot see the angle correct 
indicator.
AdjustingFlow toward the probe is mapped above the baseline and right 
speaker (as you are facing the...

Optimizing Spectral Doppler
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Direction 2300002-100 Rev. 2
Wall Filter
DescriptionInsulates the Doppler signal from excessive noise caused from 
vessel movement. 
AdjustingTo increase/decrease, select Wall Filter, then adjust Wall Filter 
on the Touch Panel  (PRF and Wall Filter share the same 
control. Press the control to toggle between PRF and Wall 
Filter). Each adjustment cycles you to the next setting. 
Va l u e sValues vary, depending upon the probe and application....

Optimizing the Image
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M/D Cursor
DescriptionDisplays the Doppler Mode cursor on the B-Mode image. 
AdjustingTo activate/deactivate the Doppler Mode cursor, press M/D 
Cursor. Trackball to position sample volume graphic. Adjust SV 
Length on the Touch Panel to adjust sample volume gate size. 
The M/D Cursor key backlights. 
Va l u e sOn/Off. If blood flow velocities cannot be presented, the 
message PRF unavailable. Change Vel Scale appears....

Optimizing Spectral Doppler
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Direction 2300002-100 Rev. 2
Audio Volume
DescriptionControls audio output.
AdjustingTo adjust the audio, adjust Vo l u m e left/right. The volume 
defaults to the last Doppler audio volume setting. 
Va l u e sUsually, a one-third adjustment of the dial gives you the best 
volume. The volume decreases/increases logarithmically, with 
positive flow toward the probe through the right speaker; 
negative flow away from the probe through the left...

Optimizing the Image
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Direction 2300002-100 Rev. 2
Dynamic Range
DescriptionDynamic range controls how echo intensities are converted to 
shades of gray, thereby increasing the range of contrast you can 
adjust. 
AdjustingYou access Doppler dynamic range from the Doppler Mode 
Touch Panel. Each click cycles you to the next setting. To 
increase/decrease, press Dynamic Range. 
Va l u e sThe settings cycle in 4 dB steps from 20 dB to 40 dB. The 
current value displays on the...