On Wed, 28 Feb 2007, Juranek, Jenifer wrote:

I'd like to compute %GM, %WM, %CSF wrt ICV (eTIV)...including cerebellum gray/white.

Are the values returned by mris_wm_volume and mris_volume for cortical

surfaces only (excluding cerebellum)?

yes, just cortex, and cerebral wm.

So, in this case...

1. are the values in aseg.stats appropriate for both cerebral and

cerebellar fractions?

not sure what you mean by "appropriate". The values in the aseg.stats are for each of the structures in mm^3.

2. should a combination of cortical GM & WM from mris_volume be added to

the cerebellar gm & wm values reported in aseg.stats to get TOTAL_GM and TOTAL_WM?

you'll need other noncortical structures to get total gm (e.g. putamen, pallidum, etc...)

3. is it true that CSF= ICV - GM(cerebral and cerebellar) - WM(cerebral

and cerebellar)

hmmm, there are other things in there as well (e.g. dura), so not quite.

Any advice is greatly appreciated...

Many Thanks, Jenifer Juranek

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