Hi Tom - These are reasonable values for mean diffusivity (a.k.a. ADC). Only FA is normalized to take values in the 0-1 range.
a.y On Wed, 11 Feb 2015, Thomas Potrusil wrote:
Dear FreeSurfers! A question concerning DTI analysis came up: I already run dt_recon on my dataset which works very well. I also used the output to extract FA-values of distinct ROIs - no Problem. Now I want to do the same for ADC but I only get values in my .stats files like 0.0007 or 0.0008. I use the following code: dt_recon --i $dcmfile --b bvals bvecs --s $subj --o $outdir_dt_recon mri_vol2vol --mov $outdir_dt_recon/adc.nii \ --reg $outdir_dt_recon/register.dat \ --fstarg --interp nearest \ --o $outdir_dt_recon/adc.anat.mgh mri_segstats \ --seg $SUBJECTS_DIR/$subj/mri/wmparc.mgz \ --ctab $FREESURFER_HOME/FreeSurferColorLUT.txt \ --id 12 --id 51 --id 2 --id 41 --id 16 --id 13 --id 52 --id 27 --id 59\ --i $outdir_dt_recon/adc.anat.mgh --seg-erode 1 --sum $outdir_dt_recon/adc.stats When I load adc.anat.mgh into FreeView and scroll to a ROI, I can see a value like 0.000770333! This means (for me) that the value is 'there' but has to be multiplied by 10^3?! Do you have any suggestions how I can get these values to a .stats file? Thanks a lot, Tom
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