That explains it then. Prior to FS v4.5, various binaries used a different random seed at run-time, which would result in the (presumably subtle) differences that you noticed.

See http://surfer.nmr.mgh.harvard.edu/fswiki/ReleaseNotes

cheers, -MH

On Tue, 2012-02-21 at 11:12 -0500, Alan Francis wrote:

Hi Michael:

We are running 4.3 for this particular study (for continuity) although we have 5.1 for other studies. We ran each of them from scratch each time.

thanks,

Alan

On Tue, Feb 21, 2012 at 11:09 AM, Michael Harms mharms@conte.wustl.edu wrote:

    Hi Alan,
    What version of FS are you using?  And did you run from
    scratch each
    time on the original inputs? (Or did you run it on top of the
    previously
    processed version?)

    cheers,
    -MH

    On Tue, 2012-02-21 at 11:04 -0500, Alan Francis wrote:
    > Dear Bruce:
    >
    > I ran 3 brains twice and checked the ASEG and APARC values
    for each of
    > these. It turns out that the ASEG values are exactly the
    same -  both
    > times, while the APARC values differ. Could you please
    explain why
    > this happens.
    >
    > thanks so much ~
    >
    > Alan
    >
    > Beth Israel Deaconess Medical Center

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