Hi, I have calculated relative volume by dividing each volume by the intracranial volume and multiply it with 100. When I add the relative volume of total gray matter, cortical white matter, lateral ventricle, 3rd centricle, 4th ventricle and ventral DC, I get 82-86 %. Can this be caused by the fact that the intracranial volume is much larger than the brain? In which way can motion correction affect volume if I have series where some subjects have to dicom and other just have one dicom serie?
Knut J
Hi Knut
can you check the accuracy of the talairach xform? And what version are you using? Bruce On Tue, 25 Sep 2012, Knut J Bjuland wrote:
Hi, I have calculated relative volume by dividing each volume by the intracranial volume and multiply it with 100. When I add the relative volume of total gray matter, cortical white matter, lateral ventricle, 3rd centricle, 4th ventricle and ventral DC, I get 82-86 %. Can this be caused by the fact that the intracranial volume is much larger than the brain? In which way can motion correction affect volume if I have series where some subjects have to dicom and other just have one dicom serie?
Knut J _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
On 09/25/2012 03:09 PM, Bruce Fischl wrote:
check the accuracy of the talairach xform
Hi
I am using Freesurfer version 5.1 with all bug fixes. I have snapshots off all talairach xforms made through qa_tools. I have seen on a few subjects that the talirach transformation went okay. The pial surface and whitematter surface have aligned with the surfaces on each subject. Can you please describe how I can report this to you as picture or as a text file?
Knut J
freesurfer@nmr.mgh.harvard.edu
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Bruce Fischl -
Knut J Bjuland