Hi Satra

this seems vanishingly unlikely to me, particularly with partial volume correction. Have you visualize some of the subjects that have the same structure volume?

Bruce

On Mon, 8 Jul 2013, Satrajit Ghosh wrote:

a quick update. the following fiddle will show the number of subjects that
have an identical the same Right Amygdala volume. It simply plots a
histogram of the counts per volume (scroll to the bottom of the result
window).
http://fiddle.jshell.net/satra/MXKY6/6/

cheers,

satra


On Mon, Jul 8, 2013 at 1:07 PM, Satrajit Ghosh <satra@mit.edu> wrote:
      hi,

trying to figure out the likelihood of identical subcortical volumes
across individuals. i'm noticing this in some data processed with
FreeSurfer 5.1.0.

just to give some probabilities - these are out of about 963
participants.

and there are several such small clusters of identical numbers - never
exceeding 6 participants i believe.

cheers,

satra
0021003
aseg.stats
http://freesurfer.net/fswiki/terms/Right-Hippocampus
"4142.0"^^<http://www.w3.org/2001/XMLSchema-datatypes#float>
0015035
aseg.stats
http://freesurfer.net/fswiki/terms/Right-Hippocampus
"4142.0"^^<http://www.w3.org/2001/XMLSchema-datatypes#float>
3976121
aseg.stats
http://freesurfer.net/fswiki/terms/Right-Hippocampus
"4142.0"^^<http://www.w3.org/2001/XMLSchema-datatypes#float>
1623716
aseg.stats
http://freesurfer.net/fswiki/terms/Right-Amygdala
"1603.0"^^<http://www.w3.org/2001/XMLSchema-datatypes#float>
0023005
aseg.stats
http://freesurfer.net/fswiki/terms/Right-Amygdala
"1603.0"^^<http://www.w3.org/2001/XMLSchema-datatypes#float>
0023008
aseg.stats
http://freesurfer.net/fswiki/terms/Right-Amygdala
"1603.0"^^<http://www.w3.org/2001/XMLSchema-datatypes#float>
0027025
aseg.stats
http://freesurfer.net/fswiki/terms/Right-Amygdala
"1603.0"^^<http://www.w3.org/2001/XMLSchema-datatypes#float>
1341865
aseg.stats
http://freesurfer.net/fswiki/terms/Right-Amygdala
"1603.0"^^<http://www.w3.org/2001/XMLSchema-datatypes#float>
2947936
aseg.stats
http://freesurfer.net/fswiki/terms/Right-Amygdala
"1603.0"^^<http://www.w3.org/2001/XMLSchema-datatypes#float>

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.