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To get the gray matter and white matter volumes you should use the following formulas: | To get the gray matter volume you should use the following formula: |

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}}} To get the white matter volume the program {{{mris_wm_volume}}} will calculate the wm volume, using the command: {{{ mris_wm_volume based on the formula {{{ |

# Morphometry Stats

## Gray Matter and White Matter Volume

Estimation of the gray matter and white matter volumes should be taken from the surfaces, and not from the aseg. The program mris_volume will compute the volume inside a surface. It should be run from within the <subjid>/surf directory with the following command:

mris_volume ?h.surface

where `?h.surface` is replaced with the specific surface you are looking for the volume of.

To get the gray matter volume you should use the following formula:

gm volume = pial volume - white volume

To get the white matter volume the program `mris_wm_volume` will calculate the wm volume, using the command:

mris_wm_volume based on the formula {{{ wm volume = white volume - (ventricles+caudate+putamen+pallidum+thalamus)*

* the subcortical volumes can be taken from the aseg.stats file.