• Discovery MR750 3.0T System Service Methods
  • 5690009-2EN Revision 4
  • Object ID: 00000018WIA30F92040GYZ
  • Topic ID: id_2013015 Version: 2.8
  • Date: Apr 23, 2020 8:36:14 PM

Quick view of auto coil prescription

Service manual mode receive element group selection

For troubleshooting, it may sometimes be useful to acquire data using exactly the same elements used during a customer scan. The coil selection User Interface (UI) manual mode, along with the information in the DICOM header, can be used to do this as described in this document.

Coil selection manual mode allows REGs to be selected manually under GESERVICE mode:
  1. View the image DICOM header using Browser > Tools > Image Header.
  2. Locate the Receive Element Groups (REG)s used for the local coil mode in each series in DICOM tag (0043, 10C2).
  3. Select Manual Mode from the gear icon on the coil selection UI.
  4. Select the REGs indicated in the DICOM header from the list on the coil selection UI.
  5. After scanning the localizer, the extent of the dynamic coil mode generated for the currently selected REGs can be seen on the graphic Rx viewports.
Figure 1. Auto coil prescription receive element group manual mode
1The manual tools icon is only available in GESERVICE and RESEARCH modes.

REGs in bold are those that the ACRx algorithm would select.

Notice: REGs will not be automatically selected if the user interface is left in manual mode. Select the desired REGs or select auto mode prior to scanning.

Tips

The coil calibration scan will be reused from a previous series if possible. If the scan is reused from another series, Coil/s# will be shown on the series text page.

Figure 2. Coil calibration scan acquired as part of the current series
Figure 3. Coil calibration scan reused from series 3

Enabling coil extents

To show Ax/Sag/Cor coil coverage (coil extents), check Show Coil Extents from the GRx pull-down menu.

Figure 4. GRx pull-down menu

Extent lines will not appear until after the prescan completes for the currently selected coils and table location. Gray extent lines show the extent of the entire coil and blue lines show the extents of the selected elements.

Figure 5. Without extents
Figure 6. With extents
1AA coil coverage
2PA coil coverage

Putting it all together

Figure 7. Axial slices on sagittal localizer

ACRx automatically selected the optimal REGs.