Thanks for your kind explanation.<div><br></div><div>-SC</div><div><br><div class="gmail_quote">On Wed, Sep 9, 2009 at 3:22 PM, susumu mori <span dir="ltr"><<a href="mailto:susumu@mri.jhu.edu">susumu@mri.jhu.edu</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">If you have two repeated sets of DTI, yu can easily see the degree of<br>
motion by showing substraction images. When AIR is working, you can<br>
see that the subtraction images become just noises. The subtraction<br>
images can be created by the "mean, STD" button.<br>
<br>
The threshold for AIR is empirical. When it's too low, AIR trys to<br>
match noises and motion may not be corrected. When it's too high, the<br>
brains are not well defined and the results deteriorates. In between<br>
these is a range of values AIR works. You have to figure it out<br>
although once you find it you can keep using the same value for other<br>
data from the same scanner.<br>
<div><div></div><div class="h5"><br>
On 9/9/09, [Seongjin] <<a href="mailto:choisj70@gmail.com">choisj70@gmail.com</a>> wrote:<br>
> Dear all,<br>
><br>
> I heard of that empirical noise level is 40 for AIR in DTI Studio and AIR<br>
> is<br>
> sensitive to the noise level.What kind of differences we should know about<br>
> AIR between using higher noise level and lower noise level?<br>
><br>
> -SC<br>
><br>
<br>
</div></div><font color="#888888">--<br>
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