The brain masking by a simple threshold does not guarantee suppression of all extra-cranial signals. It is very common that a threshold level that doesn't mask any brain tissues leave some pixels outside the brain.<div>
If you want a very clean brain extraction, you can try region growing or skull-strip tools in RoiEditor or other software. </div><div><br><div class="gmail_quote">On Mon, Nov 29, 2010 at 10:42 AM, Chunxiao Zhou <span dir="ltr"><<a href="mailto:czhou4@gmail.com">czhou4@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;"><div>Dear DTIstudio experts,</div>
<div> </div>
<div>When I move my cursor over the DWIs, I found the intensity values of most brain region are large. And background intensities range from 0-30. But a few pixels have intensity range from 3-10. I am wondering if I still can set the background noise level to 10, or even higher? Does the background noise level should guarantee to keep whole brain or allow exclusion of a few pixels within brain? </div>
<div> </div>
<div>Thank you!</div>
<div> </div>
<div>Chunxiao(Andrew)</div>
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