GE Voluson E8 Service Manual page 152

GE H RAFT
EALTHCARE
D KTD102576, R
IRECTION
4-4-4 Spectral Doppler Mode Checks
NOTE: Different menus are displayed depending on which Spectral Doppler Mode (PW or CW) is selected.
The Continuous Wave Doppler Mode is an Option. The CW key is only illuminated if the option is
NOTE:
installed and the selected probe is capable for the Continuous Wave Doppler Mode.
Table 4-4
Step
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
For further details refer to the Voluson E8 / Voluson E6 Basic User Manual.
4-16
7 DRAFT (A
EVISION
Figure 4-14 PW Main and PW Sub Menu
Spectral Doppler Mode (PW, CW) Functions
Task
Gate Position and Gate Size
Activation of Doppler Mode
Doppler Gain
STEERING
SPEED
RT TRACE (Real Time Auto-Trace)
Display Format
INVERT
ANGLE
BASELINE
WMF (Wall Motion Filter)
PRF
DYN. CONTR.
CENTER FREQUENCY
SCALE UNIT
DISPLAY FORMAT
Section 4-4 - Functional Checks
23, 2012)
UGUST
Expected Results
Adjust the Gate- Position resp. Size with the TRACKBALL in the 2DSingle image.
The upper trackball key changes from Gate position to Gate size.
Press the right trackball key to activate the motion display.
Press the left trackball key to activate both Modes (B/D).
Rotate the PW MODE key to adjust the amplification of the entire spectrum.
The steering function is only available with linear probes.
By touching up or down, four different sweep speeds can be selected.
The envelope curve of the Doppler spectrum (maximum velocities) and the
corresponding evaluations are automatically displayed on the monitor.
Doppler spectrum is displayed below the B mode image or on its right side.
To invert the Doppler spectrum display in relation to the direction of the flow.
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°.
Adjusting the baseline is possible in read- and write Mode (up/down in 8 steps).
Used to eliminate Doppler "noise" that is caused by vessel wall motion.
The Velocity Range display is governed by the pulse repetition frequency (PRF)
Exceeding the maximum PRF, the HPRF-Mode is automatically switched on.
Dynamic Range adjusts the display cutoff of the Doppler analysis waveform.
It serves for selection of the required transmit frequency.
To select the displayed measuring system (in relation to the zero-line).
For selection of different rations of display format.
V E8 / V
OLUSON OLUSON
S M
ERVICE ANUAL
E6