• Object ID: 00000018WIA3087A970GYZ
  • Topic ID: id_40023791 Version: 1.6
  • Date: Mar 30, 2022 2:25:41 PM

MRA workflow

About this task

Use these steps to create projection images from a 2D stack or 3D volume of MRA images and then view the data from different angles.
Note: The time stamp on MRA images corresponds to the time of the landmark, not the time the source images were acquired.

Step-by-step instructions

  1. From the Patient List, select an appropriate MRA exam.
    • Isometric voxels (cube shaped) and overlapping slices improve the quality of MRA projection images.
    • All images must have the same orthogonal scan plane, image center, and pixel size.
    • There cannot be two images at the same location.
  2. Open MR General Review (Volume Viewer).
  3. Select a protocol.
    1. For an MR General Review:
      • Click the Axial image type in image and select 3D.
      • Alternatively, click on the + icon to view more protocols and select a 3DMIP protocol
    2. For 3D Viewer and READY View:
      • click on the + icon and click Protocol page.
      • From the Protocol page, click a 3D MIP protocol.
    3. For Reformat:
      • Click the oblique image in the upper left view port and select 3D.
      • Click the Oblique data.
  4. On the 3D image, middle-click and drag to adjust the window and level.
    • To view the reference image, right-click the 3D image and select Display Properties > Reference Image.
  5. Define a MIP cut.
    1. From the Segmentation toolbar, click the Scalpel icon ().
    2. Move the cursor to the start location of your cut.
    3. Click and drag around the anatomy of interest.
  6. Optional: Edit a trace.
    1. Place the cursor over the trace edge and drag it to a new location.
    2. Repeat for each edit.
    3. To completely erase your trace and start over, click Clear on the Scalpel screen.
  7. Create the cut.
    Click Cut Outside on the Scalpel tab.
    Figure 1. Image with and without cut applied
    Table 1. Image legend
    NumberDescription
    1MIP image with no cut applied.
    2MIP image with one artery cut.
  8. Optional: Reverse the cut.
    For some applications, such as carotids, it is useful to first cut the left from the right carotid when viewing the coronal collapsed image before proceeding to cutting from other planes.
    1. After the first cut has been made, place the cursor in the 3D View and select Save Volume from the right-click menu.
      Figure 2. Save Volume
    2. To place the cut volume in the Save Recall screen, click the Export tab and click the Save/Recall icon ().
      • A maximum of eight images can be saved to the Save Recall screen.
        Figure 3. Cut volume in Save Recall screen
    3. To restore the volume for the next cut, in the 3D View, right-click and select Restore Volume.
    4. Repeat step b. The Save Recall screen now has both the left and right carotid volumes.
      Figure 4. Save Recall screen with two volumes
    5. To recall a volume, click, drag and drop a volume from the Save Recall screen to any viewport.
    6. To deleted a volume from the Save Recall screen, click the Trash Can icon () in the selected Save Recall view. Respond to any prompts.
    7. To close the Save Recall screen, click the X in the upper right corner.
  9. Select a new plane.
    1. From the Visualization toolbar, click a different anatomical orientation icon.
    2. Repeat steps 3-6 to cut undesired anatomy from as many planes as desired.
    3. You must re-select the Scissors icon to re-open the Scalpel screen.
    4. Consider saving your last cut to the clipboard prior to batch filming.
  10. Save an individual image.
  11. Save rotation Batch Film images. For details, see Create a batch series.
  12. Optional: Apply graphic options.
  13. Optional: Invert the video display.
    1. Click the Visualization toolbar.
    2. Click the Color icon ().
    3. Click Color Map arrow pull-down to open the selection bar.
    4. Click Inverse Gray to invert the video display.
  14. To exit the MRA or MR General Review application session, see Volume Viewer workflow.
    • Once MRA is exited, the MIP images are gone unless they were saved from the Batch screen.
    • Click OK to the prompt and check the Auto save state selection box, if desired.
    • If Auto save is selected, the data’s VOIs are retained and data selected is displayed with the last VOI before exiting the Volume Viewer. To view the data set without the VOI, click on the original data set from the browser.
      Figure 5. Patient list