Just to clarify a bit further, in the asegstats2table there are values given for TotalGrayVol. I am assuming this includes both subcortical and cortical measures for GM along with cerebellar values, etc. Likewise, I am looking for TotalWhiteVol or a way of calculating both cortical and subcortical measures of White Matter along with deep tissue values such internal capsules. Your response gives me CorticalWhiteMatterVol, as shown in the output. However, I am looking for Total Cerebral White Matter. Specifically, we want cortical white matter and the volume of deeper cerebral white matter structures like internal capsule etc. Which label is ascribed to these deeper volumes?

Elizabeth Adeyemi [C] | Research Assistant, NIMH Email: adeyemiei@mail.nih.govmailto:adeyemiei@mail.nih.gov Office: 301-451-9243 | Fax: 301-480-8898 9000 Rockville Pike, Room 4C110, Rockville, MD 20892

On Mar 19, 2014, at 6:27 PM, Douglas N Greve wrote:

If you want total cerebral WM, then use the values in aseg.stats

# Measure lhCorticalWhiteMatter, lhCorticalWhiteMatterVol, Left hemisphere cortical white matter volume, 182991.109375, mm^3 # Measure rhCorticalWhiteMatter, rhCorticalWhiteMatterVol, Right hemisphere cortical white matter volume, 196871.406250, mm^3 # Measure CorticalWhiteMatter, CorticalWhiteMatterVol, Total cortical white matter volume, 379862.515625, mm^3

On 03/19/2014 05:48 PM, Adeyemi, Elizabeth (NIH/NIMH) [C] wrote: Hello,

I need assistance calculating Total White Matter. Can I simply add Cortical White Matter + Unsegmented White Matter (given in the aseg wmparc output)?

Thanks

Elizabeth Adeyemi

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Hi Elizabeth, The measure called "CorticalWhiteMatterVol" *is* the total cerebral white matter. See this page: http://freesurfer.net/fswiki/MorphometryStats

The values for the "{lh,rh}CorticalWhiteMatterVol"measures in aseg.stats used to be the same as that returned by the 'mris_wm_volume' function, although that changed as of FS 5.2. (Doug: Why is the output of 'mris_wm_volume' no longer in sync with the output from 'mri_segstats'? What differs between the two calculations?)

cheers, -MH

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On 3/21/14 1:49 PM, "Adeyemi, Elizabeth (NIH/NIMH) [C]" elizabeth.adeyemi@nih.gov wrote:

Thank you for your response. But just to clarify a bit further, in the asegstats2table there are values given for TotalGrayVol. I am assuming this includes both subcortical and cortical measures for GM along with cerebellar values, etc. Likewise, I am looking for TotalWhiteVol or a way of calculating both cortical and subcortical measures of White Matter along with deep tissue values such internal capsules, etc. Your response gives me CorticalWhiteMatterVol, as shown in the output. However, I am looking for Total Cerebral White Matter. Specifically, I want cortical white matter and the volume of deeper cerebral white matter structures like internal capsule etc. Which label is ascribed to these deeper volumes?

...

Elizabeth Adeyemi On Mar 19, 2014, at 6:27 PM, Douglas N Greve wrote:

If you want total cerebral WM, then use the values in aseg.stats

# Measure lhCorticalWhiteMatter, lhCorticalWhiteMatterVol, Left hemisphere cortical white matter volume, 182991.109375, mm^3 # Measure rhCorticalWhiteMatter, rhCorticalWhiteMatterVol, Right hemisphere cortical white matter volume, 196871.406250, mm^3 # Measure CorticalWhiteMatter, CorticalWhiteMatterVol, Total cortical white matter volume, 379862.515625, mm^3

On 03/19/2014 05:48 PM, Adeyemi, Elizabeth (NIH/NIMH) [C] wrote: Hello,

I need assistance calculating Total White Matter. Can I simply add Cortical White Matter + Unsegmented White Matter (given in the aseg wmparc output)?

Thanks

Elizabeth Adeyemi

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