• Discovery MR750w and SIGNA™ Architect T 3.0T System Service Methods
  • 5690002-2EN Revision 4
  • Object ID: 00000018WIA30B42110GYZ
  • Topic ID: id_2003506 Version: 8.7
  • Date: Nov 8, 2021 2:10:04 PM

Running LVShim - Gradshim for systems running DV26.0 or earlier

The objective is to complete fine tuning of the homogeneity of the magnet.

About this task

By default, gradshim is performed in auto mode, although manual mode is also available.

Procedure

  1. Make sure that all coils have been removed from the cradle and phantoms from the bore.
  2. Place the LVShim phantom on the patient table.
    Figure 1. Placing the LVShim phantom on the patient table
    Note: This image is a representative example. Actual systems may vary.
  3. Set up and align the LVShim phantom. Align the phantom so that:
    1. The phantom’s seam is oriented perpendicular to the table.
    2. The phantom’s z-axis is along the length of the cradle.
    3. The phantom is centered left to right with respect to the cradle top.
  4. Landmark on the LVShim phantom crosshairs.
  5. Press Advance to Scan.
  6. Select the gradshim mode:
    OptionDescription
    Auto modeRunning LVShim in Auto mode
    Manual modeRunning LVShim in Manual mode