[Freesurfer] Hybrid combination

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Hi,

I want to do tractography on Olfactory bulb in Parkinson Patients but if I use Desikan and Killiany atlas I can't define well Olfactory bulb but cortical parcelation from Desikan is perfect for Neurodegenerative disorders . For functional disorders AAL2 and define Olfactory Bulb is good.

My question is can I combine this two atlases and to have *Combine Parcellations:*

- *Cortical parcellations* from Desikan-Killiany via FreeSurfer. - *Subcortical and white matter parcellations* from the AAL2 atlas

Meaby sound crazy but I think of this and I like to ask does this is possible any way?

Thanks in advance, Best Maja