dear mr. greve,dear fs community,
REGARDING CSF and CSFVol:
i still don’t understand the whole CSF and CSFVol thing.
it seems to be impossible that CSFVol ist the volume of the CSF label because CSFVol is bigger than CSF.
additional to this aspect the value of the CSF label is a volume itself.
so my questions again: what is the label CSF (aseg.stats) describing? and what does it stands for? cer.spinal.fluid?
what is the label CSFVol (console) describing? and what does it stands for if the CSF label is a volume already?
I’ve been trying to understand the meaning of the CSF (index24) by using freeviewer.. but no chance… for me it seems to be not part of the ventricle system as i know it? maybe you can describe it using an image?
beside that: whats the advantage of this two lables beside getting the whole ventricle volume by adding ventricles (lateral,inferior lateral, 3rd, 4th, 5th)?
REGARDING CC (corpus callosum):
why do you think that the corpus callosum is not a 3D body? of cause it is or what did you mean?
setting the CC parts in free viewer it seems as if it shouldn’t be a big deal to add the separated parts of the CC to one value?!
kind regards,
benjamin luerweg
doctoral student
CSFVol is actually the volume of the CSF label (index 24)3rd4th5thCSF is the volume of the 3rd, 4th, 5th ventricles plus the CSF labelVentChorVol is the volume of choroird plexus, lateral ventricles, and inferior lateral ventricles BrainSegVolNotVent = BrainSegVol - VentChorVol - 3rd4th5thCSF ;On 09/12/2017 02:13 PM, Benjamin Luerweg wrote:Hey Mr. Greve,
thank your very much again!
if i understand you right, the inside the console shown up values
can’t be extracted into a separate file?
beside that, this values are of interest for me, so that i copied them
to a text file.
as you can see:Getting Brain Volume Statistics
...
SubCortGMVol 56306.000
SupraTentVol 963813.403 (960508.000) diff=3305.403 pctdiff=0.343
SupraTentVolNotVent 940278.403 (936973.000) diff=3305.403 pctdiff=0.352
BrainSegVol 1109500.000 (1106935.000) diff=2565.000 pctdiff=0.231
BrainSegVolNotVent 1082437.000 (1082065.403) diff=371.597 pctdiff=0.034
BrainSegVolNotVent 1082437.000
CerebellumVol 145310.000
VentChorVol 23535.000
3rd4th5thCSF 3528.000
CSFVol 963.000,
OptChiasmVol 154.000
MaskVol 1526326.000
am i right that this CSFVol is the Volume of all ventricles not including
the extra cerebral CSF?
i tried to calculate the CSFVol reverse by calculating: VentChorVol -
Choroidplexus(2*) = ..and it didn’t fit with the CSFVol?! why this?
and what exactly is the VentChorVol and 3rd4th5thCSF for?
im a bit confused about all this lables and im sorry for asking you so
much but i would really appreciate to solve this pity situation.
do you have a kind of an overview?
thank you in advance again,
ben 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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