10 Apr
2017
10 Apr
'17
3:23 p.m.
Doug,
Thank you very much! That helps clear things up for me.
Best,
James
On Mon, Apr 10, 2017 at 2:21 PM, Douglas N Greve greve@nmr.mgh.harvard.edu wrote:
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 <greve@nmr.mgh.harvard.edu mailto:greve@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 > <greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> <mailto:greve@nmr.mgh.harvard.edu <mailto:greve@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. Greve, Ph.D. > MGH-NMR Center > greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> <mailto:greve@nmr.mgh.harvard.edu <mailto:greve@nmr.mgh.harvard.edu> Phone Number: 617-724-2358 <tel:617-724-2358> <tel:617-724-2358 <tel:617-724-2358>> > Fax: 617-726-7422 <tel:617-726-7422> <tel:617-726-7422 <tel:617-726-7422>> > > Bugs: surfer.nmr.mgh.harvard.edu/fswiki/BugReporting <http://surfer.nmr.mgh.harvard.edu/fswiki/BugReporting> > <http://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> > <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> > <http://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/> > <ftp://surfer.nmr.mgh.harvard.edu/transfer/outgoing/flat/greve/
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