GE HEALTHCARE - KRETZTECHNIK VOLUSON® 730EXPERT (BT03)
D
IRECTION 105899, REVISION 3 DRAFT (APRIL 29, 2008) SERVICE MANUAL
4-14 Section 4-4 - Functional Checks
For further details refer to the Voluson® 730Expert Basic User Manual:
• Chapter 8, CFM Mode (Color Flow Mode)
• Chapter 9, PD Mode (Power Doppler Mode)
• Chapter 10, TD Mode (Tissue Doppler Mode)
8
WMF
(Wall Motion Filter)
Used to eliminate Doppler “noise” that is caused by vessel wall or cardiac wall motion.
(CFM,PD)
9
PRF
By touching toward up the PRF increases. By touching toward the PRF decreases.
10
THRESHOLD
After FREEZE you can adjust the Color Threshold. It eliminates small color noise or motion
artifact signals in the color image. (small number cuts off less signals than a higher setting)
11
DISPL. M To select the CFM- Display Mode (V; V-T; V-Pow; Pow-T; or T).
12
SMOOTH
To select different filter periods for rising velocity and falling velocity.
RISE
Filtering of the rise velocity leads to noise suppression.
FALL
This filter leads for “prolongation” of the display flow.
13
FREQU.
It serves for selection of the Transmit Frequency which also depends on the Color Box
position.
14
ENSEMBLE
Controls the number of pulses to constitute one Color- or Power-Doppler line in the display.
15
FLOW RES.
This function controls the axial resolution of color in the display.
It adjusts the axial sample depth of color pixels.
16
LINE DEN
Determines the line density within the Color-Box.
The lower the line density, the larger the line distance and the size of the color pixels.
17
SCALE (CFM, TD) The maximum velocities are displayed above and under the color scale in kHz, cm/s or m/s.
18
CFM-MAP (PD, TD)
Provides selectability of the color coding for an optimization of the display of blood flow (similar
to the post-processing curves with grayscale 2D scans).
After a selection has been made, the color bar displays the resultant map.
19
GENTLY COLOR
Gently means the transition between color and gray scale information.
The embedding of the color into 2D Mode is performed smoothly with less colored splashes.
To activate the “Gently Color” function, touch the CFM MAP
(PD, TD) key in the Submenu.
20
BALANCE
The Balance controls the amount of Color display over bright echoes and helps to confine
color within the vessel walls.
21
ARTEFACT
(on/off) Switch on/off the artifact suppression.
22
BASELINE
The baseline shift can be used to prevent aliasing in one flow direction similar to the Doppler
baseline shift. There are 8 steps in each direction. (impossible in PD Mode)
23
LINE F.
With “Line Filter” the signals of the neighboring pulses are less weighted for the display of the
actual pulse which considerably improves the detail lateral resolution and signal-to-noise ratio.
Table 4-6 Color Doppler Mode (CFM, PD, TD) Functions
Step Task Expected Results
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