GE Voluson 730, Руководство по обслуживанию

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GE M
EDICAL
S
YSTEMS
- K
RETZTECHNIK
U
LTRASOUND
D
IRECTION
105844, R
EVISION
1 V
OLUSON
® 730 S
ERVICE
M
ANUAL
Chapter 4 Functional Checks 4-11
4-4-3 Spectral Doppler Mode Checks
For further details refer to the Voluson® 730 Basic User Manual, Chapter 7, Spectral Doppler Mode.
Figure 4-9 PW Main- and PW Sub Menu
Table 4-5 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 B-Single 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
INVERT To invert the Doppler spectrum display in relation to the direction of the flow.
8
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°.
9
BASELINE Adjusting the baseline is possible in Read- and Write-Mode (up/down in 8 steps).
10
WMF (Wall Motion Filter) Used to eliminate Doppler “noise” that is caused by vessel wall motion.
11
VEL. RANGE respectively PRF
The Velocity Range display is governed by the pulse repetition frequency (PRF)
Exceeding the maximum PRF, the HPRF-Mode is automatically switched on.
12
DYN. Dynamic Range adjusts the display cutoff of the Doppler analysis waveform.
13
REJECT Low echo information below the adjusted reject level will not be displayed.
14
CENTER FREQUENCY It serves for selection of the required transmit frequency.
15
SCALE To select the displayed measuring unit (in relation to the zero-line).
16
FORMAT For selection of either one of three formats.