DQA II Tool Troubleshooting

See Table 2 to determine action if there are failures when using DQA II Tool.

notice The correct phantom type, position and landmark are all critical to successful operation of the DQA II Tool. See the table and illustrations below.

Figure 1. Phantom Positioning for New Style (Split Top) Head Coil

Figure 2. Phantom Positioning for Old Style Head Coil

Figure 3. Directional Gradient Information in Bore

1. Open the browser.

2. Review the last exam.

The DQA II Tool scans axial images (example in Figure 4) in one study, and creates a new exam or study (example in Figure 5) for the coronal images. A similar axial should appear, but it may not be the center image.

Figure 4. Axial Image

Figure 5. Coronal Image

1. Before checking gradient cabling, verify that the gradient polarities in the Gradient Config file are properly set.

   • For magnets ramped positive (red to + and black to -), all values should be positive.

   • For magnets ramped negative or reverse ramped (red to - and black to +), all values should be negative.

2. To view gradient config values:

   1. Open a C-shell and type cd /w/config.

   2. Type more GradientConfig.cfg.

   3. Scroll down and highlight the desired file: xfull, yfull, zfull.

   4. To review the entire contents of the file, type more out.

   note:

   For all TwinSpeed systems, review these files: GradientConfig.cfg.WHOLE and GradientConfig.cfg.ZOOM.

The illustration below is an example of a phantom rotated counterclockwise and grossly offset in the +X position.

Figure 9. Example of Rotated and Offset Axial Image