Gradient Coil Replacement Coil Installation

Prerequisites

After having the fork lift truck remove the failed coil and cradle from the cart, the replacement body coil, on its cradle, must be loaded and taken to the scan room.

1 For Mobiles

The most difficult part of this procedure is getting the replacement coil correctly aligned so that it rolls easily and completely into the bore. A small carpenter's level is a useful tool to have at this point.

Procedure

  1. Figure 1 shows replacement coil and cradle loaded lengthwise on forks, with leading edge resting on wood stack.

    Figure 1. ALIGN REPLACEMENT COIL & CRADLE WITH BORE

  2. Once the replacement coil is in the magnet, go to Step 3- Aligning the Coil in the Bore.

2 REPLACEMENT COIL INSTALLATION

Procedure

    Notice Image
    • caution
    • POSSIBLE PERSONAL INJURY AND/OR EQUIPMENT DAMAGE!
    • NOT HAVING THE CRADLE ANCHORED TO THE CART COULD CAUSE THE CRADLE TO TIP WHEN THE COIL MOVES ONTO IT.
    • THE THREE CRADLE ALIGNMENT/LOCK BOLTS MUST BE IN PLACE BEFORE THE COIL IS ROLLED ONTO THE CART.
  1. Loading Replacement Coil on CartLoading Replacement Coil/Cradle on Cart

    Figure 2. LOADING REPLACEMENT COIL/CRADLE ON CART

  2. Moving Coil into Magnet:
    1. Positioning Replacement Coil at Magnet

      Figure 3. POSITIONING REPLACEMENT COIL AT MAGNET

    2. Installing Replacement Coil

      Figure 4. INSTALLING REPLACEMENT COIL

    3. Mounting the Roller Wheel Assemblies

      Figure 5. MOUNTING THE ROLLER WHEEL ASSEMBLIES

  3. Aligning the Coil in the Bore: Once the replacement coil is in the bore, it must be aligned along the x, y, and z axes.
    1. Aligning the coil along the z-axis. See Figure 6 for the BRM Coil or Figure 7 for the CRM Coil.

      Figure 6. ALIGNING BRM COIL ALONG THE Z-AXIS

      Figure 7. ALIGNING CRM COIL ALONG THE Z-AXIS

    2. Aligning the coil along the x-axis

      Figure 8. ALIGNING THE COIL ALONG THE X-AXIS

    The replacement gradient coil is now completely installed. At this point, you may follow either of two procedures:

    • If the RF Body Coil was removed for later installation in the replacement gradient body coil, perform the procedure to install RF coil below in Install RF Coil,

      OR

    • If the RF Body Coil was replaced along with the gradient coil, go on to the following Connecting Replacement Coil.

3 Install RF Coil

Procedure

  1. Install Tracks in Replacement Gradient Coil

    Figure 9. INSTALL TRACKS IN REPLACEMENT GRADIENT COIL

  2. Install RF Coil in Gradient Coil

    Figure 10. INSTALL RF COIL IN GRADIENT COIL

  3. Securing RF Coil in Gradient Coil

    Figure 11. SECURING RF COIL IN GRADIENT COIL

  4. Centering RF Coil in Gradient Coil

    Figure 12. CENTERING RF COIL IN GRADIENT COIL

4 Connecting Replacement Coil

Procedure

  1. Reconnect Cooling Hoses, Acoustic Collar, and Power

    Figure 13. RECONNECT COOLING HOSES, ACOUSTIC COLLAR, AND POWER

  2. Reinstall Rear Pedestal (in Mobiles only)

    Figure 14. REINSTALL REAR PEDESTAL (IN MOBILES ONLY)