Re: [Freesurfer] regarding use-mritotal

2012-12-17 Thread Knut J Bjuland 

Hi,
Talairach.xfm is a text file which contains a transformation matrix. 
Though there is small numerical difference between two transformation 
matrix made using mritotal and the default Talairach registration. The 
process of calculation the ICV may amplify this difference since it used 
the determinate of the transformation matrix to calculate ICV. The 
differences in ICV may depend on how different the numerical values of 
the Talairach transformation matrix are.


Best regrards
Knut J

On 12/14/2012 09:06 PM, Eric Cunningham wrote:

Hi,

this link:
http://surfer.nmr.mgh.harvard.edu/fswiki/TalFailV5.1
discusses a solution to bad talairach.xfm transforms, the 
-use-mritotal flag.


this link:
http://surfer.nmr.mgh.harvard.edu/fswiki/eTIV
mentions that the talairach.xfm is used to calculate the total 
intracranial volume.


is using mritotal likely to result in significantly different 
intracranial volumes even if the talairach.xfm does not appear to be 
very different when viewed?


thanks much,
-eric




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[Freesurfer] regarding use-mritotal

2012-12-14 Thread Eric Cunningham 
Hi,

this link:
http://surfer.nmr.mgh.harvard.edu/fswiki/TalFailV5.1
discusses a solution to bad talairach.xfm transforms, the -use-mritotal
flag.

this link:
http://surfer.nmr.mgh.harvard.edu/fswiki/eTIV
mentions that the talairach.xfm is used to calculate the total intracranial
volume.

is using mritotal likely to result in significantly different intracranial
volumes even if the talairach.xfm does not appear to be very different when
viewed?

thanks much,
-eric
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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.