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
4-8 Section 4-4 - Functional Checks
4-4-1 2D-Mode Checks
(cont’d)
Table 4-3 2D-Mode Functions
Step Task Expected Results
1
2D-Mode Gain
Rotate the 2D-MODE key to adjust the sensitivity (brightness) of the entire
image.
2
Transmit Power
Optimizes image quality and allows user to reduce beam intensity.
3
Focus Depth
To select the depth position of the actual focus zone(s). Arrows at the left
edge of the 2D-Image mark the active focal zone(s) by their depth position.
4
Depth
Adjusts the depth range of the ultrasound image for the region of interest.
The number of image lines and the frame rate are automatically optimized.
5
Screen Format (Dual, Quad)
Press this keys to change the display Mode from Single to DUAL or QUAD
display mode.
Press the
2D-MODE key to change from Dual or Quad to Single display.
6
FFC (Focus and Frequency Composite)
FFC combines a low frequency to increase the penetration and higher
frequency to keep a high resolution.
It reduces speckle and artifacts in the 2D-image.
7
CRI (Compound Resolution Imaging)
Pulses are transmitted not only perpendicularly to the acoustic window, but
also in oblique directions. The advantages of CRI are enhanced contrast
resolution with better tissue differentiation and clear organ borders.
8
LINEAR / TRAPEZ
Advantage of the Trapezoid-Mode: The scan area is very increased in
relation to the linear display by steering the ultrasound lines in the border of
the probe.
9
Image Orientation
Use the LEFT/RIGHT respectively the UP/DOWN keys on the Touch Panel
to alternate the image orientation.
10
ANGLE
Use this control to select a part of interest of the 2D-Image. The advantage
of the decreased field-of-view is an increased 2D frame rate due to the
smaller sector width.
11
ß-VIEW
This function allows the adjustment of the Volume O-Axis position of 3D
probes in 2D-Mode. The green line in the displayed symbol indicates the
position of the acoustic block.
12
ZOOM Image magnification (Pan Zoom) in Read-/ and Write-Mode.
13
FOC. ZONES
Increases the number of transmit focal zone, so that you can tighten up the
beam for a specific area.
14
OTI (Otimized Tissue Imaging) OTI™ allows to “fine tune” the system for scanning different kinds of tissue.
15
FREQUENCY
To adjust the range of the receive frequency.
high resolution / lower penetration, mid resolution / mid penetration, or
lower resolution / high penetration
16
GRAY CHROMA MAP
A gray map determines the displayed Brightness of an echo in relationship
to its amplitude.