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just in case it helps, the point were struggles and takes a lot of time is in the DiffusionTensor3DReconstructionImageFilter.&nbsp;<br><div><br>
<p align="center" style="font-family: Tahoma; font-size: 10pt; "><font color="#000000"><img height="2" src="http://graphics.hotmail.com/greypixel.gif" width="100%" vspace="9"></font></p></div><br><br><br><br><div id="SkyDrivePlaceholder" style="font-family: Tahoma; font-size: 10pt; "></div><hr id="stopSpelling" style="font-family: Tahoma; font-size: 10pt; "><font class="Apple-style-span" face="Tahoma" size="2">From: albagarin1986@hotmail.com</font><br><font class="Apple-style-span" face="Tahoma" size="2">To: hans-johnson@uiowa.edu; insight-users@itk.org; mark-scully@uiowa.edu</font><br><font class="Apple-style-span" face="Tahoma" size="2">Date: Fri, 11 Feb 2011 13:37:14 +0000</font><br><font class="Apple-style-span" face="Tahoma" size="2">Subject: Re: [Insight-users] reading a dwi nrrd file</font><br><br>

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<br><font class="Apple-style-span" face="Tahoma" size="2">I do not know what i am doing wrong. First, I read the file with (itk::ImageFileReader&lt;VectorImage&lt;unsigned short, 3&gt;&gt;) and I extract the gradients from the header with itk::MetaDataDictionary and I set as input of the itk::DiffusionTensor3DReconstructionImageFilter the gradients and the output of the reader. These takes 35 minutes. So weird...</font><div style="font-family: Tahoma; font-size: 10pt; ">Could anybody help me?<br><div><p align="center"><font class="ecxApple-style-span" color="#9900FF" face="'Lucida Handwriting', cursive" size="5"><br></font></p>
<p align="center" style="font-family:Tahoma;font-size:10pt"><font color="#000000"><img height="2" src="http://graphics.hotmail.com/greypixel.gif" width="100%" vspace="9"></font></p></div><br><br><br><br><div id="ecxSkyDrivePlaceholder" style="font-family:Tahoma;font-size:10pt"></div><hr id="ecxstopSpelling" style="font-family:Tahoma;font-size:10pt"><font class="ecxApple-style-span" face="Tahoma" size="2">From: hans-johnson@uiowa.edu</font><br><font class="ecxApple-style-span" face="Tahoma" size="2">To: albagarin1986@hotmail.com; insight-users@itk.org; mark-scully@uiowa.edu</font><br><font class="ecxApple-style-span" face="Tahoma" size="2">Subject: Re: [Insight-users] reading a dwi nrrd file</font><br><font class="ecxApple-style-span" face="Tahoma" size="2">Date: Fri, 11 Feb 2011 13:27:17 +0000</font><br><br>






<div style="font-family:Tahoma;font-size:10pt">No. &nbsp;It only should take a few seconds for a 72 gradient direction image (At least on unix).</div>
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<span style="font-weight:bold">From: </span>alba garin &lt;<a href="mailto:albagarin1986@hotmail.com">albagarin1986@hotmail.com</a>&gt;<br>
<span style="font-weight:bold">Date: </span>Fri, 11 Feb 2011 12:11:31 +0000<br>
<span style="font-weight:bold">To: </span>&lt;<a href="mailto:insight-users@itk.org">insight-users@itk.org</a>&gt;<br>
<span style="font-weight:bold">Subject: </span>[Insight-users] reading a dwi nrrd file<br>
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<pre style="line-height:17px;white-space:normal">Hello, itk users!</pre>
<pre style="line-height:17px;white-space:normal">i am reading a dwi nrrd file and it takes 35 minutes (using Visual Studio and ITK) to get the tensor image (Image&lt;DiffusionTensor3D&lt;double&gt;,3&gt;). żis it normal?&nbsp;</pre>
<pre style="line-height:17px;white-space:normal">thanks in advance,</pre>
<pre style="line-height:17px;white-space:normal">Alba</pre>
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