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The brain VOIs are structurally organized in a tree on the Group tab of the VOI editing page. The selection of a VOI subset is supported by a dedicated user interface illustrated below.
The branches on the top level are the left (L) and right (R) structures, Central structures, Posterior fossa, and the Ventricles as illustrated in the left panel above. The full tree can be opened easily by the button indicated in the middle panel. The tree view can be flattend to a simple list by the button at the top indicated in the right panel. The statistics will only be calculated for the selected VOIs.
Tree Manipulations
Branches in the tree can be opened/closed with the little arrows left to the branch names.
Tree Selections
The structures of interest are the ones with checked boxes to the left of their color code. Simply click into a box for changing the selection. In the example below the FL_mid_fr_G VOI has been de-selected.
If the selection of a branch is removed, all VOIs belonging to it will be de-selected.
The task of selecting parts in the tree is supported by shortcuts in the area at the tree bottom:
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Remove the selection check of all VOIs. |
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Set the selection check of all VOIs |
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Save the current selection set to a file. |
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Load a selection set from a file. |
VOI Union
The currently selected VOIs can be combined into a larger structure by the Union button. In the example below the selection was first reset by 
, and then all left frontal lobe VOIs selected by checking the Frontal_lobe entry.
Note that the original VOIs are removed during the Union process. This is necessary for the proper functioning of the partial volume correction. However, the VOIs can easily be recovered by stepping to the prior page and activating the Outline button again.
