GE Vivid 7 Service Manual
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GE HEALTHCARE DIRECTION FC091194, REVISION 11 VIVID 7 SERVICE MANUAL Chapter 4 - Functional Checks 4 - 57 4-3-11 Tissue Velocity Imaging (TVI) Checks 4-3-11-1 Introduction TVI calculates and color codes the velocities in tissue. The tissue velocity information is acquired by sampling of tissue Doppler veloci ty values at discrete points. 4-3-11-2 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 Probes, page 9-80 for available probes 2.) Turn ON the scanner -See 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 TVI .
GE HEALTHCARE DIRECTION FC091194, REVISION 11 VIVID 7 SERVICE MANUAL 4 - 58 Section 4-3 - Functional Checks 4-3-11-2 Preparations (cont’d) Figure 4-34 Doppler Mode Controls Mode Dependant Keys 2D Width Scale Transparency Threshold Invert * Tissue Tracking Simultaneous * Cineloop (Freeze only) Color Maps Soft menu Tissue Priority * Frame Rate Compress * Reject * Frequency Lateral Average Radial Average Baseline * Power TVI Freeze 2D Alt. Alternatives Anat. M-Mode Curved Anat. M-Mode 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 - 59 4-3-11-3 Check 2D Width, Scale, Transparency and Threshold Table 4-23 TVI Mode Controls Checks StepTaskExpected Result(s) 1. Adjust 2D WIDTH Controls the size or angular width of the 2D sector. 2. Adjust SCALE Controls the repetition rate of the Doppler pulses transmitted to acquire the data for color mapping. The scale value influences the Nyquist limit (the ability to detect maximal velocity without color aliasing. 3. Adjust TRANSPARENCY Controls the degree of transparency of the TVI color. 4.Adjust THRESHOLD. Controls the level of greyscal e intensity that is used as a threshold for color.
GE HEALTHCARE DIRECTION FC091194, REVISION 11 VIVID 7 SERVICE MANUAL 4 - 60 Section 4-3 - Functional Checks 4-3-11-4 Check Invert, Tissue Tracking, Simultaneous and Color Maps Table 4-24 TVI Mode Controls Checks St e pTa s kExpected Result(s) 5. Press INVERT Enables the color scheme assigned to positive and negative tissue velocities to be inverted. Invert is available in live and cine replay. 6. Press TISSUE TRACKING Starts Tissue Tracking mode. 7. Choose COLOR MAPS Displays a drop down menu of different 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 - 61
4-3-11-5 Check Tissue Priority, Frame Rate, Compress, Reject, Frequency, Lateral & Radial Average, Baseline and Power
Table 4-25 TVI Mode: Soft Menu Controls Check
StepTask Expected Result(s)
8. Adjust TISSUE PRIORITY
Emphasizes either the color of the TVI or the greyscale
tissue detail of the 2D image.
Tissue priority is avail able in both Live and Freeze.
9. Adjust FRAME RATE
Controls the line density. When adjusting frame rate,
there is a trade off between spatial and temporal
resolution.
10. Adjust COMPRESS
Controls the amount of color compression. The color
bar is adjusted accordingly.
11.Adjust REJECT
Adjust the cut-off level for the low velocity of TVI to be
discarded when generating the color image.
12.Adjust FREQUENCY
Enables the adjustment of the transmission frequency
to control the sensitivity or the level of penetration.
GE HEALTHCARE DIRECTION FC091194, REVISION 11 VIVID 7 SERVICE MANUAL 4 - 62 Section 4-3 - Functional Checks 13.Adjust LATERAL AVERAGE 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. 14. Adjust RADIAL AVERAGE 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. 15. Adjust BASELINE Adjusts the color map to emphasize tissue motion either toward or away from the probe. Baseline is available in both Live and Freeze. 16. 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 level permitted by regulatory standards. The Thermal Index (TI) and the Mechanical Index (MI) are displayed on the screen. Table 4-25 TVI Mode: Soft Menu Controls Check StepTask Expected Result(s)
GE HEALTHCARE DIRECTION FC091194, REVISION 11 VIVID 7 SERVICE MANUAL Chapter 4 - Functional Checks 4 - 63 4-3-12 Contrast Checks Refer to Chapter 5 in Vivid 7 User Manual. 4-3-13 Stress Echo Refer to Chapter 4 in Vivid 7 User Manual.
GE HEALTHCARE DIRECTION FC091194, REVISION 11 VIVID 7 SERVICE MANUAL 4 - 64 Section 4-3 - Functional Checks 4-3-14 Measurements and Multi Image Checks 4-3-14-1 Introduction to Measurements & Analysis (M&A) • A complete M&A software package for Cardiac is included in the Vivid 7. • The M&A software runs on the Back-End Processor. • In this test, we just check one measurement, Calipers. 4-3-14-2 Preparations, M&A Figure 4-35 Measurement Keys Table 4-26 Measurement Key Checks StepTask Expected Result(s) 1. Generate a 2D image (see 4-3-6 - 2D Mode (B mode) Checks for details).A 2D image is active on the screen 2. Press FREEZE on the Operator Panel The last scanned picture is on the screen. 3. Scroll back until you find the picture you want to do the measurement on. The picture of interest is on the screen. F 1F 2F 3F 4 Measure Assign and Measure Measure and Assign Caliper Measure and Assign (when in measure mode)) Menu Fast access to the Measurement menu (when in measure mode)
GE HEALTHCARE DIRECTION FC091194, REVISION 11 VIVID 7 SERVICE MANUAL Chapter 4 - Functional Checks 4 - 65 4-3-14-3 Check Caliper Measurement, Distance 4-3-14-4 Check Post-measurement assignment labels Table 4-27 Measurement Key Checks StepTask Expected Result(s) 4. Press MEASURE on the Operator Panel. Select Caliper in the Measurement menu. or Press CALIPER on the Operator Panel. Press the CALIPER mode dependant button The Measurement menu with a list of studies is displayed in the Parameters window on the screen. When entering the Measurement mode for the first time, the Caliper tool is selected by default. When re-entering the Measurement mode, the first measurement in the actual study that has not been performed is selected by default. 5. Use the Trackball to move the cursor to the start point of the measurement. The cursor points to the start point for the measurement. 6. Press SELECT to anchor the start point of the measurement. The start point of the measurement is marked, and a line between the mark and the active cursor indicates the distance. 7.Use the trackball to move the cursor to the end point of the measurement.The current distance value is displayed in the Measurement result table and is instantaneously updated when moving the cursor. 8. Press SELECT to mark the end point for the measurement. The measurement display color on the 2D image changes from green to red after completion of the measurement. The measurement result is displayed in the Measurement result table. 9.Trackball to the measurement result in the Measurement result table.The highlighted parameter label is assigned to the measurement. Table 4-28 Post-measurement assignment labels StepTask Expected Result(s) 10. Trackball to the actual measurement in the Measurement Result Window. Press SELECT on the Operator Panel. A Parameter menu is displayed. 11. Trackball through the Parameter label menu to highlight the desired label. Press SELECT on the Operator Panel. The highlighted parameter label is assigned to the measurement.
GE HEALTHCARE DIRECTION FC091194, REVISION 11 VIVID 7 SERVICE MANUAL 4 - 66 Section 4-3 - Functional Checks 4-3-15 Multi Image Checks 4-3-15-1 Introduction to Multi Image This unit has a special function for displaying tw o or four examination pictures at the same time 4-3-15-2 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 Probes, 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). If needed, adjust the Display’s Brightness and Contrast setting. 3.) Store four cineloops. 4-3-15-3 1,2,4 Key Check Table 4-29 Use of Multi Image Key KeyDescription Enables multiple image display windows in which tw o or four images can be viewed simultaneously. When reducing the number of images, the active window will always be kept. Table 4-30 Multi Image Checks StepTaskExpected Result(s) 1. Press the 1,2,4 Key once to display two images on the screen. 2 Images are displayed on the screen. 2. Press the 1,2,4 Key once more to display four images on the screen. 4 Images are displayed on the screen. 3. Press the 1,2,4 Key again to reduce the number of images on the screen. 1 image is displayed on the screen. 1/2/4