<br><br>Hi <span lang="EN-GB">Kana,<br><br>Using the ResampleImageFilter here <br>seems to be an overkill.<br></span><br>There are more efficient ways of finding<br>values in the neighborhood of a point.<br><br><br>Is your tubular structure a straight one ?<br>
<br>Could you please post a screenshot<br>of your image to a public web site ?<br><br><br> Please let us know,<br><br><br> Thanks<br><br><br> Luis<br><br><br>------------------------------------------------------------<br>
<div class="gmail_quote">On Fri, Jun 18, 2010 at 4:44 AM, Arunachalam Kana <span dir="ltr"><<a href="mailto:Kana.Arunachalam@fh-wels.at">Kana.Arunachalam@fh-wels.at</a>></span> wrote:<br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div link="blue" vlink="purple" lang="DE-AT">
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<p class="MsoNormal">Hi Users,</p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span lang="EN-GB">My task :</span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p>
<p class="MsoNormal"><span lang="EN-GB">I have a tube structure and i calculate the
hessian matrix and do eigen analysis.</span></p>
<p class="MsoNormal"><span lang="EN-GB">For example: </span></p>
<p class="MsoNormal"><span lang="EN-GB">point P = [7,7,7]</span></p>
<p class="MsoNormal"><span lang="EN-GB">Eigen values: EValueMatrix = [-634, -1389,
-9] (approximate values)</span></p>
<p class="MsoNormal"><span lang="EN-GB">Eigen vector: EVectorMatrix = 0.99, 0.13,
0</span></p>
<p class="MsoNormal"><span lang="EN-GB"> 0.13,
0.99, 0</span></p>
<p class="MsoNormal"><span lang="EN-GB"> 0.11,
0.11, 0.78 </span></p>
<p class="MsoNormal"><span lang="EN-GB">From above i say: </span></p>
<p><span lang="EN-GB"><span>1.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><span lang="EN-GB">Vector corresponding to EValue
= -9 which is EVector = (0.11, 0.11, 0.78) show the direction of</span></p>
<p class="MsoNormal"><span lang="EN-GB">The tube structure. </span></p>
<p><span lang="EN-GB"><span>2.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><span lang="EN-GB">Vector corresponding to EValue
= -634 and -1389 which are EVector = (0.99, 0.13, 0) and (0.13, 0.99, 0)</span></p>
<p class="MsoNormal"><span lang="EN-GB">respectively represent the plane
perpendicular to the tube direction. (I name the plane as Plane1)</span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p>
<p class="MsoNormal"><span lang="EN-GB">Goal : I want to extract the neighbour points
and their gray values of point P and lie on plane Plane1. </span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p>
<p class="MsoNormal"><span lang="EN-GB">I thought about the below pipeline:</span></p>
<p class="MsoNormal"><span lang="EN-GB">Step 1: Read image </span></p>
<p class="MsoNormal"><span lang="EN-GB">Step 2: Rotate image using EVector = (0.11,
0.11, 0.78) (using itkResampleImageFilter, rotation transform, trilinear
interpolator)</span></p>
<p class="MsoNormal"><span lang="EN-GB">Step 3: Rotate image using EVector = (0.99,
0.13, 0) (using itkResampleImageFilter, rotation transform, trilinear
interpolator)</span></p>
<p class="MsoNormal"><span lang="EN-GB">Step 4: Rotate image using EVector = (0.13,
0.99, 0) (using itkResampleImageFilter, rotation transform, trilinear
interpolator)</span></p>
<p class="MsoNormal"><span lang="EN-GB">Step 5: In the output image from step 4 use
neighbourhood iterator to obtain the neighbour points.</span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p>
<p class="MsoNormal"><span lang="EN-GB">What i need from ITK users:</span></p>
<p><span lang="EN-GB"><span>1.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><span lang="EN-GB">I request the itk community to
check whether above pipeline is correct to achieve my goal.</span></p>
<p><span lang="EN-GB"><span>2.<span style="font-family: "Times New Roman"; font-style: normal; font-variant: normal; font-weight: normal; font-size: 7pt; line-height: normal; font-size-adjust: none; font-stretch: normal;">
</span></span></span><span lang="EN-GB">If you have any other pipeline
in mind it would be useful for me.</span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p>
<p class="MsoNormal"><span lang="EN-GB">Thank you in advance.</span></p>
<p class="MsoNormal"><span lang="EN-GB"> </span></p>
<p class="MsoNormal"><span lang="EN-GB">Regards,</span></p>
<p class="MsoNormal"><span lang="EN-GB">Kana Aru</span>nachalam Kannappan</p>
<p class="MsoNormal">Research Associate</p>
<p class="MsoNormal">FH OÖ Forschungs & Entwicklungs GmbH</p>
<p class="MsoNormal">Stelzhamer Strasse 23,</p>
<p class="MsoNormal">4600 Wels,</p>
<p class="MsoNormal">Austria.</p>
<p class="MsoNormal">Phone: +43 (0)7242 72811 -4420</p>
<p class="MsoNormal"><a href="mailto:kana.arunachalam@fh-wels.at" target="_blank">kana.arunachalam@fh-wels.at</a></p>
<p class="MsoNormal"><a href="http://www.fh-ooe.at" target="_blank">www.fh-ooe.at</a>; <a href="http://www.3dct.at" target="_blank">www.3dct.at</a></p>
<p class="MsoNormal"> </p>
</div>
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