It depends on how you use this tool. For example, after you start tensor calculation, you get an initial "DTI Map Option" window, in which you can find two checkboxes at the lower left corner saying "create ,,,,,". If you proceed to "standard linear fitting", then you should get one row of theory image and another row of error (subtracted) images.<div>
<br></div><div>In this window, if you choose to use "pixel rejection", instead of "standard linear fitting", you get 3 options in "Verify the results" section. Here we recommend to use "binary mask" instead of "error map". If you choose "binary mask", the bottom row is not error maps, but showing which pixels were rejected due to large errors. </div>
<div><br></div><div>If you case, I suspect your images did not contain obvious outliers and therefore the bottom row images are mostly blank.<br><br><div class="gmail_quote">2010/10/31 hanaie <span dir="ltr"><<a href="mailto:dc02hana@m6.gyao.ne.jp">dc02hana@m6.gyao.ne.jp</a>></span><br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex;">
<div lang="JA" link="blue" vlink="purple">
<div>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">Hi,</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">To evaluate the
quality of DTI data, I used “theory Image Tool”.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">Because I have
only 1 data set.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">After using
“theory Image Tool” , I checked images. But these image looks like strange.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">Issue is third
row.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">In these images,
first row is scan#1 and second row is theory image ,third row is </span><span style="font-size:10.0pt">Δ</span><span lang="EN-US" style="font-size:10.0pt">(theory,scan#1).</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">In my image ,
third row looks like almost black with a little bit white point.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">I read the paper
titled “How should we evaluate the quality of our DTI data?”</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">In that paper,
third row looks like grey.</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">Why does my image
looks like almost black?</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">Is wrong gradient
table responsibility for it?</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"><img width="348" height="188" alt="無題1.5.jpg"></span><span lang="EN-US" style="font-size:10.0pt"></span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">Thanks,</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt">Ryuzo</span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
<p class="MsoNormal"><span lang="EN-US" style="font-size:10.0pt"> </span></p>
</div>
</div>
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