Hello,

When opening a lesion map on an atlas template and using descriptive statistics to show the regions involved in the lesion, one of the columns in the output is called FractNotZero. Do you know what this column means? is it the fraction of Structure Impacted by Lesion or the fraction of Lesion in each Structure?

Thanks,
Shir

An voxel without a drawing/overlay are considered to have a value of zero, those with some overlay are considered to have a value of 1. Therefore, if 90% of the region is marked with a drawing, the fraction would be 0.9.

You may want to consider trying out the more modern MRIcroGL. It will provide similar descriptives:

Background image: aal
Regions:
TotalVoxelsNotZero 291
Background image: aal
Index Name numVox numVoxNotZero fracVoxNotZero
1 "Precentral_L" 28174 291 0.010328671894967556

Thank you for your help!
Shir