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
4-20 Section 4-4 - Functional Checks
4-4-7 Basic Measurements
(cont’d)
4-4-7-4 Velocity Measurements (Spectral Doppler Mode)
NOTE: The Spectral Doppler image is displayed based on time (X-axis) and velocity (Y-axis).
4-4-7-4-1 Acceleration Velocity and Velocity Ratio
1.) Press the MM key once.
2.) Select the appropriate item among D VELOCITY or D A/B.
3.) Perform the measurement(s) using the
TRACKBALL and SET (right or left trackball key).
4-4-7-4-2 Average Velocity (Manual Trace)
1.) Press the MM key once.
2.) Touch D TRACE on the Touch Panel. A cursor appears on the screen.
3.) Move the cursor with the
TRACKBALL to the start point of the measurement and press SET
(right or left trackball key) to fix the marker.
4.) Trace to the end of the period and press the SET key again to fix the mark.
The measurement results appear on the screen.
Before you complete the measurement:
To readjust the traced line, press UNDO (upper trackball key) repeatedly.
NOTE: Depending on the setting in the Measure Setup, the envelope curve will be performed with a
continuous trace line or by setting points.
4-4-7-4-3 Average Velocity (Auto Trace)
1.) Press the MM key once.
2.) Touch D AUTO TRACE on the Touch Panel.
It traces the Spectral Doppler image automatically and displays the results.
3.) Select the SENSITIVITY of the envelope curve (to eliminate artifacts).
4.) Select the TRACE MODE channel of the envelope curve (upper, both, lower).
5.) If necessary, select the Angle and the Baseline.
6.) Press the right or left trackball key to
FINISH the measurement.
Before you complete the measurement:
- To readjust the start cycle (vertical yellow line), press CHANGE (upper trackball key).
Press SET (right or left trackball key) to fix the line.
- Press the CHANGE key again to readjust the end cycle (vertical green line).
Press SET to fix the line.
NOTE: The determination of the envelope curve requires a clear and low-noise record of the
Doppler spectrum. Otherwise the reliability of the displayed measurement results may
not be ensured!