Re: [Freesurfer] Total GM and WM volumes

-- On Wed, 27 Oct 2010, Ed Gronenschild wrote: > Hi Allison, > > Thanks. > It is still confusing: for the gm the aseg.stats lists cortical as > well as subcortical and the total volumes (being the sum of both). > But for wm only cortical volumes are present. Is there no > subcortical wm volume present or defined? > > Ed > > On 27 Oct 2010, at 15:58, Allison Stevens wrote: > >> Ed, >> I would use the values in the aseg.stats. I'm not sure why there is >> this >> difference (Doug might be able to elaborate on how the values in >> aseg.stats are calculated) but for v5.0, we went over how all the >> stats >> were being calculated and make sure the values in the aseg.stats >> were the >> most accurate. >> Allison >> >> -- >> >> On Wed, 27 Oct 2010, Ed Gronenschild wrote: >> >> > Dear Bruce/Allison, >> > >> > Could you please try to give response to my question >> > which wm and gm volumes I shoud use, see my >> > today's submission below. >> > >> > Ed >> > >> > On 27 Oct 2010, at 14:41, freesurfer-request@nmr.mgh.harvard.edu >> > wrote: >> > >> > > Dear Christian, >> > > >> > > Thanks for your suggestion. I followed the instructions to derive >> > > the >> > > GM and WM volumes. Here are the (rounded-off) results for one >> > > example: >> > > >> > > mris_volume lh.pial: 532767 >> > > mris_volume rh.pial: 536127 >> > > >> > > mris_wm_volume lh: 251139 >> > > mris_wm_volume rh: 254730 >> > > >> > > Accordingly: >> > > gm lh = 532767 - 251139 = 281628 >> > > gm rh = 536127 - 254730 = 281397 >> > > >> > > Left + right: >> > > total = 1068894 >> > > wm = 505869 >> > > gm = 563025 >> > > >> > > ------------ >> > > >> > > The aseg.stats file lists the following results: >> > > >> > > cortical wm lh: 251139 >> > > cortical wm rh: 254730 >> > > total wm: 505869 >> > > >> > > cortical gm lh: 263888 >> > > cortical gm rh: 265231 >> > > total cortical gm: 529119 >> > > subcortical gm: 181270 >> > > total gm: 710389 >> > > >> > > -------------- >> > > >> > > For wm both results are equal but for gm they are not. >> > > >> > > So now my question still exists: which wm and gm volumes should I >> > > take? >> > > >> > > Ed >> > > >> > > >> > > On 26 Oct 2010, at 20:40, freesurfer-request@nmr.mgh.harvard.edu >> > > wrote: >> > > >> > > > Dear Ed, >> > > > >> > > > to my knowledge, "mris_wm_volume" is the best option to determine >> > > > the >> > > > white matter volume. >> > > > >> > > > See this wiki page for usage: >> > > > http://surfer.nmr.mgh.harvard.edu/fswiki/MorphometryStats >> > > > >> > > > Best wishes, >> > > > Christian >> > > > >> > > > >> > > > --- >> > > > Christian Scheel >> > > > Department of Psychiatry >> > > > University of Cologne >> > > > >> > > > >> > > > >> > > > >> > > > Am 26.10.2010 15:22, schrieb Ed Gronenschild: >> > > > > Hi, >> > > > > >> > > > > I post this once again because I didn't get any response. >> > > > > >> > > > > In the v5.0.0 aseg.stats file I can find the following volumes: >> > > > > >> > > > > - left/right cortical gray matter >> > > > > - subcortical gray matter >> > > > > - total cortical gray matter >> > > > > - total gray matter volume >> > > > > and >> > > > > - left/right cortical white matter >> > > > > - total cortical white matter >> > > > > >> > > > > How can I derive the total white matter volume? >> > > > > >> > > > > Ed >> > > > >> > > >> > >> >> >> 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. >> >