Dear Bruce and others, We have just ran into strange ICV volumes.
For all our 100+ subjets, the total icv is around 1500cm3 (around 1300-1700). For the new group (only 7 subjects) the average ICV is around 1200 (ranging from 900-1500). This is almost microcephalia, but they are normal. If we take a look at the brainseg volume or brain mask volumes they are larger than the total ICV (for e.g. subject 5 has brainmaskvol: 1440; brainseg vol: 1021; ICV 1036) This is not right. It's kind'a strange that someone has bigger brain than skull :) I was using freesurfer 4.5 for both groups. Do you have any idea what did I miss? Thanks, Gergo 2011/10/3 Bruce Fischl <fis...@nmr.mgh.harvard.edu> > The stuff outside the pial surface won't affect things, which is one of the > reasons we prefer the surface-based measured of cortical morphometry. > > Similarly, we don't use the surface-based stuff in the hippocampus, so you > should be all set (since many of the cortical assumptions aren't valid > there) > > cheers > Bruce > > > > On Mon, 3 Oct 2011, Gergely Orsi wrote: > > Dear Freesurfers!! >> >> I've encountered two strange segmentation "errors", if they are errors at >> all. >> >> >> >> Please see the attached fs.png: >> >> You can see that there are excess pial tissues on the superior part of the >> brain. The pial surface is >> defined correctly and the excess pial tissue is outside the red line yet >> it >> is coloured pink. My question, is : >> >> Does this have any impact on the results? >> >> >> The second is related to the hippocampus. >> >> Please see the attached fs2.png: >> >> The pial surface around the hippocampus looks a bit weird. >> It actually discards 1/3 of the hippocampus (it is outside the red line). >> >> Do you have any suggestions regarding the two problems. >> >> I'm using FS 4.5 on several 64bit linux distributions. >> >> >> -- >> Gergely Orsi >> biologist - research associate >> Diagnostic Center of Pécs >> H-7623 Pécs, Rét str. 2. >> Tel.: 0036-70-3174676 >> E-mail: gergo.o...@gmail.com >> >> >> > > 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. > -- Gergely Orsi biologist - research associate Diagnostic Center of Pécs H-7623 Pécs, Rét str. 2. Tel.: 0036-70-3174676 E-mail: gergo.o...@gmail.com
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