SIGNA MR355 / SIGNA MR360
Service Manual
5856356-3EN Revision 5.0
Basic Service Documentation. Copyright General Electric Company.
Object ID: 00000018WIA306C5E20GYZ
Topic ID: id_13106286 Version: 3.0
Date: Aug 29, 2019 1:33:55 AM

DQA Tool II

Prerequisites

Table 1. Personnel requirements
Required persons	Preliminary requirements	Procedure	Finalization
1	Not Applicable	30 minutes	Not Applicable

Table 2. Tools and test equipment
Item	Quantity	Effectivity	Part number	Manufacturer
DQA-III Phantom	1	-	2321556	-

Table 3. Required conditions
Condition	Reference	Effectivity
Laser Light Alignment completed.	-	-
Rough Supercon Shim	-	-

About this task

The DQA II tool will determine proper gradient polarity (positive to positive and negative to negative) and proper gradient wiring (X amp drives X coil, Y amp drives Y coil, Z amp drives Z coil) by scanning a series of Axial and Coronal images of the DQA III Phantom.

The tool will also verify that the proper phantom is being used. After proper Gradient orientation is confirmed, the tool will adjust for Z-ISO-Center and gradient calibration. If Z-ISO adjustments or gradient calibration adjustments are needed, the DQA-II tool will perform the appropriate iterations to complete. Therefore, the DQA II tool's completion time varies.

Notice

Verify That The Laser Alignment Has Been Complete. Pay Close Attention To Position The Alignment Light On The Phantom, As This Procedure Requires An Accurate Landmark.

Notice

If you encounter problems performing this calibration, see the DQA Troubleshooting.

Procedure

Insert the appropriate DQA-III Phantom into head coil, and verify its orientation and that it is level. See Figure 1.

Note:
The correct phantom type, position and landmark are all critical to successful operation of the DQA-II tool.

It is very important that you securely clamp the head coil to the table, otherwise there is a chance the coil can move out of position during table advance to isocenter.

You should also ensure that landmarking is positioned precisely on the black circumferential line around the phantom's waist.
Landmark on the centerline of the DQA-III Phantom. Laser must be in middle of black circumferential maker line.

Figure 1. Phantom Orientation, split top head coil
Start the DQA Tool.
- Starting non-proprietary service tools: From the Common Service Desktop, select Calibration, DQA from the calibration menu, and select Click here to start this tool to start the procedure.
A new window will appear (see Figure 2). Select Start to begin the DQA calibration.

Figure 2. DQA at Startup

Note:
All phantom images acquired during the DQA II tool can be viewed in the browser. You can view these images if problems occur.

To stop the DQA Tool without restarting it click Abort at any point.
As the DQA tool progresses, the status appears in the Progress area. If problems are encountered, they will appear in the Action Required section (see Figure 3).

Figure 3. DQA Screen with Actions Required

Note:
Once you have addressed the issues indicated in the Action Required, click Restart. This will start the DQA Tool again from the beginning.
The tool will indicate when it has completed successfully (see Figure 4).

Figure 4. Successful Test

Note:
To restart the DQA Tool at any point during the process click Restart. To stop the DQA Tool without restarting it click Abort.
After all scan completed, dialog box appears and ask " do you update new config …Yes or no" . Click [Yes] to update.

Finalization

Click Exit to exit the tool.