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Hi,
I'm assuming the .annot is wrong because it doesn't map the entire gray matter ribbon, whereas when the .annot is mapped unto the gray matter ribbon using mri_aparc2aseg, its grabbing the surround gray matter. I am attaching a picture as illustration. This is the rh FG4 (from the Stanford atlas), in the sagittal view. The yellow is the .label file for the FG4, and when its mapped unto the gray matter, the brown region is mapped as the FG4. Is this the procedure that's suppose to happen?
Victor Zeng Beth Israel Deaconess Medical Center Keshavan Lab -- ________________________________ From: freesurfer-bounces@nmr.mgh.harvard.edu freesurfer-bounces@nmr.mgh.harvard.edu on behalf of Douglas N. Greve dgreve@mgh.harvard.edu Sent: Tuesday, November 8, 2022 9:14 AM To: freesurfer@nmr.mgh.harvard.edu freesurfer@nmr.mgh.harvard.edu Subject: [External] Re: [Freesurfer] Mapping the labels onto the aparc atlas
I'm not sure what you are saying. Are you saying that the annot/surf looks right but the seg in the volume looks wrong or that they both look wrong?
On 10/31/2022 2:58 PM, Zeng, Victor (BIDMC - Keshavan - Psychiatry) wrote:
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Hi Freesurfer devs,
We have used mri_aparc2aseg to map the Stanford mpm/vpnl labels unto the gray matter ribbon. We notice that when analyzing the resulting mpm.vpnl+aseg.mgz that the regions/voxels of the mpm.vpnl+aseg.mgz stretch out the corresponding voxels that the labels identify as the mpm/vpnl. Can we reliably use the mpm.vpnl+aseg.mgz, and are the stats created from that file, or from the annot file? We are asking because we are using the mpm.vpnl+aseg.mgz as a mask for blood perfusion measurements.
Thanks,
Victor Zeng Beth Israel Deaconess Medical Center Keshavan Lab --
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