SIGNA MR355 / SIGNA MR360
Service Manual
5856356-3EN Revision 5.0
Basic Service Documentation. Copyright General Electric Company.
Object ID: 00000018WIA306AAF20GYZ
Topic ID: id_13107171 Version: 1.9
Date: Mar 19, 2020 6:17:59 AM

System Gain Body Calibration

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	10 minutes	20 minutes	10 minutes

Table 3. Safety

Warning

POISON HAZARD!

1.5T, 1.0T, and 0.7T Phantoms CONTAIN NICKEL, A SUSPECTED CARCINOGEN.

DO NOT INGEST. DISPOSE OF AS A HAZARDOUS WASTE ACCORDING TO STATE AND FEDERAL REGULATIONS.

Warning

POISON HAZARD!

3.0T Phantoms Dimethyl Silicon Fluid.

DO NOT INGEST. If a lead or spill occurs, wipe up or absorb in inert material and place in a container for disposal. Incineration or landfill is the recommend disposal method.

Table 4. Required conditions
Condition	Reference	Effectivity
Signa software is fully operational.	-	-
Gradient Calibration is completed.	-	-
No image artifacts are present.	-	-
System is set to the English language.	-	-

System Gain Body

Procedure

For systems with the new Split-Top Head Coil, position the SNR Sphere in the head loader as shown. Fasten the strap to the top of the head load to secure the SNR Sphere in the loader.

Figure 1. Positioning SNR Sphere in Head Loader
Position the Head Loader on top of the Head TLT Loader Holder in the head coil (shown below) so the loader is centered and the loader axial mark is at the center of the head coil window.

Figure 2. Landmarking Head SNR Sphere
For systems with the Quad Head Coil, position the DQA Phantom in the head coil.
1. Turn on the alignment lights, and align so the center of the DQA Phantom matches the axial beam.
2. Place the Head TLT Sphere in the head loader, and fasten the strap to the top of the head loader to secure the sphere.
3. Remove the DQA Phantom and replace with the Head Loader/Sphere centering it using the axial alignment light.
Place the SPT Body Loader and Body Sphere after the head coil as shown.

Figure 3. Phantom Setup
Landmark on the head coil. As the calibration runs, the table will move to the body coil scan by itself.
Go to the CSD and start the Service Browser if not already running. Select the Calibration icon and select System Gain Calibration.

Figure 4. Starting System Gain Calibration
In the System Gain Calibration tool, type 2 and press Enter for Auto Mode.

Figure 5. Starting System Gain Calibration in Auto Mode
In the next window, select option 2 and press Enter for Body Mode calibration.
Figure 6. Selecting Body Mode Calibration

When testing is completed, one of two messages will display:
- One will indicate the calibration is done and no adjustments are required.
- The other message will ask if the new Recon Scale Factor should be saved. Type Y and press Enter to save the new calibration file.
  Figure 7. Calibration Output
When finished, type 4 and press Enter to exit the tool.

Finalization

Procedure

Proceed to System Gain Head Calibration if required.
Reboot the system.
Remove all phantoms from the system, and perform a check scan to ensure system operation.