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= Selections/Labels =  = Selections/Labels =

Selections/Labels

Selections are also called labels or ROIs. You can read or write selections from and to label files or create them from within TkMedit. Note that there is only one selection in TkMedit, even though it doesn't have to be contiguous.

Display Options

Selections are drawn as a green overlay. This overlay can be turned off by unchecking Views, Selection / Label.

Selecting and Deselecting

You can select and deselect voxels with the Select Voxels Tool, which can be activated by pushing the button on the Main Toolbar, by choosing Tools, Select Voxels, or by pressing the 's' key.

This tool is a brush tool, so it uses the global brush settings available in Tools, Configure Brush Shape... and in the Reconstruction Toolbar. You can think of selecting and deselecting voxels as painting your selection. To select voxels, use mouse button 2 to draw your selection and button 3 to erase it.

You can also use a flood fill to select and deselect contiguous areas. Open the configuration dialog box with the Tools, Configure Flood Select...command. Here, you have options for the making the fill 2D or 3D, settings the source, and the fuzziness and distance parameters.

Source Volume: Specifies which volume to use when looking for similar voxels, so that the Main, Aux, or segmentation volumes can be used to look for regions.

Fuzziness: Determines the level of similarity to consider when finding regions. If it is 0, only voxels with exactly the same value as the voxel clicked will be set. If it is greater than 0, this is the maximum value difference from the clicked voxel that a contiguous voxel can have to be considered in the same region.

Distance: Determines the maximum size of the region to fill from the clicked voxel. If it is 0, there will be no distance limit.

3D: Determines if the fill is in-plane only or will fill in three dimensions.

Once you have configured your fill, perform it with shift-mouse button-2 or 3; 2 will select an area, and 3 will deselect an area.

Saving and Loading

TkMedit reads and writes label files. This file format is basically a list of points in RAS coordinate space with some header information. They can be loaded into TkSurfer if they intersect with a surface.

TkMeditGuide/TkMeditWorkingWithData/TkMeditSelectionsLabels (last edited 2011-06-27 13:01:23 by LouisVinke)