Hi Kim, yes it is surface area times thickness. A volume at each vertex
is computed as the average area of the triangles around the vertex times
the thickness at that vertex. The volume of a parcellation is then the
sum of the volumes of the vertices in that parcellation.
doug
On 1/15/13 9:03 PM, KimMJ wrote:
Dear experts
I'm currently preparing a paper using the results of automatic
volumetric segmentation of subcortical and cortical grey matter
structures from aseg.stats and aparc.stats files.
I have cited previous article by Desikan RS, et al (Neuroimage
2006;31:968-980) for the cortical GM volumetric segmentation, and
Fischl B, et al (Neuron 2002;33:341-355) for the subcortical GM
volumetric segmentation.
At this point, my question is how volumes of these structures
calculated. Is this volume of each GM structure based on surface area
multiplied by cortical thickness?
Apology for the newbie's question.
Thank you in advance for your help.
Kim MJ
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