• SIGNA™ Hero 3.0T Service Methods
  • 5852800-8EN Revision 1.0
  • Object ID: 00000018WHA30FB62GYZ
  • Topic ID: id_2001437 Version: 11.3
  • Date: Oct 5, 2021 10:15:03 AM

Adjusting RF amplifier output power for body channel 1

Procedure

  1. On the front of the exciter, make sure the RF ENB switch is set to the enabled (up) position.
    Figure 1. Exciter switch
  2. Press Landmark and then Advance to Scan. A phantom is not needed.
  3. Start the RF Amp & Power Monitor Calibration tool:
    • (For non-proprietary mode in system running PX29.0 or earlier) On the Common Service Desktop, select Calibration > UPM Tool and Click here to start this tool.
    • (For non-proprietary mode in systems running PX29.1 or later) On the Common Service Desktop, select Calibration > RAP Tool and Click here to start this tool.

    Result

    The UPM/RF Amp & Power Monitor Calibration tool opens (a UPM event log also opens).
  4. Select values for the following settings within the tool:
    Figure 2. UPM body mode channel 1 settings

    (For system running PX29.0 or earlier)

    SettingValue
    Nuclei1H
    TaskLaunch RF Cal
    RF ChainBody Channel 1
    Note: The Power Type drop-down menu is inactive for this step.
    Figure 3. RF Amp and Power Monitor (RAP) Tool body mode channel 1 settings

    (For system running PX29.1 or later)

    SettingValue
    TaskCalibrate RF Amplifier
    RF ChainBody Channel 1
  5. Click Start.
  6. When a dialog box shows asking if the system is properly set up, click Yes.

    Result

    The system sets the proper sequence for RF calibration. This process takes about 1 minute.
  7. When a dialog box shows, do not click Success or Failure at this time. Instead, navigate to the Scan Desktop.
    Figure 4. RF Amp Calibration dialog box
  8. From the Scan Desktop, click on the patient icon to navigate to the Scan Workplace.
    Figure 5. Patient Icon
  9. In the Prescan Looping window, slowly move the Transmit Gain (TG) slide to 100.
    Note: For all the Transmit Gain (TG) adjustment steps given in this procedure, after the TG slider is set and released in the Prescan Looping window, make sure that the setting is retained by the system (for example the slider does not move back to some other TG setting) prior to executing the next step in the procedure. If the setting was not retained, move the TG slider to the desired setting again and make sure of the setting.
    Figure 6. Prescan Looping Window
  10. Check the CCU temperature.
    • If temperature is below 29°C, leave the manual prescan as-is until the CCU temperature becomes 29°C or more.
    • If temperature is above 29°C, continue on to the next step.
  11. In the Prescan Looping window, slowly increase the TG to 180.
  12. Make sure the wattmeter reading is more than 1 kW and less than 9.5 kW.
    • If the reading is zero or very low:
      1. Make sure the correct center frequency value.
      2. Click Done to stop looping and recheck the test setup cabling.
    • If the reading exceeds 9.5 kW, slowly adjust the CH1/HD gain adjust on the front panel of the RF amp to 9.5 kW watts for body channel 1.
      Figure 7. Gain Adjust
    • If the amplifier trips, reset TG to the highest setting it reached before tripping.
    Note: If the manual prescan must be stopped and restarted, you must relaunch the calibration sequence using the UPM/RAP tool. Click Failure in the calibration dialog box and then click Start on the UPM/RAP tool with the same menu selections to relaunch the calibration sequence.
  13. Slowly increase the TG to 200.
    Note: Allow 10 seconds for the meter reading to stabilize before making the next adjustment.
  14. Check the wattmeter to see if the reading is 15 kW ± 500 watts.
    • If yes, continue on to the next step.
    • If no, slowly adjust the CH1/HD gain on the front panel of the RF amp until the wattmeter reads 15 kW ± 500 watts.
    Note: If RF amplifier trips before Bird wattmeter reading reaches 14.5 kW, do the Alternate calibration procedure for 3T Dual Drive RF Amplifier with Bird wattmeter.
  15. After the RF output is calibrated to specification, reduce the TG to 0 (zero) and click Done.
  16. From the Scan Desktop, click on the CSD icon.
    Figure 8. CSD icon
  17. If the RF output is within specification, click Success in the RF Amp Calibration dialog box.
    Note: The calibration dialog box may be hidden behind the ICW window. Move the ICW window to the left or right to see the RF Amp Calibration dialog box.
  18. Click Yes to make sure that the RF output calibration was successful.

    Result

    After a few seconds, PASS shows in the status area of the RF Amp & Power Monitor tool.