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Hi,
I would sum up the set of labels you have in (2) if you want the best estimate of ventricular volume.
See the following page for additional info on the various measures:
In particular, I would expect your measure in (2) would be much more correlated with
BrainSegVol - BrainSegVolNotVent than
eTIV - BrainSegVolNotVent
Indeed, the only difference according to the above wiki page between (2) and BrainSegVol - BrainSegVolNotVent should be that the latter includes voxels labelled as "CSF" in the aparc+aseg.mgz
cheers,
-MH
--
Michael Harms, Ph.D.
-----------------------------------------------------------
Conte Center for the Neuroscience of Mental Disorders
Washington University School of Medicine
Department of Psychiatry, Box 8134
660 South Euclid Ave.
Tel: 314-747-6173
St. Louis, MO 63110
Email: mha...@wustl.edu
From: Mayer Kristina <kristina.ma...@kispi.uzh.ch>
Reply-To: 'Freesurfer support list' <freesurfer@nmr.mgh.harvard.edu> Date: Thursday, September 10, 2015 1:23 AM To: "freesurfer-boun...@nmr.mgh.harvard.edu" <freesurfer-boun...@nmr.mgh.harvard.edu>, Bruce Fischl <fis...@nmr.mgh.harvard.edu>, 'Freesurfer support list' <freesurfer@nmr.mgh.harvard.edu> Subject: [Freesurfer] ventricular CSF volumes Dear Freesurfers, I am calculatig with ventricular volumes in aseg.stats.
1. According to the archives Mail calculation of ventricular CSF is is instructed differently: - Bruce Fischl 2007 to Jenifer: Add ventricular volumes including CSF (segid 24): Left Lateral Ventricle (segid 4) + Left Inferior Lateral Ventricle (segid 5) + Right
lateral Ventricle (segid 43) + Right Inf Lateral Ventricle (segid 44) + 3rd Ventricle (segid 14) + 4th Ventricle (segid 15) + 5th Ventricle (segid 72) + CSF (segid 24)
- Bruce Fischl 2007 to Nayoung and 2014: Add choroids plexus to sum of ventricular volumes, but
exclude CSF as in T1 weighted images the CSF cannot be distinguished from bone and would represent sulcal CSF (not ventricular), anyway. >> Which volumes (which segid’s?) shall I include for the total ventricular CSF? 2. When I add up following volumes for ventricular CSF:
Left Lateral Ventricle (segid 4) + Left Inferior Lateral Ventricle (segid 5) + Right lateral Ventricle (segid 43) + Right Inf Lateral Ventricle (segid 44) + 3rd Ventricle (segid 14) + 4th Ventricle (segid 15) +
5th Ventricle (segid 72) + Right choroids plexus (63) + left choroids plexus (31) and then correlate with the following calculated volume:
eTIV – BrainSegVolNotVent the correlation is highly significant (p<0.000) but with a correlation of only r=0.66 (n=47) >> Why are the volumes not the same? Which volumes are the reason for the discrepancy. thanks for advice! Cheers, Kristina The materials in this message are private and may contain Protected Healthcare Information or other information of a sensitive nature. If you are not the intended recipient, be advised that any unauthorized use, disclosure, copying or the taking of any action in reliance on the contents of this information is strictly prohibited. If you have received this email in error, please immediately notify the sender via telephone or return mail. |
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