<div dir="ltr"><div>Hi Vincent,</div><div>This sounds like a typical geometry problem. It's hard to guess what could be the problem without data. Is it a system for which you're able to reconstruct in the opposite direction?</div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Aug 27, 2020 at 2:17 PM Vincent Libertiaux <<a href="mailto:vl@xris.eu">vl@xris.eu</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">Dear RTK users,<br>
<br>
I am trying to reconstruct a volume using the opposite rotation <br>
direction; I basically defined my rotation angle to be -360 degrees and <br>
my initial angle to be 359.6 (I have 900 projections).<br>
<br>
The results present artefacts, mostly important blurs compared to the <br>
"original" reconstruction. To be sure I was not misinterpreting the way <br>
rtk deals with the geometry, I performed the same reconstruction with <br>
the "direct" rotation direction (from 0 to 359.6) but reordering my <br>
projections instead, which yields in the same blurry results.<br>
<br>
I feel I am missing some basic understanding of what is happening, any <br>
help you can provide would be much appreciated !<br>
<br>
Best regards,<br>
<br>
Vincent<br>
<br>
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