GE Logiq P5 User Manual

Optimizing Color Flow
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Activating Power Doppler Imaging (PDI)
To activate PDI, 
1. Press PDI. The color flow window appears over the B-Mode 
image. Move the Trackball to move the CF window. To exit, 
press PDI or select a new mode. 
Uses
Power Doppler Imaging is a color flow mapping technique used 
to map the strength of the Doppler signal coming from the flow 
rather than the frequency shift of the signal. Using this 
technique, the ultrasound...

Optimizing the Image
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Color Flow and Power Doppler Displays
 Figure 5-10. Power Doppler Imaging Display
ItemDescription
1 Color Flow Region of Interest (ROI)
2 Color Flow Parameters: Frequency, Gain, Power Output, PRF, Wall Filter, and Packet Size
3 Color Flow Bar
ItemDescription
1 Color Flow Region of Interest (ROI)
2 Color Flow Parameters: Frequency, Gain, Power Output, PRF, Wall Filter, and Packet Size
3 Color Flow Bar 

Optimizing Color Flow
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Direction 2300002-100 Rev. 2
Color Flow Scanning Hints
HINTSColor Flow Mode controls produce the following results: 
Line Density. Trades frame rate for sensitivity and spatial 
resolution. If the frame rate is too slow, reduce the size of the 
region of interest, select a different frame rate setting, or 
reduce the packet size. 
Wall Filter. Affects low flow sensitivity versus motion artifact. 
Color Threshold. Percentage of gray scale level where...

Optimizing the Image
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Direction 2300002-100 Rev. 2
Color Flow Mode Touch Panel
 Figure 5-11. Color Flow Mode Touch Panel, Page 1
 Figure 5-12. Color Flow Mode Touch Panel, Page 2 

Optimizing Color Flow
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Direction 2300002-100 Rev. 2
PDI (Power Doppler Imaging) Mode Touch Panel
 Figure 5-13. PDI Mode Touch Panel, Page 1
 Figure 5-14. PDI Mode Touch Panel, Page 2 

Optimizing the Image
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Gain
DescriptionGain amplifies the overall strength of echoes processed in the 
Color Flow window or spectral Doppler timeline.
AdjustingGain values change depending on the probe and application; 
they are not associated with a particular position of the button. 
To decrease/increase Gain, adjust the dial to the left/right. 
Va l u e sValues vary by probe, application, and multi frequency setting. 
Gain displays as dB. Gain...

Optimizing Color Flow
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Direction 2300002-100 Rev. 2
Wall Filter
DescriptionFilters out low flow velocity signals in order to hide unusable 
motion. It helps get rid of motion artifacts caused from breathing 
and other patient motion. 
AdjustingTo raise/lower the wall filter, press PRF/Wall Filter until you 
reach Wall Filter, then adjust Wall Filter left/right. 
Va l u e sValues vary, depending upon probe, application, and packet 
size. The wall filter is shown graphically...

Optimizing the Image
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Invert (Color Invert)
DescriptionLets you view blood flow from a different perspective, e.g., red 
away (negative velocities) and blue toward (positive velocities). 
You can invert a real-time or frozen image. 
NOTE:  Invert reverses the color map, NOT the color PRF. 
AdjustingTo reverse the color flow, press Invert (Color Invert) . 
In Triplex, both Color Flow and Doppler Mode velocity scales 
are inverted. 
Va l u e...

Optimizing Color Flow
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Angle Steer and Fine Angle Steer
DescriptionYou can slant the B-Mode or Color Flow linear image left or right 
to get more information without moving the probe. 
AdjustingTo slant the linear image to the left/right, adjust Angle Steer. 
Press Angle Steer to access Fine Angle Steer. 
Va l u e sLinear probes can be steered left, center, or right up to a 
maximum of 20 degrees, depending on the probe. 
Angle Steer values vary...

Optimizing the Image
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Map
DescriptionBrings out the tissue behind the color map. 
AdjustingPress Duplex to adjust. 
Va l u e sOn/Off. 
Variance Maps (VV). Provides a measure of turbulence 
(stenosis). Adds green to velocity maps. 
Symmetric Velocity Imaging Map. Map V3  shows both positive 
and negative velocities using the same colors. 
BenefitsShows the direction of the flow and highlights the higher velocity 
flows.