Hi Yuko - Option 3, using the same FA threshold to create a mask for all measures makes sense.
a.y
On Wed, 19 Mar 2014, Yuko Yotsumoto wrote:
Hello FreeSurfer experts,
I have a question regarding DTI analysis.
I understand that FA values ranges 0-1, and the values are often thresholded by 0.2. Now I am asked to report ADC, RD, AD values in my ROIs, and wondering what would be the most reasonable way.
[1] Do not apply thresholds, just average the values within a ROI. [2] Use some arbitrary thresholds to each of ADC, RD, AD. [3] create a mask that contains voxels of the above-threshold-FAvalues, then, calculate mean within the mask.
Any suggestions?
Best, Yuko Yotsumoto
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