Adjust/Cals
- System Level Procedures
- Gradient System
  - Echo Planar Test (EPT)
  - Grafidy3 Procedure
  - Calibrating High Order Eddy Current
    Use HOEC to characterize the time-dependent magnetic field errors in the bore up to at least the third order.
    - Setting up for HOEC calibration scan
    - Running HOEC
      - Saving information
        Save the current configurations and files in order to restore them later, if needed.
      - Doing a check scan
        A check scan is done at the conclusion of many procedures. This functional check assures the unit is in good clinical working order.
- RF System
- Magnet System And Enclosure
- LINUX PC-Global Operator Console
- Lite Patient Transport Service Methods
- Low Height Fixed Table
- Power Distribution Unit
- Surface and Head Coils
- Blowers and Chillers

SIGNA MR355 / SIGNA MR360
Service Manual
5856356-3EN Revision 5.0
Basic Service Documentation. Copyright General Electric Company.
Object ID: 00000018WHA30C89BGYZ
Topic ID: id_2002110 Version: 7.4
Date: Jun 23, 2021 10:52:44 PM

Running HOEC

Procedure

Make sure all three axes are selected (screen default).
In the HOEC window, click Scan.

In the status window, the tool displays the message that the analysis is complete for each axis (x, y, and z).

If the tool completed the analysis for all three axes, exit the tool.
If the tool did not complete the analysis, review the error log for possible system issues.

Figure 1. HOEC with results


Interface control	Resulting action
Expert Mode button	Allows you to view the images analyzed by the tool (this is primarily used to look for sources of error). Use Expert Mode only if directed to do so by OLC.
Gradient X/Y/Z boxes	By default, all three of these boxes are checked. When one of these boxes is checked, that gradient is included in the HOEC calibration.
Select Scanned File button	Click this button to select the results file from a previous HOEC calibration.
Re-Analyse button	Click this button to reanalyze the results file from a previous HOEC calibration. You must select a scanned file before clicking this button.
Scan button	Starts the HOEC calibration.
Abort button	Stops the HOEC calibration.
Exit button	Closes the HOEC calibration tool.

Finalization

Remove any phantoms from the bore.
If calibration is being run within ICW installation mode continue to the next calibration procedure. Otherwise, Perform SaveInfo. See Saving information.
Perform Check Scan before turning the system over to the customer. See Doing a check scan.