<div dir="ltr">Hi Simon,<div><br></div><div>First of all, I regret not being able to going to ICCR, otherwise I could really thank you for your work in RTK. It has really helped me a lot in my research! Fortunately a few of my colleagues got a chance to talk to you (Ricky and John, if you remember). Hopefully I'll see you this year in AAPM!!</div>
<div><br></div><div style>So today I want to ask you about two things.</div><div style><br></div><div style>1. Failed reconstruction (due to maximum angular gap too big?)</div><div style>I noticed that occasionally RTK gives reconstruction that looks like this.</div>
<div style><img src="cid:ii_13ea6ce914b38a38" alt="¤º¸m¹Ï¤ù 1"><br>In case the picture is not sent through, the image has a big angular region where the intensity is essentially zero when viewed axially. This happens when I use displacement binning, and using half-fan data.</div>
<div style>I summarized all my reconstructions and realize this only happens when the "maximum angular gap" of the projections in that bin is greater than 20 degrees. Therefore I assume it's because the half-fan projection on one side not being able to find its corresponding projection image on the other side. I just want to check with you if that's what's happening here.</div>
<div style><br></div><div style>2. There is a paper on direct weighting of uneven angular spaced projections.<br><a href="http://link.springer.com/chapter/10.1007%2F978-3-642-33415-3_23">http://link.springer.com/chapter/10.1007%2F978-3-642-33415-3_23</a><br>
I think the idea is basically lower the weight of closely spaced projections.<br>Is this already implemented in RTK?</div><div style><br></div><div style>Thanks Simon !! :)</div><div style><br></div><div style>Cheers,</div>
<div style>Andy</div></div>