It is, but it can be either easy or hard. The easy way is to draw it on gtmseg.mgz and add an entry into gtmseg.ctab. Probably, you should copy the gtmseg.{mgz,ctab} to a new file and edit that. Otherwise, you can edit, eg, apas+head.mgz, and pass that to gtmseg with the --head option. At some point, the the ctab will need to be updated or gtmseg will fail. We will be updating this part to make it easier in the next year.

On 11/23/2020 4:27 PM, Jessica Cooperrider wrote:

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Hello,

I would like to draw a volume of interest on T1 images and then evaluate metabolism changes in this region. Is this possible to accomplish using PETSURFER?

Thank you for your time,

Jess
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