Hi Venkat,<div><br></div><div>I'm not sure why you want to reject >95 percentile pixels because these pixels are the best representation of the CST (highest probability). Isn't it more reasonable to use the probability threshold like >0.2?</div>
<div><br></div><div>When we do FA calculation, FA of each pixel is weighted by probability. So high probability pixels have more weight. If you don't want it, you can convert the probability map to binary (1/0) by applying a threshold using RoiEditor.</div>
<div><br></div><div>RoiEditor can also allows to apply a cut-off value for FA measurement. In this case, you can, for example, mask-out all pixels with probability <0.2, and then perform probability-weighted FA measurement for those pixels with >=0.2.</div>
<div><br></div><div>Susumu <br><br><div class="gmail_quote">On Wed, Sep 22, 2010 at 11:18 AM, Rajagopalan, Venkateswaran <span dir="ltr"><<a href="mailto:rajagov2@ccf.org">rajagov2@ccf.org</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div>
<br>
<p><font size="2">Dear All,<br>
<br>
I am using CST probability atlas for some calculations (i.e. measuring FA values along CST), since the CST atlas includes probability values ranging from 0 to 1, I want to exclude very low probability values like 0.00002 I tried using Percentile ( since It will not raise concerns when I write an article say I want to retain say between 5% and 95%) however since many voxels have very low probability values this is not working good in the sense for 95 percentile my probability value comes to 0.1745 however the probability values range from 0.0 to 0.578 so all the higher probability values above 0.1745 will get rejected. Any suggestions will be of great help.<br>
<br>
Thanks<br>
<br>
Venkat</font>
</p>
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