Dear Gari, The subfield module uses a different, independent method to segment the hippocampus, and consistency with ASEG results is not explicitly enforced. That said, the subfield module is inialialized with the ASEG, and the results should be pretty close to each other, for the most part. Have you visually inspected the segmentation for those cases in which the difference looks large? Thanks, /Eugenio
On Mon, 2013-02-25 at 14:10 +0100, Garikoitz Lerma-Usabiaga wrote:
Hi, I am calculating hippocampus volumes with 5.2 in CentOS 4.
I compare volumes (the same apply for lh and for rh) when calculating as:
Left.Hippocampus value in 1mm3 from aseg.stats I use the method kvlQuantifyHippocampalSubfieldSegmentations.sh and
obtain the nonPartialVolumeStatsLeft.txt, divide each value by 8 in order to get mm3, and sum every column except left_hippocampal_fissure.
I obtain quite different values, for example:
row.names lh.aseg lhHIP rh.aseg rhHIP 1 S_00 4848.8 3828.187 4878.8 3767.739 2 S_02 4153.8 3371.517 4547.6 3389.918
Am I doing anything wrong? Should I calculate the hippos subfields volumes differently?
Many thanks! Gari _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer