GE Vivid 7 User Manual
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Contrast Imaging Vivid7/Vivid7 PRO Users Manual197 FC092326-03 MC Contrast controls MC Contrast assignables controls Horizontal sweep Adjust the refresh rate of the ECG. ECG Trig 1 Specifies the delay (ms) from R-wave to the triggered frame. ECG Trig 2 Specifies the delay (ms) from R-wave to the second frame. Tr i g 2 must be greater than Tr i g 1 for dual triggering to be active. ECG Trig Interval Controls the number of cardiac cycles between triggered images. Simultaneous Enables simultaneous display of 2D B-mode and 2D Angio Color mode. ECG Trig Enables intermittent imaging based on the ECG. Angio Turns Coded harmonic angio (color) on/off. Color Maps Displays a Color map menu to optimized the color presentation. Frequency Enables the adjustment of the probes operating frequency. A higher frequency gives better resolution. Focus Changes the location of the focal point. A triangular marker on the depth scale along the image sector indicates the position of the focal point.
Contrast Imaging 198Vivid7/Vivid7 PRO Users Manual FC092326-03 MC Contrast Soft menu controls (2D Angio mode) Power Controls the amount of acoustic power applied to the transmitted pulse. Color threshold Too high a Power level will destroy the contrast agent.Controls the level of greyscale intensity that is used as a threshold for color overlay. PRF (Pulse Repetition Frequency) Adjusts the repetition rate of the Doppler pulses transmitted to acquire the data for color mapping. Lower frame rates give better resolu- tion.Frame rate Controls the line density. Low Velocity Reject Controls the extend of low velocity removal. Sample volume Controls the size of the color angio area. Adjustment of the Sample volume may affect the PRF setting. Radial Averaging Smooths the image by averaging the data collected along the same radial line. Lateral Averaging Smooths the image by averaging data collected along the same lateral line. An increase of the lateral averaging will reduce noise, but will also reduce the lateral resolution. DDP (Data Dependant Processing) Performs temporal processing, which reduces random noise without affecting the motion of significant tissue structures. Trackball controls ROI (Region Of Interest) size When the trackball command Size is selected (see also ’Trackball operation’ on page 59), the height and width of the color area is adjusted by rolling the trackball (up/down, right/ left).
Contrast Imaging Vivid7/Vivid7 PRO Users Manual199 FC092326-03 ROI (Region Of Interest) position When the trackball command Pos (position) is selected (see also ’Trackball operation’ on page 59), the position of the color area is adjusted by rolling the trackball.
Contrast Imaging 200Vivid7/Vivid7 PRO Users Manual FC092326-03 Running MC Contrast The MC Contrast application works only with the M3S, 3S and 5S probes. To select MC Con- trast application without changing the current probe, press APPL. on the control panel. 1. Press PROBE on the control panel. A list of the connected probes is displayed. 2. Trackball to the desired probe supporting the MC Contrast application. The Application menu for the selected probe is listed. 3. Trackball to LV Contrast application. 4. Press SELECT to launch the application. 5. Press the assignable ANGIO. 6. Press the assignable ECG TRIGGING. 7. Press PHYSIO. The ECG trigging control menu is displayed (see page 195). 8. Adjust the Tr ig 1 using the Soft menu Rocker. The delay (ms) is displayed in the Status window (see Figure 5-3, page 195). For dual triggering, Trig 2 must be greater than Trig 1.9. Adjust Tri g 2 if dual trigging is used. 10. Press PHYSIO again to close the menu. 11. Adjust Trig interval from the Assignable keys. The number of heart cycles between the frame acquisition is displayed in the MC Contrast Status window under Triggering (Every (HB)). A triggering inter- val from 1:3 to 1:5 is recommended for adequate contrast filling in normal re- gions.12. Adjust Active Gain from the Control Panel. 13. If desired, press the SIMULTANEOUS assignable to prompt a dual screen for side by side display of 2D B-mode and 2D Angio mode. 14. Acquire the baseline images. 15. Press IMAGE STORE to save the baseline acquisition. The contrast solu- tion should be pre- pared just before injection.16. Prepare the Contrast agent as described by the manufacturer. 17. Administrate the Contrast agent. 18. Acquire the contrast images. 19. Press FREEZE. 20. Press CINELOOP.
Contrast Imaging Vivid7/Vivid7 PRO Users Manual201 FC092326-03 See also page 62 about cineloop oper- ation.21. Select Left marker and Right marker frames to define the cineloop to transfer. 22. Press IMAGE STORE to save the contrast acquisition. Optimizing MC Contrast • A good baseline image is the key for successful myocardial contrast imaging. Using Coded Harmonic Angio, no colors should be found in the myocardium at baseline. • The ECG triggering position should be adjusted to avoid wall motion artifacts. • A triggering interval from 1:3 to 1:5 should be used to allow for adequate contrast filling in normal regions. • If there is poor contrast in a particular region adjust the focus to this depth. • If there is too much filling or blooming, decrease the contrast dose or concentration (if attenuation appears) or decrease the sample volume size
Contrast Imaging 202Vivid7/Vivid7 PRO Users Manual FC092326-03 Real-Time Myocardial Contrast Imaging Real-Time Myocardial Contrast (RTMC) is intended for visualization of myocardial perfusion by use of ultrasound contrast agents. As opposed to MC Contrast, RTMC performs myocardial contrast imaging in a non-triggered mode. WARNINGThis application is intended for clinical research only. Diagnosis must not be based on results achieved by contrast analysis alone.
Contrast Imaging Vivid7/Vivid7 PRO Users Manual203 FC092326-03 RTMC over view Figure 5-5: The RTMC Contrast acquisition screen 1. Sample volume 2. Status window: 3. Soft menu Controls marked with R are also available in freeze and cine replay.
Contrast Imaging 204Vivid7/Vivid7 PRO Users Manual FC092326-03 Figure 5-6: The RTMC controls on the front panel 1. Application 2. Probe 3. Gain R 4. Assignable keys: • Frequency • Focus • Flash • Flash frames • Flash gain • Simultaneous • Angio • Color maps R • Cineloop (in Freeze) • Flash power • 2D width • ECG trig 5. Soft menu • Power • Frame rate • Color threshold • PRF • Low velocity reject • Sample volume • Radial average • Lateral average • DDP R • 6. Trackball Controls marked with R are also available in freeze and cine replay 4 5 3 1 2
Contrast Imaging Vivid7/Vivid7 PRO Users Manual205 FC092326-03 RTMC controls RTMC Contrast assignables controls Frequency Enables the adjustment of the probes operating frequency. A higher frequency gives better resolution. Focus Changes the location of the focal point. A triangular marker on the depth scale along the image sector indicates the position of the focal point. Flash Enables the transmission of a pulse with the maximum allowed power over a given time. The purpose of the Flash function is to destroy all contrast agent in the scan plane to create an “artificial” baseline image. The actual MI is displayed in the Scanner Title bar. Flash frames Controls the length of the Flash specified in number of frames. The duration of the Flash depends on the actual frame rate. Flash gain Controls the (receive) gain of the Flash separately. Simultaneous Enables simultaneous display of 2D B-mode and 2D Angio Color mode. Angio Turns Coded harmonic angio (color) on/off. Color Maps Displays a Color map menu to optimize the color presentation. 2D Width Controls the size and angular width of the image sector. A smaller angle generally produces a scan with a higher frame rate. ECG Trig Enables intermittent imaging based on the ECG.
Contrast Imaging 206Vivid7/Vivid7 PRO Users Manual FC092326-03 Flash power Controls the power (amplitude) of the Flash. The maximum allowed power is default. RTMC Soft menu controls Power Controls the amount of acoustic power applied to the transmitted pulse. Too high a Power level will destroy the contrast agent.Color threshold Controls the level of greyscale intensity that is used as a threshold for color overlay. PRF (Pulse Repetition Frequency) Adjusts the repetition rate of the Doppler pulses transmitted to acquire the data for color mapping. Frame rate Lower frame rates give better resolu- tion.Controls the line density. Low Velocity Reject Controls the extent of low velocity removal. Sample volume Controls the size of the color angio area. Adjustment of the Sample volume may affect the PRF setting. Radial Averaging Smooths the image by averaging the data collected along the same radial line. Lateral Averaging Smooths the image by averaging data collected along the same lateral line. An increase of the lateral averaging will reduce noise, but will also reduce the lateral resolution. DDP (Data Dependant Processing) Performs temporal processing, which reduces random noise without affecting the motion of significant tissue structures.