• Object ID: 00000018WIA3003F770GYZ
  • Topic ID: id_40025942 Version: 1.3
  • Date: Mar 29, 2022 2:43:54 PM

Active annotation

About this task

Use this information to understand active annotation. The annotation varies based on the application launched (3D, MRA or Reformat), the selected view and the annotation level defined in Preferences.

Step-by-step instructions

  1. One of the following MR General Review applications is open: MR General Review, 3D Viewer, Reformat/MIP or READY View.
  2. To define the annotation level, see Annotations preferences: adjust annotation fields and fonts.
  3. The following procedures describe how to manipulate each of the active annotation fields. It assumes that Full annotation is selected as the preference.
    Figure 1. Volume Viewer active annotation screen
    Table 1. Active annotation procedures
    Active annotationProcedure
    View type
    Left or right-click and select a view type from the menu.
    Figure 2. View Type menu that may vary based on the image in the viewport


    • The type of view displayed in each of the four views of the viewing area is determined by the selected protocol.
    • During image processing, you can change the view at any time using the active annotations. The term "coi" on an oblique view refers to the center of the image.
    Parametric or Functional Annotation
    Figure 3. Top line: Plane annotation followed by series type/parametric map annotation

    Click the parametric map (time course, diffusion, functional, or metabolite) annotation and make a selection from the menu.

    Phase/Rank: typically use this with a time-course or fMRI data set.

    Method 1

    Figure 4. Yellow phase/rank annotation in upper left corner of viewport
    Click the yellow annotation from the top of the viewport and select a rank/phase from the Volume Selector menu.
    • Alternatively, modify the rank annotation, at the middle bottom right area of the viewport.
      Figure 5. Yellow phase/rank annotation in middle bottom right area of the viewport


    Phase/Rank: typically use this with a time-course or fMRI data set.

    Method 2

    Figure 6. White vertical line (1) can be moved to desired phase/rank/time
    Click and drag the vertical white bar on the graph view to the desired rank/phase number.
    • The yellow rank/phase/time annotation updates.
    Scan location and slice number
    Middle-click and drag horizontally to scroll through the images or click to increment and right-click to decrement an image at a time.
    • Alternatively, you can use the left and right arrow keys on the keyboard to move through the image set. Scan location is not available on 3D views.
    Slice thickness
    Middle-click and drag horizontally to real-time change the slice thickness or click to increment and right-click to decrement the slice thickness on reformatted images.
    • Slice Thickness is not a selection on a 3D or MPR 3D view.
    MIP

    Click to change the MIP to another projection type.

    Figure 7. MIP projection types


    DFOV
    Middle-click and drag horizontally to real-time magnify the image or click to increment and right-click to decrement the mag factor.
    • The maximum zoom factor (ratio between acquisition DFOV and actual DFOV) is 8.0.
    • You cannot increase the DFOV beyond the original value, unless the height of the stack of images (number of images × slice thickness) is larger than the DFOV. In that case, you can zoom up to the height of the stack of images (zoom factor < 1.0).
    Window width and level

    Middle-click and drag vertically and horizontally to real-time change the W/L.

    • Alternately, move the mouse over the annotation and type in a new value or right-click to display the W/L Preset menu.

    To modify the window W/L of the reference images, click and hold the middle mouse button on the reference image and move the mouse as above.

    Patient name

    Click or right-click and select Show or Hide to hide or show patient name.

    Image roam

    After zooming in (decreasing the FOV), click and drag to move the image within the viewport.

    Graph annotation

    For details, see Active graph annotation.

    Algorithm mode and cut plane

    This is 3D specific annotation.

    Left or right-click the algorithm mode to select an option.

    Left or right-click No Cut to display the list of cut planes.

    Figure 8. This menu may be slightly different depending on the image type and rendering mode selected in the viewport.


    No VOI

    This is 3D specific annotation.
    Left or right-click No VOI and select Sphere Shutter on Cursor or Curved VOI.