Introduction
DSI Studio provides useful functions to edit the generated tractography, including "Select", "Delete", and "Cut". Such 3D interactive functions provide users ways to select fibers of interest, exclude false fibers, or even cut the fiber to facilitate analysis.
Tract Selection (Ctrl+S)
As shown in the figure to the right, DSI Studio select the tracts that pass through the "selection plane", which is determined by the location of the mouse down and mouse up position on the screen.
The steps to carry out selection are as follows:
1. select "Edit" -> "Select" or press Ctrl + S
2. Move the cursor to the starting point of selection plane on the screen.
3. Press the left button of the mouse and move the cursor to the ending point of the selection plane.
4. Release the button and the selection will be performed immediately.
As the example shown by the figure to the right, the selection plane will cull the tracts that passes through it. In this case, the corpus callosum will be selected whereas other fiber bundles will be deleted.
Tract Deletion (Ctrl+D)
Tract deletion is carried out as the same manner except that the selected tracts will be deleted. The deletion can be undo by press Ctrl+Z.
Tract Cutting (Ctrl+X)
Tract cutting is to cut the selected tracts into two parts. This function is useful in condition like the users want to analyze only the right corpus callosum. The corpus callosum can be cut into two parts by a sagittally placed selection plane. The right corpus callosum is then selected to perform further analysis.
Another condition to apply tract cutting is that only a section of the fiber bundle is to be analyzed, or the users want to align the fiber bundle. In such case, a interested portion of the fiber bundle can be extracted by tract cutting.
*Note that the tract cutting cannot be undone.
Tract Painting (Ctrl + P)
Tract Painting offers a way to visualize the tracts through applying different color. To perform this task, press Ctrl+P and assign the painting color. Select the tracts that will be painted as explained in the tract selection section. Then change the tract coloring option to "manual assigned" to visualize the color.
