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Adjustments/Calibrations
Gradient
Calibrating grafidy
Grafidy adjusts and compensates short, long, and very long time constant eddy currents for both linear and B0 terms. Use the Grafidy procedure to do eddy current compensation.
Finalizing Grafidy calibration

Adjustments/Calibrations
- System
- Gradient
  - Calibrating High Order Eddy Current (HOEC)
    Use HOEC to characterize the time-dependent magnetic field errors in the bore up to at least the third order.
  - Calibrating grafidy
    Grafidy adjusts and compensates short, long, and very long time constant eddy currents for both linear and B0 terms. Use the Grafidy procedure to do eddy current compensation.
    - Setting up grafidy hardware
    - Running Grafidy
      Running Grafidy in auto mode includes all axes.
    - Finalizing Grafidy calibration
- Radio Frequency (RF)
- Magnet Enclosure
- Patient Table
- Global Operator Console (GOC)
- Spectroscopy

Discovery MR750w and SIGNA™ Architect T 3.0T System Service Methods
5690002-2EN Revision 4
Object ID: 00000018WHA30910CGYZ
Topic ID: id_2002361 Version: 9.2
Date: Oct 28, 2021 11:28:09 AM

Finalizing Grafidy calibration

Procedure

Exit the software tool, saving the eddy current data.
Remove the Grafidy fixture from the system.
If calibration is being run within ICW installation mode continue to the next calibration procedure. Otherwise, Save Grafidy eddy current data to SaveInfo media. See Running the Save and Restore tool.