Dear Freesurfers, I am calculatig with ventricular volumes in aseg.stats. 1. According to the archives Mail calculation of ventricular CSF is is instructed differently: - Bruce Fischl 2007 to Jenifer: Add ventricular volumes including CSF (segid 24): Left Lateral Ventricle (segid 4) + Left Inferior Lateral Ventricle (segid 5) + Right lateral Ventricle (segid 43) + Right Inf Lateral Ventricle (segid 44) + 3rd Ventricle (segid 14) + 4th Ventricle (segid 15) + 5th Ventricle (segid 72) + CSF (segid 24) - Bruce Fischl 2007 to Nayoung and 2014: Add choroids plexus to sum of ventricular volumes, but exclude CSF as in T1 weighted images the CSF cannot be distinguished from bone and would represent sulcal CSF (not ventricular), anyway.
>> Which volumes (which segid's?) shall I include for the total ventricular CSF? 2. When I add up following volumes for ventricular CSF: Left Lateral Ventricle (segid 4) + Left Inferior Lateral Ventricle (segid 5) + Right lateral Ventricle (segid 43) + Right Inf Lateral Ventricle (segid 44) + 3rd Ventricle (segid 14) + 4th Ventricle (segid 15) + 5th Ventricle (segid 72) + Right choroids plexus (63) + left choroids plexus (31) and then correlate with the following calculated volume: eTIV - BrainSegVolNotVent the correlation is highly significant (p<0.000) but with a correlation of only r=0.66 (n=47) >> Why are the volumes not the same? Which volumes are the reason for the >> discrepancy. thanks for advice! Cheers, Kristina
_______________________________________________ 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.
