GE Vivid 7 Service Manual
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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.