On 09/12/2017 09:06 AM, Benjamin Luerweg wrote:
dear mr. Greve, dear fs community,
first of all thank you very much for helping me so far.
what i don’t understand is the difference between the value *CSF* (within the aseg.stat) and the *CSFVol* which shows up inside the console while processing the command to generate the aseg.stat file.
The "CSF" label is a small ROI of CSF that did not fit into any of the standard ventricle definitions. It is not well-named and creates confusion.
additional to this i would like to know why some of this values directly showing up inside the console are not included/part of the final aseg.stat?! is there a different way to get a file which includes this morphometric data? (because like i told you: for example the aseg.stat value CSF differs from the inside the console shown value CSFVol (which is not part of aseg))
There is not a way to get the data from the console. However, you can compute *BrainSeg-**BrainSegNotVent to get venticular CSF volume *
regarding to this ratio which i need its the *VBR* i meant (https://en.wikipedia.org/wiki/Ventricular-brain_ratio) whats the *best way to calculate this value?* which parameters should i use?
Not sure. I guess it would be CSFVol/BrainSeg or CSFVol/BrainSegNotVent
my last question is about how to calculate the whole corpus calosum volume - is it possible to add all CC values to a value for the complete CC?
I'm not sure that CC "volume" is meaningful since the CC is not really a 3D structure. Maybe you want to use CC surface area?
thank your very much in advance, benjamin luerweg
Am 11.09.2017 um 22:01 schrieb Douglas N Greve <greve@nmr.mgh.harvard.edu mailto:greve@nmr.mgh.harvard.edu>:
On 09/11/2017 01:20 PM, Benjamin Luerweg wrote:
dear fs community,
as a kind of a freesurfer greenhorn i would kindly ask you to help me out with identifying the different labels used by freesurfer. after using mri segstats most of the labels seem to be describing thereselfs in proper way.
what i don’t understand are for example the different volume values showing up inside the console after entering the segstat command.
VentChorVol what does this label explain?
Volume of all ventricles plus the volume of the chorioid plexus.
CSFVolwhy is this volume differing to the one within the segstat file?
Volume of all ventricles (not well named because it does not include extra cerebral CSF)
and finally i would really love to know how to calculate a correct brain to liquor ratio?!
Do you mean brain volume to total CSF volume? See above
kind regards, ben
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