Voxel Editing


Voxel editing is similar to that found in a image editing program.

Voxel Operations

This section provides voxel operations for editing the voxels. Tooltips on each of the controls describe their operations. For a functional volume, a voxel is on when its value is non-zero; off is zero. For a label volume, a voxel is on when its label is not ???; off is the label ???.

Options

The options allow creating a new volume file, adding a new map to an existing volume file, setting the brush (number of voxels affected by a mouse click), and the value to which voxels are set.

File

Brush

The brush determines the voxels turned on or off when using the mouse when the Operation is set to On or Off. When 1, only the voxel under the mouse changes its value. When 3 (5, 7, 9, ...), the voxel under the mouse and the adjacent voxels in the 2 (4, 6, 8, ...) neighboring slices are turned on or off.

Value

Create Volume Dialog

The Create Volume dialog is used to create a new volume file for editing. It is important that this new volume has the same spatial characteristics (dimensions, origin, and spacing) as the anatomical volume that servers as the underlay volume. This enures that there is one-to-one correspondence between the volume that is edited and the anatomical volume that is under the edited volume.
To create a new volume:
  1. Set the name of the volume file. Click the Select button to set the correct directory for the volume file.
  2. Set the Volume Type to either Label (most common) or Functional.
  3. Set the Number of Maps (usually 1).
  4. In the Voxels section, click the File button to display a dialog containing all volume files in memory. Select the anatomical volume that will serve as the underlay for voxel editing. This will set the correct values for the dimensions, origin, and spacing.
  5. In the Voxels section, click the Resample button to change the spacing (size of voxels) with automatic update of Dimensions and Origin while maintaining the same voxel extent.