• SIGNA™ Hero 3.0T Service Methods
  • 5852800-8EN Revision 1.0
  • Object ID: 00000018WHA30BE62GYZ
  • Topic ID: id_2001481 Version: 7.0
  • Date: Nov 2, 2021 1:33:29 PM

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.

Prerequisites

Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1-60 minutes10 minutes
Tools and test equipment
ItemQuantityPart numberManufacturer
LVShim Phantom Inner Sphere12274476-
Universal Phantom Pad146-328383P1-
Required conditions
Confirm that grafidy eddy current calibration is complete.
Remove all coils from the cradle and phantoms from the bore.
Safety

Before working in any GE Healthcare MR suite or performing any GE Healthcare service procedure, you must:

  • Have read and understood all hazard conditions and safety requirements in the latest revision of the GE Healthcare MR Service Safety Manual (5452735).
  • Have successfully completed all relevant GE Healthcare Environmental Health and Safety (EHS) courses (or for non-GE employees, equivalent workplace training courses).
  • Comply with all site-specific training and workplace safety requirements.

If you have any safety concerns at any time, do not begin work or immediately stop work and move to a safe location. Immediately contact your supervisor or site safety officer for instructions on how to proceed.

About this task

Use the High Order Eddy Current (HOEC) procedure to characterize the time dependent magnetic field errors in the bore up to at least the third order. This calibration works in conjunction with Grafidy eddy current calibration, which adjusts and compensates the short, long, and very long time constant eddy currents for both linear and B0 terms. Run the HOEC calibration anytime after Grafidy is run.