Hello,
When I look at the BrainSegVol and BrainSegVolNotVent in wmparc.stats, the values are around 200,000 - 300,000. However, when I look at the same measures in aseg.stats, the values are around 1,100,000 - 1,500,000. When I sum up the individual ROIs in wmparc, it comes out to >1L. I am currently using freesurfer 4.3.1. When I look at the aseg.stats files from freesurfer 3.0.5, ran on the same subjects, the values are up around that 1 - 1.5L range. This is consistent across all of our subjects: > 100 and from two different scanners at two locations.
From my wmparc file:
# Measure BrainMask, BrainMaskNVox, Number of Brain Mask Voxels, 1774481, unitless # Measure BrainMask, BrainMaskVol, Brain Mask Volume, 1774481.000000, mm^3 # Measure BrainSegNotVent, BrainSegVolNotVent, Brain Segmentation Volume Without Ventricles, 243312.000000, mm^3 # Measure BrainSeg, BrainSegNVox, Number of Brain Segmentation Voxels, 275688, unitless # Measure BrainSeg, BrainSegVol, Brain Segmentation Volume, 275688.000000, mm^3 # Measure IntraCranialVol, ICV, Intracranial Volume, 1302696.178406, mm^3
My question is why would wmparc so severely underestimate the BrainSegVol measure? If I can not fix it, should I take the BrainSegVol from the aseg.stats file?
Thank you! Jeff Sadino
bump :)
On Tue, Nov 9, 2010 at 11:38 AM, Jeff Sadino jsadino.queens@gmail.comwrote:
Hello,
When I look at the BrainSegVol and BrainSegVolNotVent in wmparc.stats, the values are around 200,000 - 300,000. However, when I look at the same measures in aseg.stats, the values are around 1.1L - 1.5L. When I sum up the individual ROIs in wmparc, it comes out to >1L. I am currently using freesurfer 4.3.1. When I look at the aseg.stats files from freesurfer 3.0.5, ran on the same subjects, the values are up around that 1 - 1.5L range. This is consistent across all of our subjects: > 100 and from two different scanners at two locations.
From my wmparc file: # Measure BrainMask, BrainMaskNVox, Number of Brain Mask Voxels, 1774481, unitless # Measure BrainMask, BrainMaskVol, Brain Mask Volume, 1774481.000000, mm^3 # Measure BrainSegNotVent, BrainSegVolNotVent, Brain Segmentation Volume Without Ventricles, 243312.000000, mm^3 # Measure BrainSeg, BrainSegNVox, Number of Brain Segmentation Voxels, 275688, unitless # Measure BrainSeg, BrainSegVol, Brain Segmentation Volume, 275688.000000, mm^3 # Measure IntraCranialVol, ICV, Intracranial Volume, 1302696.178406, mm^3
My question is why would wmparc so severely underestimate the BrainSegVol measure? If I can not fix it, should I take the BrainSegVol from the aseg.stats file?
Thank you! Jeff Sadino
Jeff, Yes, you would only want to take it from the aseg.stats. I believe this is fixed or on the list to be fixed for future versions. Allison
freesurfer@nmr.mgh.harvard.edu
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Allison Stevens -
Jeff Sadino