• Discovery MR750w and SIGNA™ Architect T 3.0T System Service Methods
  • 5690002-2EN Revision 4
  • Object ID: 00000018WIA3000CE20GYZ
  • Topic ID: id_13106528 Version: 3.0
  • Date: Aug 29, 2019 1:48:47 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 front mounting bracket)1-

5397937

-
Table 3. Safety
Table 4. Required conditions
ConditionReferenceEffectivity
LOTO FOR XRFD Amp and PEN Cabinet is applied--
Split Bridge and Front / Rear End Bell are removed.--
Topic ID: id_SL3965776-1126140

Body coil RL alignment

Procedure

  1. Find Step Gauge which is placed at front mounting bracket and remove it.
    Figure 1. Step Gauge Location
  2. Note: Body Coil shape may not be perfect circle and it might be slightly ellipse. So, there are two specs for RL alignment and AP alignment.
    At front end, check the gaps between Body Coil and Inner Gradient Coil at 2 horizontal measurement locations (90deg/3 o’clock and 270deg/9 o’clock) 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 (90deg/3 o’clock) and (270deg/9 o’clock) ≤ 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 2. Step Gauge
    Table 5. Gap option matrix
    If gap at 90deg/3 o’clock = Then gap at 270deg/9 o’clock must =
    99 or 9.5
    9.59 or 9.5 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
    Figure 3. GAP check 1
  3. If the gaps does not satisfy the specification in step 2, adjust RL position using RF Body Coil support to meet the specification of step 2.
    Figure 4. Adjustment of RF body coil support (RL position)
  4. 4. Repeat Step2 and Step3 for Rear end.
Topic ID: id_SL3965781-1126140

Body coil AP alignment

Procedure

  1. At front end, check the gaps between Body Coil and Inner Gradient Coil at 3 vertical measurement locations (0 deg/12 o’clock, 120 deg/4 o’clock, and 240 deg/8 o’clock) using Step Gauge.
    Spec:
    • Differential of Gap (0deg), Gap (120 deg), and Gap (240 deg) ≤ 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

    • Also ensure Gap (0deg/12 o’clock) ≤ Gap (120 deg/4 o’clock) and Gap (0deg) ≤ Gap (240 deg/8 o’clock)
    Figure 5. Step Gauge
    Table 6. Gap Option Matrix
    If gap at 0 deg/12 o’clock = Then gap at 120 deg/4 o’clock must = Then gap at 240deg/8 o’clock must =
    99 or 9.59 or 9.5
    9.59.5 or 109.5 or 10
    1010 or 10.510 or 10.5
    10.510.5 or 1110.5 or 11
    1111 or 11.511 or 11.5
    11.511.511.5
    Figure 6. GAP check 2
  2. If the gaps does not satisfy the specification in step 1, adjust AP position using RF Body Coil support to meet the specification of step 1.
    Figure 7. Adjustment of RF body coil support (AP position)
  3. Repeat Step1 and Step2 for Rear end.
Topic ID: id_SL3965791-1126140

Final check

Procedure

  1. 1. After re-tightening any loosened nuts, check RL position and AP position of Front End and Rear End again per Body coil RL alignment and Body coil AP alignment and adjust the position if necessary until the specifications are satisfied.
  2. Restore Step Gauge at front mounting bracket.
  3. If you are doing RF Coil Replacement Procedure, return to the original procedure. Changing RF coil isolation/alignment will affect coil tuning
Topic ID: id_14938530

Finalization

Finalization

No finalization steps.