hi, Now I use the parahippocampal gyrus gray matter volume to divide the total gray matter volume,after that I use the ratio to do the statistics. I think though this procedure can adjust the head size for individual subjects. Am I riht? or I can do like this way?
Bests hankee
hankee，duhanjian@sohu.com 2007-04-29
Hi Hankee,
For the parahippocampal gyrus, I would do the following to correct for head size:
Raw Parahippocampal volume (as derived from aparc.stats)/ICV (as derived from aseg.stats)
Best,
rahul
hi, Now I use the parahippocampal gyrus gray matter volume to divide the total gray matter volume,after that I use the ratio to do the statistics. I think though this procedure can adjust the head size for individual subjects. Am I riht? or I can do like this way?
Bests hankee
hankee£¬duhanjian@sohu.com 2007-04-29 _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
yes, that will work. It will be a bit conservative (that is, if the overall brain is shrinking then you will underestimate the true effects) On Wed, 2 May 2007, hankee wrote:
hi, Now I use the parahippocampal gyrus gray matter volume to divide the total gray matter volume,after that I use the ratio to do the statistics. I think though this procedure can adjust the head size for individual subjects. Am I riht? or I can do like this way?
Bests hankee
hankee£¬duhanjian@sohu.com 2007-04-29
freesurfer@nmr.mgh.harvard.edu
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Bruce Fischl -
hankee -
rahul＠nmr.mgh.harvard.edu