• Object ID: 00000018WIA30EFF870GYZ
  • Topic ID: id_40024145 Version: 1.6
  • Date: May 26, 2022 9:51:59 AM

PROBE 2D CSI: acquire a scan

Before you begin

A localizer and 2D CSI series are in the Workflow Manager. Select the 2D CSI series and click Setup.

About this task

In order to display the localizer image in READY View, the center of each reference slice must be within 0.8 mm of each CSI slice. If a slice that meets this criterion does not exist in the selected reference series, READY View displays an error message, "Localizer loading failed, no matching image". Click OK to the error message. READY View launches, but an image does not display in the lower-left viewport. To avoid this problem, follow these guidelines when prescribing a 2D CSI scan.

Important: Do not save the 2D CSI protocol as an oblique plane. Save the protocol as an axial plane and then change the plane to oblique when you are viewing/editing the series.

Step-by-step instructions

  1. Place the sagittal and coronal images (if you are depositing the VOI on an axial) in two of the localizer viewports.
    • Use the middle mouse button to select the desired viewport.
    • Using the left mouse button to select these viewports deposits the VOI and you are not ready to do that until step 2.
  2. Place the image on which you want to deposit the VOI in the third viewport.
  3. Click the image on which you want to deposit the VOI.
  4. To change the VOI shape, click Grid from the Graphic Rx Spectro menu and only change the VOI shape on the image that displays the CSI Grid.
    Figure 1. Example of: Axial image displaying CSI grid
  5. To define the voxel thickness, change the value in the text box.
    • Do not click and drag the VOI to change the voxel thickness.
    • Do not use the Start and End Graphic Rx buttons to define the VOI for a 2D CSI scan.
  6. From the Graphic Rx toolbar, click SAT and deposit the SAT pulses.
  7. From the Graphic Rx Tools menu, click Loc Ref Lines.
  8. Verify that the VOI is bisected by the yellow reference line in the two planes that are orthogonal to the plane in which you deposited the VOI.
    • In the following example, the VOI was deposited on the axial image. In image A the VOI size was only adjusted on the axial image. The VOI is bisected by the yellow lines in both the sagittal and coronal images. In image B, the VOI size was changed by clicking and dragging the VOI in the coronal plane. When the reference lines are displayed, it is clear that the VOI is not bisected by the yellow lines in the coronal and sagittal planes. The results are the following:
      • Image A will display the localizer when READY View is launched.
        Figure 2. Image A. Note that the VOI is bisected by the yellow cross reference lines
      • Image B will NOT display the localizer when READY View is launched.
        Figure 3. Image B. Note that the VOI is off center from the yellow cross reference lines. This prescription will NOT launch the localizer in READY View
  9. Click Scan > Auto Prescan to start the APS processes.
    • The APS processes optimize the transmit (TG) and receiver gains (R1 and R2), the center frequency, the shim (the Autoshim process), and, specific to the spectroscopy pulse sequences, the power of the water suppression pulses.
  10. Optional: Click Scan > Spectro Prescan to acquire and display the spectroscopy data. This step is typically only performed by research sites.
  11. Click Scan.