sorry, I would use these two TVV = left lateral ventricle + left inf lateral ventricle + right lateral ventricle + right inf lateral ventricle + 3rd ventricle + 4th ventricle + 5th ventricle + choroid plexus
TBV = BrainSegVolNotVent On 04/10/2017 09:43 AM, Gullickson, James wrote: > Hi Doug, > > To clarify: to calculate VBR, I need two things: a measure of TBV > /and/ and measure of TVV. I'm just wondering what the best way to > derive each of these is. > > Thanks, > > James > > On Fri, Apr 7, 2017 at 11:24 AM, Douglas N Greve > <gr...@nmr.mgh.harvard.edu <mailto:gr...@nmr.mgh.harvard.edu>> wrote: > > 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> > <mailto: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> > > <mailto: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> > > <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer > <https://mail.nmr.mgh.harvard.edu/mailman/listinfo/freesurfer>> > > > > -- > > Douglas N. 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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> > > <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 > <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> > > > > > _______________________________________________ > 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
