GE LOGIQ V5 Service Manual page 103

GE
D 5496012-100, R
IRECTION
Table 4-5
Control
CF/PDI Auto
Sample Volume
CF/PDI Focus
Depth
CF/PDI Frequency
CF/PDI Auto
Frequency
CF/PDI Center
Depth
PDI
TVI (Option)
TVD
3
EVISION
Color Flow Mode Controls
Possible Bioeffect
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Chapter 4 - Functional Checks
Description/Benefit
Set the default value at Utility -> Imaging -> CF Mode.
Power 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. PDI does not map
velocity, therefore it is not subject to aliasing.
Tissue Velocity Imaging (TVI) calculates and color-codes
the velocities in tissue. The tissue velocity information is
acquired by sampling of tissue Doppler velocity values at
discrete points.The information is stored in a combined
format with gray scale imaging during one or several
cardiac cycles with high temporal resolution.
TVD: Tissue Velocity Doppler: basing on TVI mode,
activate a sample volume of PW ventricular wall to get the
spectral information of the sample section.
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