Display; Annotation - GE Revolution CT User Manual

3 Display

In most respects, a 3D display view is like any other view. You can adjust window width and
level as required, zoom, and scroll the image. You can add text annotations and change the
color of the displayed object. In theory, you can also perform measurements or define and
perform a scalpel cut on a 3D view since you can mark points and create traces on it. In
practice, this is highly inadvisable, because on the 3D view you have no indication how deep
into the 3D object the 3D cursor is located, and the result may not be at all what you wanted or
expected.
A 3D view is different in that it displays an image of the 3D model (which may consist of one or
more 3D objects), and that you can manipulate this 3D model.
On a 3D view, you can:
•
Rotate and tilt the 3D model in all directions.
•
Define one or more cut planes and display the 3D model with part of it removed, showing a
cross section of the model at the location of the cut plane.
•
Place a spherical shutter (mask) on the view to show only an essential part of the model,
with the remainder masked out.
• Use colors, in particular to distinguish merged 3D models in merged 3D views.
•
Extract a 3D object or volume of interest from the original 3D models using the Segment
tools.

3.1 Annotation

There are two types of annotation:
• System annotation which is automatically supplied by the system and is always displayed in
the same place. The type and amount of annotation displayed can be modified but not
moved.
• User annotation which is annotation you add. This annotation can be text or measurements
and can be placed anywhere on the viewport.
Text annotation
You can add notes and comments directly on the views, and use a marker with the annotation
to point out anatomical features. User text annotations can be edited, moved or deleted as
necessary. When images are saved, any annotations shown on the images are saved with
them.
Preset annotation
Preset annotations are those which have already been created and saved for future use. These
annotations can consist of text or text with measurement annotations. The preset measurement
annotations vary depending on the current protocol. In addition to the supplied default
annotations supplied, you can create and save annotations.
Measurement annotation
You can create and view various measurements (voxel value, distance, angle, area, volume) on
the views. Like text annotations, they can be moved, deleted or edited as necessary.
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Revolution CT User Manual
Direction 5480385-1EN, Revision 1
3 Display