SIGNA MR355 / SIGNA MR360
Service Manual
5856356-3EN Revision 5.0
Basic Service Documentation. Copyright General Electric Company.
Object ID: 00000018WIA30EB5E20GYZ
Topic ID: id_13105778 Version: 3.0
Date: Aug 29, 2019 1:33:52 AM

DQA II Tool

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
Green solution (no loader)	1	1.5T with old style head coil	2131027-2	-
Green solution with loader	1	1.5T with new style head coil	2322997-2	-
Clear solution (no loader)	1	3.0T long bore magnet (E2)	2258365	-
Green solution with loader	1	3.0T short bore magnet	2322997-2	-
For 3.0T systems with a G3 magnet, the DQA phantom with pink solution is no longer used. Use the DQA phantom with green solution, P/N 2322997-2.	-	-	-	-


Required conditions
This procedure requires an accurate landmark. Make sure the laser light alignment is complete. Troubleshoot any problems you find while doing this calibration.

About this task

The DQA tool determines proper gradient polarity (positive to positive, and negative to negative) and proper gradient wiring (X amplifier drives X coil, Y amplifier drives Y coil, Z amplifier drives Z coil) by scanning a series of axial and coronal images of the DQA III phantom. The tool also verifies that the proper phantom is being used. After proper gradient orientation is confirmed, the tool adjusts for Z-isocenter and Gradcal. If Z-isocenter adjustments or Gradcal adjustments are required, the DQA tool needs to restart, so DQA completion time may vary.

Procedure

Insert the appropriate DQA III phantom into the head coil as described below, and verify that it is level and oriented correctly.
Landmark on the center line of the DQA III phantom. The laser must be in the middle of the black circumferential maker line. The correct phantom type, position and landmark are all critical to successful operation of the DQA II tool.
(For 1.5T with new style head coil, and 3.0T short bore magnet) Use the phantom with green solution and loader, P/N 2322997-2.

Figure 1. Phantom Orientation – Split Top Head Coil

Use the correct phantom as described below:
- (For 1.5T with old style head coil) Use the phantom with green solution and no loader, P/N 2131027-2.
- (For 3.0T long bore magnet, E2) Use the phantom with clear solution and no loader, P/N 2258365.
Figure 2. Old Phantom Orientation – Bird Cage Head Coil
Start the DQA tool.
1. Proprietary Service Tools: Make sure the Service Key is installed. On the Common Service Desktop, from the Calibration menu, select Calibration Wizard > Click here to start this tool. After the Calibration Wizard starts, select DQA from the menu, review and okay the pre- and post-dependencies, and select Click here to start this tool to start the procedure.
2. Non-proprietary Service Tools: On the Common Service Desktop, from the Calibration menu, select Calibration > DQA > Click here to start this tool to start the procedure.
When a new window displays, select Start to begin the DQA calibration.

Note:
To stop the DQA tool, select Abort at any point.

Figure 3. DQA at Startup
All phantom images acquired during use of the DQA tool can be viewed in the browser. As the DQA tool progresses, the status displays in the Progress area. If problems are encountered, they display in the Action Required section. To resolve these issues, see DQA Troubleshooting.

Figure 4. DQA Screen with Actions Required
After the issues are addressed (indicated in Action Required), select Restart to start the DQA tool a second time from the beginning.

The tool indicates when it has completed successfully.

Figure 5. Successful Test
Click Exit to exit the DQA tool.

Finalization

No finalization steps.