<div dir="ltr"><div>Hi Julia,</div><div>The artifact on the first image is not obvious to me. Can you clarify which artifact is visible on the first image but not on the second?</div><div>In the second image, is the gap exactly at the center of the image? If yes, I don't see a better solution than interpolating between adjacent pixels.</div><div>Simon<br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Mon, Dec 7, 2020 at 6:11 AM Julia Semyakishkina <<a href="mailto:prekrasnaya1985@gmail.com">prekrasnaya1985@gmail.com</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 dir="ltr">Hi!<br>I have a slightly non-typical task. I've got a detector with a vertical gap that is not equal to pixel, so if I just insert interpolated pixel(s) to projection then corresponding geometry artifacts appear. <a href="https://i.imgur.com/1gwW1vx.png" target="_blank">https://i.imgur.com/1gwW1vx.png</a><br><br>In order to take full account of the gap I'm trying to reconstruct my volume twice. So there are two sets of projections on opposite sides of the gap. I passed simple steps:<br>- firstly reconstruct volume for the left side with correct offset that takes into account the gap;<br>- reconstruct volume for the right side with also correct offset and initial volume from previous reconstruction;<br><br>The volume obtained by this sequence does not suffer from geometry artifacts! However, there is a bright point in the center of the volume and the lines that come out of it. <a href="https://imgur.com/nUJ1IW5" target="_blank">https://imgur.com/nUJ1IW5</a>. Obviously, it's related to projection's edge, just like a fov circle in usual reconstruction. Is there any way to get rid of it ?</div>
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