• Topic ID: id_2001634
  • Version: 10.0
  • Date: Feb 14, 2020 4:00:47 PM

Calibrating for quadrature

Prerequisites

Personnel requirements
Required persons Preliminary requirements Procedure Finalization
1 - 45 minutes -
Tools and Test Equipment
Item Quantity Part Number Manufacturer
LV Shim Phantom Inner Sphere 1 2274476 -
Universal Phantom Pad 1 46-328383P1 -
Required conditions
If the site has more than one table or if the system has more than one PA coil, you must do a separate calibration for each different combination of table and PA coil.
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.

Procedure

  1. Go to Calibrations in the Common Service Desktop and start the Quadrature Calibration.
    note: For more information see, Quadrature Calibration Help.
  2. Set up the 31 cm blue sphere phantom in the head position on the universal phantom pad.
    1. Set the universe phantom pad at the 315 mm position (from home) on the table and align the white lines on the pad with the alignment lights.
    2. Put the sphere on the pad with the strap (in the groove) in the orientation shown below.

      Figure 1. Sphere phantom position

  3. Landmark at the 315 mm position and then advance the phantom to scan.
  4. On the calibration tool, click Calibrate.

    The tool does a set-up check before scanning begins to make sure the sphere is in the correct position. The text in the Quadrature Calibration Tool window tells you to adjust the sphere, if necessary. After the tool verifies the correct position of the sphere, the system starts the calibration scans. The tool window shows the status of the scans. When the head scans pass, the Place Phantom dialog box shows.

    note: You must move the phantom to the next calibration location before you click OK in this dialog box.
  5. Set up the phantom for the body scan as follows:
    1. Move pad and sphere to the 1080 mm position (from home) or I765 from the head position.
    2. Put the sphere back on the pad with the strap (in the groove) in the orientation shown in Figure 1.
  6. Do a landmark at this position and then advance to scan.
  7. Click OK on the Place Phantom dialog box.

    The system does all transmit and receive scans for the center location.

    Figure 2. Center tests in progress

  8. Calibrate all other table calibration combinations.
    When all the scans pass, the system is ready to use.