Expert Settings
The Expert tab, presents the advanced settings of the 3D ROI Operator. For the typical user, these settings will not need to be changed.
Data Group
By default, VQ ROIs are written in a compressed format. To extend compatibility with other tools (e.g., ITK), uncheck “compressed.” If the ROI files will only be used within VQ, leave the “compressed” box checked.
Importing and Exporting ROIs
To import an ROI loaded in the Data Manager from an image file, click the Import button 
and select the corresponding dataset to import. To export a 3D ROI as an image to allow manipulations outside of the 3D ROI operator, click the Export button 
.
Rendering
If “auto” is checked, ROIs will be re-rendered in the MIP view automatically upon certain triggers. When unchecked, rendering will only occur when the VTK button is used. For systems with less speed and memory, it may be helpful to select a less demanding setting from the rendering quality combo box.
Segmentation
To add a curvature flow smoothing preprocessing step to the segmentation methods, check the “Smoothing” box. Use the Segmentation fields to tune up the parameters of the segmentation methods. The Smoothing filter will use the Iterations and Time Step settings; the Confidence Connected Thresholding will use the Multiplier and NeighborRad (neighborhood radius) settings; the Neighborhoood Thresholding will use the NeighborRad setting.
Crop Range
To perform any of the thresholding segmentation methods on only a sub-region of the input image, follow these steps:
-
Open the Cropping operator from the Operators drop-down menu.
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Use the red sliders to select the desired region of the image.
- After you’ve selected the desired region, go back to the 3D ROI operator by selecting the 3D ROI operator from the Operators drop-down menu.
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In the Expert tab of the 3D ROI Operator, mark the Crop Range checkbox. Dashed red lines will appear on the image, indicating the boundaries of the selected region.
- When the desired thresholding method is performed (see Segmentation Tools to learn how to use the Segmentation panel of the 3D ROI Operator), only the region within the crop range will be segmented.
