Hello,

I have downloaded the AAL atlas, and resliced the atlas to voxel size 4x4x4. I noticed that there were 116 ROIs. The mean ROI size is 200, and the Std. Dev. ROI Size is 145, which are different from the numbers shown in the Table "ROI Atlas Comparison" on page http://www.nitrc.org/plugins/mwiki/index...

Could anybody tell me what's going on? Did I do something wrong?

Thanks

Dear Lirong, 

Sorry for the late answer. I have downloaded ADHD200_AAL_TCs_TestRelease from the Athena release. As far as I can see templates/aal_mask_pad.nii.gz has 116 regions, as expected. So I guess there was a typo in the table http://www.nitrc.org/plugins/mwiki/index.php/neurobureau:AthenaPipeline . Also the size of rois is expressed in voxels, so if you reslice the data you will get different sizes. Having said that, the file mentioned above does have a 4x4x4 resolution, and I get different mean/std (261/186) than you, or the table in the documentation. Weird. Unfortunately, as I was not involved in the Athena release, I do not have further information. I will ask Cameron Craddock what he thinks. 

Best,