GE H
EALTHCARE
RAFT
V
OLUSON
E8 / V
OLUSON
E6
D
IRECTION
KTD102576, R
EVISION
7
DRAFT (A
UGUST
23, 2012)
S
ERVICE
M
ANUAL
4-16
Section 4-4 - Functional Checks
4-4-4
Spectral Doppler Mode Checks
NOTE:
Different menus are displayed depending on which Spectral Doppler Mode (PW or CW) is selected.
NOTE:
The Continuous Wave Doppler Mode is an Option. The
CW
key is only illuminated if the option is
installed and the selected probe is capable for the Continuous Wave Doppler Mode.
For further details refer to the Voluson E8 / Voluson E6 Basic User Manual.
Figure 4-14 PW Main and PW Sub Menu
Table 4-4
Spectral Doppler Mode (PW, CW) Functions
Step
Task
Expected Results
1
Gate Position and Gate Size
Adjust the Gate- Position resp. Size with the
TRACKBALL
in the 2DSingle image.
The
upper trackball key
changes from Gate position to Gate size.
2
Activation of Doppler Mode
Press the
right trackball key
to activate the motion display.
Press the
left trackball key
to activate both Modes (B/D).
3
Doppler Gain
Rotate the
PW MODE
key to adjust the amplification of the entire spectrum.
4
STEERING
The steering function is only available with linear probes.
5
SPEED
By touching up or down, four different sweep speeds can be selected.
6
RT TRACE (Real Time Auto-Trace)
The envelope curve of the Doppler spectrum (maximum velocities) and the
corresponding evaluations are automatically displayed on the monitor.
7
Display Format
Doppler spectrum is displayed below the B mode image or on its right side.
8
INVERT
To invert the Doppler spectrum display in relation to the direction of the flow.
9
ANGLE
The angle cursor can be turned in both directions without stop. By pressing the
angle knob repeatedly the angle correction switches from +60° to 0° and to -60°.
10
BASELINE
Adjusting the baseline is possible in read- and write Mode (up/down in 8 steps).
11
WMF
(Wall Motion Filter)
Used to eliminate Doppler “noise” that is caused by vessel wall motion.
12
PRF
The Velocity Range display is governed by the pulse repetition frequency (PRF)
Exceeding the maximum PRF, the HPRF-Mode is automatically switched on.
13
DYN. CONTR.
Dynamic Range adjusts the display cutoff of the Doppler analysis waveform.
14
CENTER FREQUENCY
It serves for selection of the required transmit frequency.
15
SCALE UNIT
To select the displayed measuring system (in relation to the zero-line).
16
DISPLAY FORMAT
For selection of different rations of display format.