Dear all,
I want to get grey matter, white matter and CSF volume measurements from a specific ROI which is 20 x 20 x 20 mm. I used
FAST to segment the whole brain and got the three classes images (i.e. pve_0, pve_1, pve_2). Then in order to look the specific volume I created an ROI for each tissue. For example for grey matter
fslroi struct_brain_pve_1 struct_brain_GM x 20 y 20 z 20
then output for each tissue with:
fslstats struct_brain_GM -M -V
However, when I look at the volume estimates for each tissue they add up to approx 10700 cm3, which is impossible since a 20 x 20 x 20 volume has 8000 cm3....
Is the method I am using correct or am I missing something really obvious?
Many thanks in advance
Elias
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