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Well, if it's just that, you should not worry about it : you cannot
perfectly center your object, even if you try. And most objects
(e.g. patients) do not even have a "center". So it does not make
sense to struggle to have the center of the object perfectly match
the isocenter of the acquisition device. <br>
<br>
You can either live with that (it is perfectly fine for most
applications), or try one of these things:<br>
- If you can re-do the acquisition, you should try to have your
object's center <u>roughly</u> match the system's isocenter,
because that's where you will have the least artifacts<br>
- Reconstruct your object as it is (it will work fine, unless there
are other problems), but select the origin and size of your
reconstructed volume carefully to have your object's center roughly
at the center of your reconstructed volume.<br>
<br>
If you are not familiar with the exact definition of "origin",
"spacing" and "size" of an itk::image, read section 4.1.4 of the ITK
software guide (<a class="moz-txt-link-freetext" href="https://itk.org/ItkSoftwareGuide.pdf">https://itk.org/ItkSoftwareGuide.pdf</a>). This is both
clear, short, and something extremely important to understand.<br>
<br>
I hope it helps,<br>
Cyril<br>
<br>
<br>
<br>
<div class="moz-cite-prefix">On 05/17/2016 01:07 PM, AMJAD N wrote:<br>
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cite="mid:CAHq1iu=3gUMNRe6sw0WRfDnURv+T_ZCNbQ8o9qPbX7hCfGHODA@mail.gmail.com"
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<div dir="ltr">Hello,
<div><br>
</div>
<div>As my previous thread caused some confusion, I am attaching
an image showing the same in detail.</div>
<div><br>
</div>
<div>As you can see my object center is not aligned with
isocenter line. Besides it is offset by DX and DY values. In
my case you can see the object center as red dot.</div>
<div><br>
</div>
<div>Is there any method in RTK to nullify this offset effect? </div>
<div>Will the rotation of turntable affect the reconstruction
due to this offset?</div>
</div>
<br>
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<br>
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