GE Vivid 7 Service Manual

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
Chapter 4 - Functional Checks 4 - 47
4-3-8-7 Check Sample Volume and Tissue Priority
 
Table 4-16    Color Flow Mode: Check Variance, Color Maps and Cineloop
StepTask Expected Result(s)
9. Adjust Variance Controls the amount of variance data added to a color 
display. 
Variance enables computer-aided detection of non-
luminary flow (e.g. jets or regurgitation). 
Variance is available in live and cine replay.
10. Select Color Maps Displays a menu of color map options. 
Use the trackball to point to a color map and press 
SELECT to activate the desired color map. 
Each color map is assigning different color hues to 
different velocities.
11. Make Cineloop (in Freeze, Color 2D mode only)
Starts cine loop acquisition. 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
4 - 48 Section 4-3 - Functional Checks
4-3-8-8 Check Frequency, Radial Av eraging, Lateral Averaging, Power
   
4-3-8-9 Adjust ROI
 
Table 4-17    Color-Mode Soft Menu Controls Check
StepTaskExpected Result(s)
1. Adjust Frequency
Enables the adjustment of the transmission frequency to 
control the sensitivity or the level of penetration. 
The selected frequency is displayed in the status 
window.
Adjusting Frequency may affect Sample Volume and 
LVR settings.
2. Adjust Radial Averaging Smooths the image by averaging collected data along 
the same radial line. 
An increase of the radial averaging will reduce noise, but 
this will also reduce the radial resolution.
3. Adjust Lateral Averaging (Color 2D only) Smooths the image by averaging collected data along 
the same horizontal line. 
An increase of the lateral averaging will reduce noise, 
but this will also reduce the lateral resolution.
4.Adjust Power
Controls the amount of acoustic power applied in all 
modes. 
When power is set to maximum, it is equal to or less than 
the maximum acoustic power permitted by the FDA. 
The Thermal Index (TI) and the Mechanical Index (MI) 
are displayed on the screen.
Table 4-18    Adjust ROI
StepTaskExpected Result(s)
1. Adjust Sample volume Adjusts the size of the color flow Doppler sampling area. 
Lower setting gives better flow resolution while a higher 
setting increases sensitivity and helps to locate 
disturbed flows. 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
Chapter 4 - Functional Checks 4 - 49
4-3-9 Doppler Mode Checks
4-3-9-1 Introduction Doppler is used to measure velocity (most often in blood).
Doppler mode can be done with a special pencil probe  or with an ordinary probe. By using an ordinary 
probe, you can first bring up a 2D picture  for navigation purpose and then add Doppler.
4-3-9-2 Preparations Use a phantom when doing these tests.
1.) Connect one of the probes, to the  scanner’s left-most probe connector. 
-See  Probe Connection , page 3-21 for info about connecting the probes
-See  Section 9-26 Probes on page 9-80  for available probes
2.) Turn ON the scanner -See  4-2-2 - Power ON/ Boot UP  on page 4-3 for info about booting the scanner.
The 2D Mode window is displayed (default mode).
3.) If needed, adjust the Display’s  Brightness and Contrast setting. 
4.) Press PW or CW to start  Pulsed Wave Doppler (PW) or  Continuous Wave Doppler (CW).
5.) Use the trackball to select the Area of Interest (S ample Volume) in PW or direction of interest in CW. 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
4 - 50 Section 4-3 - Functional Checks
4-3-9-2      Preparations (cont’d) Figure 4-32   Doppler Mode Controls
Gain * Mode Dependant Keys
Horizontal Sweep 
*
Velocity Range
Baseline  *
LVR
Invert  *
LPRF (in PW mode only)
Color Maps  *
Soft menu
Sample Vol. (PW)
Compress *
Reject  *
Frequency
Frame Rate
Angle Corr.  *
Power
CW
Freeze
PW
Zoom
Display zoom
HR zoom
Controls marked with * (asterisk) are  also available in freeze and cine replay 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
Chapter 4 - Functional Checks 4 - 51
4-3-9-3 Check Horizontal Sweep, Velocity  Range, Baseline and Low Velocity Reject 
 
Table 4-19    Doppler Mode Controls Checks
StepTaskExpected Result(s)
1. Adjust HORIZONTAL SWEEP
Adjusts the horizontal refresh rate of the Doppler area 
of the display. 
Horizontal sweep is available in live and cine replay.
2. Adjust VELOCITY RANGE
Enables the vertical scale  of the Doppler spectrum and 
the maximal detectable velocity to be modified. 
Velocity range directly controls the pulse repetition 
frequency, which is responsible for the setting of the 
Nyquist limit (the ability to  detect maximal velocity 
without aliasing).
3. Move BASELINE
Enables the Doppler baseline to be shifted up and 
down. 
The default Doppler baseline is set at the center of the 
vertical aspect of the Doppler display, dividing evenly 
the flow toward and away from the probe. 
By adjusting the baseline a larger portion of the analysis 
is assigned to the flow direction present. 
Baseline is available in live and cine replay.
4.Adjust Low Velocity Reject ( LV  R E J.)Enables the low velocity port ions of the spectrum to be 
filtered, since the Doppler spectrum and audio may 
contain strong wall-motion signals. 
The amount of LV Rej. is indicated by the green vertical 
bar at the right end of the baseline.  
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
4 - 52 Section 4-3 - Functional Checks
4-3-9-4 Check Invert, LPRF (in PW only) and Color Maps
  
Table 4-20    Doppler Mode Controls Checks
StepTaskExpected Result(s)
5. Press  INVERT 
Enables the Doppler spectrum to be flipped 180 
degrees, so that negative velocities are displayed 
above the baseline and positiv e velocities below the 
baseline. 
Invert is available in live and cine replay.
6. Press  LPRF
 
In PW, adjusts the pulse r epetition frequency for the PW 
Doppler acquisition of data flow.
7. Choose  COLOR MAPS
Displays a drop down menu of different Doppler 
colorization maps.
Use the trackball to select the desired map and press 
Select to activate the map. 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
Chapter 4 - Functional Checks 4 - 53
4-3-9-5 Check Sample Volume, Co mpress, Reject and Frequency
  
Table 4-21    PW/CW Doppler Mode: Check Sample Volume, Compress, Reject and Frequency
StepTask Expected Result(s)
1. Adjust SAMPLE VOLUME (SV)
  In PW mode, set the longitudinal size of the region to 
be sampled for measurement. 
Adjusting Sample volume may affect the PRF (Nyquist 
limit) settings. 
SV does not apply to CW mode, where the volume 
sampled is the full length of the area indicated by the 
cursor line.
2. Change  COMPRESS
 
Enables control over the contrast of the Doppler 
spectrum. 
When compression is raised, the spectrum image 
becomes softer and some low level background noise 
may appear. 
Compress is available in both Live and Freeze.
3. Adjust  REJECT
 
Enables undesirable backgr ound noise to be removed 
from the Doppler spectrum resulting in a darker 
background. 
Reject is available in both Live and Freeze.
4.Change  FREQUENCY
Adjusts the transmission frequency in Doppler to 
control sensitivity or level of penetration.
The selected frequency is displayed in the status 
window.
Adjusting Frequency may affect Sample Volume (PW) 
and LVR settings. 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
4 - 54 Section 4-3 - Functional Checks
4-3-9-6 Check Frame Rate, Angle Correction and Power
 
Table 4-22    PW/CW Doppler Mode: Che ck Frame Rate, Angle Correction and Power
StepTask Expected Result(s)
1. Adjust FRAME RATE 
Adjusts frame rate.
The relative setting of the frame rate is displayed in the 
status window (under 2D).
2. Adjust  ANGLE CORRECTION
 
Enables correction of the  Doppler velocity scale by 
defining the angle between the Doppler beam and the 
investigated blood vessel. 
A thin cross bar on the Doppler cursor will rotate as the 
control is adjusted.
Angle correction is avail able in both Live and Freeze.
3. Adjust  POWER
 
Controls the amount of acoustic power applied in all 
modes. 
When power is set to maximum, it is equal to or less 
than the maximum acoustic power permitted by the 
FDA.
The Thermal Index (TI) and the Mechanical Index (MI) 
are displayed on the screen. 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
Chapter 4 - Functional Checks 4 - 55
4-3-10 4D Volume Rendering Test
Do a 4D functional check. The  4D and Multi-plane Imaging manual  explains how to use the 4D 
function. The manual is include d on the Vivid 7 Manual CD.
Follow these steps to test the basic 4D functionality:
1.) Select the 3V probe.
2.) Create an examination.
3.) Press  4D on the Operator Panel. The 4D Volu me Rendering screen is displayed.
4.) Adjust the  Width control so that the structure of interest is within the scanning volume. 
1.) Volume rendering display from cut-plane 1 (yellow). 
The volume rendering may be adjusted by rotating and translating the cut-plane 1.
2.) Cut-plane 2 (white): 2D image in the azimuth plane.
3.) Cut-plane 3 (green): 2D image in the elevation plane.
4.) Geometric model: displays a three-dimensional model with cut-planes position and  orientation.
5.) Color coded cut-plane markers indicate  the other cut-planes position relative to 
the displayed cut-plane.
6.) View direction marker.
7.) Soft menu controls.
8.) Trackball functions. Figure 4-33   4D Volume Rendering screen 
						

							
GE HEALTHCARE
DIRECTION FC091194, REVISION 11    VIVID 7 SERVICE MANUAL 
4 - 56 Section 4-3 - Functional Checks
4-3-10 4D Volume Rendering Test (cont’d)
5.) Using the trackball rotate and translate the volume rendering to display the structure of interest as  described in the section below. Press  Angle to get a pre-defined orientation before translating and/
or rotating the volume rendering. If necessary, press  Clear to reset the orient ation to the default 
position.
6.) Optimize the volume rendering using  4D Gain, Shading  and Smoothness  controls.
7.) If desired, zoom in the area of interest.
8.) If desired, press  Layout to display the volume rendering in a single screen.
9.) If necessary, use  Crop tool to remove unwanted structures.
10.) Select  Img. Store  to save the acquisition.