• Discovery MR750w and SIGNA™ Architect T 3.0T System Service Methods
  • 5690002-2EN Revision 4
  • Object ID: 00000018WHA305C3EGYZ
  • Topic ID: id_2002769 Version: 4.0
  • Date: Nov 3, 2021 4:05:16 PM

Running LVShim

The objective of the LVShim tool is to fine-tune magnet homogeneity.

Prerequisites

Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
1-30 minutes10 minutes
Tools and test equipment
ItemQuantityPart numberManufacturer
LVShim Phantom Inner Sphere12274476-
LV Phantom Small Half Assembly12306642-
LV Phantom Big Half Assembly12306645-
Curved Adapter Panel for Flat Table (GEM)15395828-
Universal Phantom Pad146-328383P1-
Service Filler Panel15344577-
Note: The LV Phantom Small Half Assembly, LV Phantom Big Half Assembly, and LVShim Phantom Inner Sphere are used for systems running software versions DV26.0 or earlier. The LVShim Phantom Inner Sphere alone is used with the Universal Phantom Pad for systems running software versions DV29.1 or later.
Required conditions
Confirm that passive shimming is complete and is within specification.
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.

Note: If the system is running DV29.1 or later, no side lobes are required for shimming. The system will report an error if the side lobes are used. If the system is using DV26.0 or earlier, side lobes are required for shimming.