GE M
EDICAL
S
YSTEMS
PROPRIETARY
TO
GE
D
IRECTION
2294854-100, R
EVISION
3
LOGIQ™ 9 P
ROPRIETARY
M
ANUAL
Chapter 4 Functional Checks
4-9
4-3-5
System CFM and PWD Checks
Frame Rate/Resolution
Optimizes B Mode frame rate or spatial resolution for the best
possible image.
B Flow
Provides intuitive representation of non-quantitative
hemodynamics in vascular structures.
Sensitivity/PRI
Adjusts the sample rate for the flow signal.
Background On/Off
Background On lets you view the anatomy roadmap;
Background Off lets you view just flow information.
Sweep Speed
Changes the speed at which the timeline is swept.
Figure 4-9 CFM and PWD Functions
Table 4-4
CFM and PWD Functions
Baseline
Adjusts the baseline to accommodate faster or slower blood
flows to eliminate aliasing.
PRF/Wall Filter
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.
Angle Correct
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
Threshold
Threshold assigns the gray scale level at which color
information stops.
Map
Allows a specific color map to be selected. After a selection has
been made, the color bar displays the resultant map.
Invert
Allows blood flow to be viewed from a different perspective, i.e.
red away (negative velocities) and blue toward (positive
velocities). The real-time or frozen image can be inverted.
Table 4-3
B/M-Mode Functions
