open-discussion > Probablistic maps for IIT_bundles?
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Feb 21, 2020  07:02 PM | edorone
Probablistic maps for IIT_bundles?

The files in the latest version (v.5) of "IIT_bundles" are NOT probabilistic maps (i.e., the voxel values are integers, and in particular not probability values that allow a simple thresholding), as opposed to previous versions (for example. 4.1).

What sort of normalization should I apply in order to transform the ROI maps to probabilistic maps? (the manual only explains about spatial normalization, which is irrelevant here since I already have all my files in MNI space). What do the integer values represent? (I only found explanations about the values in IIT_WM_atlas file)

Thank you.
Feb 24, 2020  03:02 AM | Konstantinos Arfanakis - Illinois Institute of Technology
RE: Probablistic maps for IIT_bundles?
Dear edorone,

The values inside the IIT_bundles files represent numbers of streamlines. To threshold a bundle's map, we recommend using 1%-3% of the bundle's maximum value. The higher the threshold, the "thinner' the bundle will appear.

Please let us know if you have additional questions.