DTI Tractography > Visualizing the Fiber Tracks in 3D

The 3D page initially shows the tracks together with the VOIs.

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Note the elements in the Scene tree in the upper right. An objects can be selected in the tree its appearance changed in the lower part. Please refer to the PMOD 3D Tool Users Guide for details about the rendering.

As an example, FA image planes can be added by clicking at Planes in the tree, activating the Orthogonal button for the Add planes, opening the planes locator and finally selecting the FA image.

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Examples with Different VOI Settings

The two VOIs described above will be used for illustrating the effect of various settings on the resulting tracks. The left corpus callosum VOI used for seeding, and the tracking algorithm is configured by the setting below.

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The following results are obtained when changing the role of the ellipse VOI.

Ellipse: NEUTRAL VOI	The scene shows all tracks found with the current algorithm from the seeding VOI.
Ellipse: WAY VOI	By enforcing tracks to pass through the ellipse, the number of resulting tracks is decreased.
Ellipse: END VOI	Enforcing tracks to end within the ellipse VOI results in an empty scene, as none of the tracks fulfills this restriction.
Ellipse: EXCLUDE VOI with CLIP setting	Using the ellipse VOI for clipping results in all tracks being shown but clipped at the level of the ellipse.
Ellipse: EXCLUDE VOI with DISCARD setting	When discarding all tracks passing the ellipse only few tracks remain in the scene.