I would use the TVV
On 04/06/2017 06:28 PM, Gullickson, James wrote: > Doug, > > Thanks for your reply. > > Difference between the two TVV methods ranges between 1-6% > Difference between the two TBV methods ranges between 2-4% > > Basically, my question is two-fold: > > a) what is the most accurate representation of total ventricular volume > b) what is the most accurate representation of total brain volume (all > parenchyma) > > Best, > > James > > On Thu, Apr 6, 2017 at 3:17 PM, Douglas N Greve > <gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu>> wrote: > > that looks right. how different are the values? > > > On 04/05/2017 10:58 AM, Gullickson, James wrote: > > Hello all, > > > > I want to calculate a Ventricle-to-Brain ratio (VBR) as a measure of > > parenchymal atrophy using Freesurfer version 5.3.0. I have tried > to go > > about this using the aseg.stats output (using asegstats2table), > but am > > running into inconsistencies. > > > > The basic calculation for VBR is: > > > > (Total Ventricular Volume/Total Brain Volume) * 100 > > > > i.e. Bigler, E. D. (2013). Traumatic brain injury, neuroimaging, and > > neurodegeneration. /Frontiers in human neuroscience/, /7/, 395. > > > > > > What is the best way to get Total Ventricular Volume (TVV) and Total > > Brain Volume (TBV) for this calculation? I have tried several ways, > > which lead to different values: > > > > TVV = left lateral ventricle + left inf lateral ventricle + right > > lateral ventricle + right inf lateral ventricle + 3rd ventricle > + 4th > > ventricle + 5th ventricle + choroid plexus > > > > which gives me a different result than > > > > TVV = BrainSegVol - BrainSegVolNotVent > > > > > > and for TBV > > > > TBV = TotalGrayVol + CorticalWhiteMatterVol > > > > which differs from > > > > TBV = BrainSegVolNotVent > > > > > > Thank you for your help, > > > > James Gullickson > > > > > > > > > > > > _______________________________________________ > > Freesurfer mailing list > > Freesurfer@nmr.mgh.harvard.edu > <mailto:Freesurfer@nmr.mgh.harvard.edu> > > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer> > > -- > Douglas N. Greve, Ph.D. > MGH-NMR Center > gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu> > Phone Number: 617-724-2358 <tel:617-724-2358> > Fax: 617-726-7422 <tel:617-726-7422> > > Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting > <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> > FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 > <https://gate.nmr.mgh.harvard.edu/filedrop2> > www.nmr.mgh.harvard.edu/facility/filedrop/index.html > <http://www.nmr.mgh.harvard.edu/facility/filedrop/index.html> > Outgoing: > ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ > <ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/> > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu <mailto:Freesurfer@nmr.mgh.harvard.edu> > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > <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 > <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. > > > > > _______________________________________________ > Freesurfer mailing list > Freesurfer@nmr.mgh.harvard.edu > https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer -- Douglas N. Greve, Ph.D. MGH-NMR Center gr...@nmr.mgh.harvard.edu Phone Number: 617-724-2358 Fax: 617-726-7422 Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting FileDrop: https://gate.nmr.mgh.harvard.edu/filedrop2 www.nmr.mgh.harvard.edu/facility/filedrop/index.html Outgoing: ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/ _______________________________________________ Freesurfer mailing list Freesurfer@nmr.mgh.harvard.edu https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer
