Function Name Description
White box Represents the Opacity Threshold values. When using Ramp-up shape:
•
Drag the lower white box to the right to remove soft tissue from an exam to modify the maximum
opacity of voxels.
•
Click the upper white box at the top of the ramp and drag up or down to modify the opacity of all
visible voxels.
Blue Box Allows you to shift the whole ramp. Click and drag the solid blue box on the ramp to change the upper
and lower values of the ramp.
Red Box Represents the scale of voxel values. Click and drag the box left or right to shift the display.
•
Zoom in or out with the Zoom icons upper-right corner.
•
Right-click the main control to return to the original zoom.
VR Ramp Represents the voxel opacity in the VR images as a function of the voxel values. It means that voxels
with identical value will have the same opacity.
Color Activates the color. An unchecked box displays the VR in black and white.
Partial Volume Filter Attenuates the partial volume by associating partial volume voxels with adjacent voxels that represent
the more opaque object. It improves the visibility of structures that would otherwise be hidden by parti‐
al volume voxels and improves the color coding of voxels in color mode.
Active Color
Use to select the active color. Click the square color button below the ramp (the triangle above the
color gets black). Click Active Color to change the color.
Transition
•
Smooth: shaded transition from one color to the next.
•
Step: all voxels inside the value range display the same color. When Step is selected small white
diamonds indicating range borders display. Click the diamonds to adjust precisely range of val‐
ues that are assigned to each color.
Brightness
The amount of light displayed in the model. Type in a value greater than 100 to increase the light in
the model.
5.7 Display a VR image
Use these steps to display a Volume Render image and the VR tab on the Tools screen.
1.
Open
Reformat
.
2.
Right-click the View Type active annotation and select
VR
.
Revolution CT User Manual
Direction 5480385-1EN, Revision 1
474 5 Volume Render
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