<div dir="ltr"><div>Hi,</div><div>FieldOfViewImageFilter only masks out what is not in the FOV. Is this masking failing or is the problem the white artefacts in the FOV?</div><div>In the latter case, the only heuristic truncation is that of <a href="https://doi.org/10.1118/1.598855">Ohnesorge et al</a>, which can be set like this</div><div><a href="https://github.com/RTKConsortium/RTK/blob/master/applications/rtkfdk/rtkfdk.cxx#L145C3-L145C46">https://github.com/RTKConsortium/RTK/blob/master/applications/rtkfdk/rtkfdk.cxx#L145C3-L145C46</a></div><div>where 0 means no correction, 1 means padding with the same size as the input and values between 0 and 1 are a fraction of the size.</div><div>Otherwise, you may want to consider iterative reconstruction but it seems that you have an interior problem which cannot be solved. See <a href="https://doi.org/10.1109/MSP.2010.936743">this article</a> for a review of the literature on this topic.</div><div>Simon</div><div><br></div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Wed, Feb 19, 2025 at 2:08 AM 王治阵 <<a href="mailto:2023200830@mail.buct.edu.cn">2023200830@mail.buct.edu.cn</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><p style="font-size:14px">
<span style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:16px;background-color:rgb(255,255,255)">Hi,</span>
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<span style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:16px;background-color:rgb(255,255,255)">Recently, I was using FDK algorithm for CBCT, but when I used <span style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:16px;text-indent:28px;background-color:rgb(255,255,255)"> </span><span style="text-indent:28px;white-space:break-spaces;color:rgb(31,35,40);font-family:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;font-size:11.9px;background-color:rgba(129,139,152,0.12)">FieldOfViewImageFilter()</span>, there were some truncation artifacts at the beginning and end of reconstruction results, which may be caused by insufficient data collection. Then, is there any algorithm in ITK and RTK that can eliminate truncation artifacts and restore the original field of view with some methods?<img src="cid:ii_1951e5b89e82c91aec1" alt=""><img src="cid:ii_1951e5b89e82d7326d2" alt=""></span>
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<span style="color:rgb(34,34,34);font-family:Arial,sans-serif;font-size:16px;background-color:rgb(255,255,255)"><span>The small field of view is the truncation artifact, and the large field of view is the original field of view.</span><br>
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