A question about anatomical templates

[Raymundo.Cassani]

@JiangXinping

Recently in the use of brainstorm, for source localization related work, after doing the source estimation, I want to extract the time series according to the anatomical template division of ROI

What is the source space for your sources?
(cortical) surface, (brain) volume?

@JiangXinping

it is reasonable that it should be AAL116, there are a total of 116 ROIs

This is correct AAL1 has 116 anatomical parcellations.

@JiangXinping

why do I only show 110 here.Has brainstorm improved this template?

The 116 ROIs in AAL116 are defined for voxels in the MNI152 template.
However, once you use that anatomical parcellation to create Brainstorm scouts, which are defined in the source grid rather than in the voxel "grid", the number of Scouts can be smaller:

• If an anatomical parcellation is only few voxels, it may be the case that there is not correspondence to a vertex in the source grid.

• If source grid does not include all the space that is included in the AAL1 anatomical parcellation. E.g, AAL1 has ROIs for Thalamus, but your source space is just cortical surface, there will not be source vertices that correspond to Thalamus, thus that Scout will not be present