• SIGNA™ Hero 3.0T Service Methods
  • 5852800-8EN Revision 1.0
  • Object ID: 00000018WIA306EEE20GYZ
  • Topic ID: id_13106433 Version: 3.3
  • Date: Sep 2, 2021 11:21:49 AM

Body Coil Isolation

Prerequisites

Table 1. Personnel requirements
Required personsPreliminary requirementsProcedureFinalization
10 minutes30 minutes0 minutes
Table 2. Tools and test equipment
ItemQuantityEffectivityPart numberManufacturer
Non Magnetic Tool including Allen Wrench to adjust body coil RL position1---
Step Gauge (Placed at rear mounting bracket)1-

5492609

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Table 3. Safety
Table 4. Required conditions
ConditionReferenceEffectivity

LOTO FOR ISC is performed

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Front End Bell is removed.

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Rear End Bell is removed.

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About this task

In this procedure, Body Coil position will be centered to the inner Gradient Coil.

Measurement will be performed at 4 locations for both Front and Rear.

Since there are former supports at 0 degree, 90 degree, and 270 degree positions and it prevents the correct measurement, the gauge will be placed next to the screws near former support (Position A, C, and D in illustration below). At 180 degree (Position B), there is no former support and measurement will be done at 180 degree position.

Figure 1. Measurement position
Table 5. About Position ID
ID Position
ATop Measurement Position
BBottom Measurement Position
CLeft Measurement Position
DRight Measurement Position
Note:

New type of Body Coil support is introduced in Q3, 2016. Two types of body coil support are shown in this procedure.

Topic ID: id_SL3965781-1178720

Body Coil AP Alignment

Procedure

  1. If not done, disconnect the two (2) cooling air ducts at the rear end of the body coil.
    Figure 2. Cooling air ducts
  2. Find Step Gauge which is placed at rear mounting bracket and remove it.
    Figure 3. Step Gauge Location (Rear Magnet)
  3. Confirm that screws and nuts shown in the following illustration are tightened for Front side and Rear side.
    Figure 4. Confirmation
  4. At front end, check the gaps between Body Coil and Inner Gradient Coil at 2 vertical measurement locations (A and B) using Step Gauge.

    Spec: Differential of Gap (A) and Gap (B) ≤ 0.5mm (Identical or no more than 1 Adjacent Step).

    Options of 1 Adjacent Step: a) 9.5 & 10; b) 10 & 10.5; c) 10.5 & 11; d) 11 & 11.5, e) 11.5 & 12

    Figure 5. Step Gauge
    Table 6. Gap Option Matrix
    If gap at A = Then gap at B must =
    9.59.5 or 10
    109.5 or 10 or 10.5
    10.510 or 10.5 or 11
    1110.5 or 11 or 11.5
    11.511 or 11.5 or 12
    1211.5 or 12
    Note:

    There are several notes when measuring the gap.

    1. Since there is a former support at 0 degree position, place the gauge next to the screw shown in illustration below (Position A).

    2. Push fully to the inner bore side so that the gauge stops at inner gradient coil.

      Check that the gauge is not stopped at the level difference between bore light panel and hard body coil.

    3. Read the gauge at the edge of body coil.

    4. Insert side A first (Figure 5). If the gauge stops at 10.5 position, insert side B. If the gauge stops before 11 position line, the gap is 10.5.

    Figure 6. GAP Check
  5. If the gaps does not satisfy the specification in step 4, adjust AP position using RF Body Coil support to meet the specification.
    1. Loosen two M10 Hex Nuts.
    2. Loosen two M10 Hex Socket screws.
    3. Adjust AP position by two M10 Hex Socket screw using Allen wrench.
      Note:

      1 CW turn → 1.5mm up

    4. Fix two M10 Hex Socket screws.
    5. Fix two M10 Hex Nuts for lock of M10 Hex Socket screws.
    Figure 7. Adjustment of RF Body Coil support (AP position)
  6. Repeat Step 4 and Step 5 at Rear end.
Topic ID: id_SL3965776-1178720

Body Coil RL Alignment

Procedure

  1. Confirm that screws and nuts shown in the following illustration are tightened for Front side and Rear side.
    Figure 8. Confirmation
  2. At front end, check the gaps between Body Coil and Inner Gradient Coil at 2 horizontal measurement locations using Step Gauge. Slide the Step Gauge between the hard body coil outside diameter and the hard gradient coil inside diameter until it will not slide any further. The value on the last step to slide between the body coil and the gradient coil indicates the gap. The step gauge is marked in ‘mm’.

    Spec: Differential of Gap (C) and (D) ≤ 0.5mm (Identical or no more than 1 Adjacent Step).

    Options of 1 Adjacent Step: a) 9 & 9.5; b) 9.5 & 10; c) 10 & 10.5; d) 10.5 & 11, e) 11 & 11.5

    Figure 9. Step Gauge
    Table 7. Gap Option Matrix
    If gap at C = Then gap at D must =
    9.59.5 or 10
    109.5 or 10 or 10.5
    10.510 or 10.5 or 11
    1110.5 or 11 or 11.5
    11.511 or 11.5 or 12
    1211.5 or 12
    Note:

    There are several notes when measuring the gap.

    1. Since there is a former support at 90 degree and 270 degree position, place the gauge next to the screw shown in illustration below (Position C and D).

    2. Push fully to the inner bore side so that the gauge stops at inner gradient coil.

      Check that the gauge is not stopped at the level difference between bore light panel and hard body coil.

    3. Read the gauge at the edge of body coil.

    4. Insert side A first (Figure 9). If the gauge stops at 10.5 position, insert side B. If the gauge stops before 11 position line, the gap is 10.5.

    Figure 10. GAP Check 2
  3. If the gaps does not satisfy the specification in step 1, adjust RL position using RF Body Coil support to meet the specification.
    1. Loosen screws.
    2. Adjust RL position using allen wrench.
      Note:

      • When centering at Front side, access from right hand side, and access from left hand side at Rear. See illustration below.

      • 1 CW turn → 1.5mm push

    3. Fix screws.
    Figure 11. Adjustment of RF Body Coil support (RL position)
  4. Repeat Step1 and Step2 at Rear end.
Topic ID: id_SL3965791-1178720

Final Check

Procedure

  1. After re-tightening any loosened nuts, check RL position and AP position of Front End and Rear End again per Body Coil AP Alignment and Body Coil RL Alignment and adjust the position if necessary until the specifications are satisfied.
  2. Restore Step Gauge at rear mounting bracket.
  3. If you are doing RF Body Coil Replacement Procedure, return to the original procedure. Changing RF Body coil isolation/alignment will affect coil tuning
Topic ID: id_14938420

Finalization

Finalization

No finalization steps.