Hi Gianluca, > I am working with data coming from two different versions of Freesurfer, v5.1 > and v6. > As measurements looks different (an excerpt below from aseg.stats files), I > am trying to see if that difference is statistically relevant. > Could you anticipate something with this respect?
We do not advise you to include data processed with different versions in the same study as there are differences between our releases. > One more question is about voxel counting and their volume. aseg.stats prints > out that # VoxelVolume_mm3 1 > but volumes from v.6 seems to be sometimes greater sometimes lower than the > voxel number, > while in v. 5.1 they correspond. > Could you give me some clarification? I do not understand your question. Are you asking about the volume differences between the two versions? Lilla > > v.6 > > # ColHeaders Index SegId NVoxels Volume_mm3 StructName normMean normStdDev > normMin normMax normRange > 1 4 5424 5779.6 Left-Lateral-Ventricle 22.1768 > 15.6303 0.0000 81.0000 81.0000 > 2 5 198 225.9 Left-Inf-Lat-Vent 43.8838 > 14.0865 6.0000 77.0000 71.0000 > 3 7 17444 18248.8 Left-Cerebellum-White-Matter 80.5691 > 8.7322 20.0000 133.0000 113.0000 > 4 8 69258 69340.7 Left-Cerebellum-Cortex 49.2701 > 12.9332 0.0000 128.0000 128.0000 > 5 10 8758 8432.7 Left-Thalamus-Proper 81.4639 > 10.8500 37.0000 123.0000 86.0000 > > v. 5.1 > > # ColHeaders Index SegId NVoxels Volume_mm3 StructName normMean normStdDev > normMin normMax normRange > 1 4 5013 5013.0 Left-Lateral-Ventricle 16.7825 > 16.6860 0.0000 82.0000 82.0000 > 2 5 161 161.0 Left-Inf-Lat-Vent 39.9084 > 12.2446 7.0000 73.0000 66.0000 > 3 7 19250 19250.0 Left-Cerebellum-White-Matter 83.1263 > 8.1640 41.0000 110.0000 69.0000 > 4 8 60246 60246.0 Left-Cerebellum-Cortex 50.8222 > 10.7915 5.0000 93.0000 88.0000 > 5 10 7911 7911.0 Left-Thalamus-Proper 88.1600 > 10.4226 43.0000 134.0000 91.0000 > > > > > _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer The information in this e-mail is intended only for the person to whom it is addressed. If you believe this e-mail was sent to you in error and the e-mail contains patient information, please contact the Partners Compliance HelpLine at http://www.partners.org/complianceline . If the e-mail was sent to you in error but does not contain patient information, please contact the sender and properly dispose of the e-mail.
