[Mristudio-users] Noise level setting for AIR in DTI Studio

[Seongjin]

Thanks for your kind explanation.
-SC

On Wed, Sep 9, 2009 at 3:22 PM, susumu mori <susumu at mri.jhu.edu> wrote:

> If you have two repeated sets of DTI, yu can easily see the degree of
> motion by showing substraction images. When AIR is working, you can
> see that the subtraction images become just noises. The subtraction
> images can be created by the "mean, STD" button.
>
> The threshold for AIR is empirical. When it's too low, AIR trys to
> match noises and motion may not be corrected. When it's too high, the
> brains are not well defined and the results deteriorates. In between
> these is a range of values AIR works. You have to figure it out
> although once you find it you can keep using the same value for other
> data from the same scanner.
>
> On 9/9/09, [Seongjin] <choisj70 at gmail.com> wrote:
> > Dear all,
> >
> > I heard of that empirical noise level is 40 for AIR in DTI Studio and AIR
> > is
> > sensitive to the noise level.What kind of differences we should know
> about
> > AIR between using higher noise level and lower noise level?
> >
> > -SC
> >
>
> --
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