Hi, experts,
I am interested in only the positive sulc and would like to make group
analysis of the postive sulc values. Hence I would like to mask off the
negative values (as the lh.sulc file has both positive and negative value).
Before making group analysis, I have to resample and smooth the sulc value. How
do I smooth the positive sulc in a way that the negative sulc values will not
have an effect on the smoothing process? Example if I smooth the positive
sulc directly with the negative values, it will have some effect on the
positive values since gyri and sulci are alternating.
you suggest me using mri_binarize and mri_fwhm to make a mask and smooth it
with a mask.
As suggested, I have done so.
However, there is a problem I can not tackle.
Using mri_binarize --i lh.sulc --min 0 --o lh.such.mask.mgh
When I read the lh.such.mask.mgh into matlab so that I can see the data inside.
To my surprise, I saw a vector which contains nearly all 0's except some very
small numbers like 1.401298464324817e-45, not binary file which contains only
0's and 1's.
I further tried:
mri_binarize --i lh.sulc --min 0 --o lh.such.mask.mgh --binval 1
It has the same problem as above.
After launching:
mris_fwhm --i sulc --subject Ad001 --surf white --mask lh.such.mask.mgh --hemi
lh --fwhm 20 --o lh.sulc.mgh
I read lh.sulc.mgh into matlab, it contains all 0's.
I read the mgh file using Keith worsley's SurfStatReadData function.
I do not know where it is wrong.
Thank doug for your helpful suggestions!
Thank you very much!
yuanchao
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