GE Logiq P5 User Manual

Optimizing Color Flow
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Direction 2300002-100 Rev. 2
Threshold
DescriptionThreshold assigns the gray scale level at which color 
information stops. 
AdjustingTo increase/decrease the gray scale threshold, press 
Threshold left/right. 
Va l u e sThe settings cycle through various values: 10%-100% of the 
gray scale. High values display more color; low values displays 
more B-Mode gray scale data. The Color Threshold level is 
displayed on the Touch Panel. 
Values vary by probe...

Optimizing the Image
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Transparency Map
DescriptionBrings out the tissue behind the color map. 
AdjustingSelect Transparency Map to adjust
Va l u e s0-4
BenefitsHelps demonstrate the tissues behind the color. 
Spatial Filter
DescriptionSmooths out the color, makes it look less pixely. 
AdjustingSelect Spatial Filter to adjust. 
Va l u e s0-5
BenefitsSmooths the image. 
Duplex
DescriptionDuplex On: simultaneous B-Mode + Color Flow Mode. 
Duplex...

Optimizing Color Flow
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Ace
DescriptionActivates/deactivates Adaptive Color Enhancement (Ace), a 
motion artifact elimination process. 
AdjustingTo adjust, select the next page and then select Ace. The Ace 
Touch Panel key is lit. 
Va l u e s0-4. 
Values vary by probe and application and are returned to factory 
or user preset value when you change: Probe, Exam Category, 
Exam Calcs, or New Patient. 
BenefitsAce: Beneficial when imaging slow flow...

Optimizing the Image
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Power Doppler Imaging (PDI) 
DescriptionPower Doppler Imaging (PDI) is a color flow mapping technique 
used to map the strength of the Doppler signal coming from the 
tissue rather than the frequency shift of the signal. Using this 
technique, the ultrasound system plots color flow based on the 
number of reflectors that are moving, regardless of their velocity. 
AdjustingTo activate/deactivate PDI, press PDI. 
Va l u e...

Optimizing Color Flow
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Direction 2300002-100 Rev. 2
Directional Power Doppler
You can select the P7 Directional Power Doppler map while in 
PDI. 
NOTE:  If you store a PDI image and recall it, you can still switch to the 
Directional Power Doppler map and vice versa. However, an 
image stored as non-directional then switched to directional just 
adds direction to a non-directional map and vice versa. 
HINTSIf the image is aliasing, increase the PRF and reduce the Wall...

Optimizing the Image
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Optimizing Spectral Doppler
Intended Use
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. 
Typical Use - PW Doppler
In Pulsed Wave Doppler (PW) Mode, energy is transmitted from 
the ultrasound probe into the patient, as in B-Mode. However, 
the received echoes are...

Optimizing Spectral Doppler
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Typical exam protocol
A typical examination using PW Doppler Mode might proceed as 
follows: 
1.  Connect the appropriate probes, leaving the probes in their 
respective holders. 
2.  Position the patient for the examination. 
3. Press Patient. Enter the appropriate patient data using the 
appropriate exam category and worksheet. 
4.  Engage the probe to be used by lifting it out of its holder. 
5.  Locate the anatomy...

Optimizing the Image
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Typical exam protocol (continued)
12.  Record results by pressing P1 - P4, depending on the setup 
of your recording devices. 
13. Press Freeze to resume imaging. 
14.  Repeat the above procedure until all relevant flow sites have 
been examined. 
15.  Replace the probe in its respective holder. 
Activating CW/PW Doppler Mode
To activate CW or PW Doppler Mode, press CW or PW. 
The Doppler spectrum displays along with the...

Optimizing Spectral Doppler
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Doppler Display
Time zero (the start of the trace) appears on the left side of the 
graph. As time progresses, the trace moves to the right. The 
baseline of the graph (representing zero velocity, zero frequency 
shift, or no detected flow), appears as a solid line running 
horizontally across the display. By convention, movement 
toward the probe is positive and movement away from the probe 
is negative. Positive...

Optimizing the Image
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Doppler Mode Display
 Figure 5-15. Doppler Mode Display
Table 5-3: Doppler Mode Display Explanations
Doppler DisplayDescription, Format, Values
PRF Pulse repetition frequency, displayed as PRF in kHz. 
Wall Filter Wall filter size, displayed as WF in Hz. 
Doppler Gain* Displays asGN in decibels (db). 
Sample Volume 
DepthDisplays (in Cm) when Doppler cursor is present.  
Doppler Angle
 (AC ##)Indicates angle in degrees...