<div dir="ltr"><div><div><div>Hi Robert,<br></div>I'm not sure I understand what your tomosynthesis does. But what I would do is fix all geometric parameters to constant values, including the angles (gantry, inplane, outofplane), except SourceOffsetX, SourceOffsetY, ProjectionOffsetsX, ProjectionOffsetsY. In any case, I would not modify the object size and positions, this is a given in practice. If you want to cover your object, just use a larger detector.<br></div>Good luck,<br></div>Simon<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Tue, Mar 3, 2015 at 3:56 PM, "Robert Calließ" <span dir="ltr"><<a href="mailto:Robert.Calliess@gmx.de" target="_blank">Robert.Calliess@gmx.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div><div style="font-family:Verdana;font-size:12.0px"><div>Hello,</div>
<div>I know that RTK's primary use is the field of a circular trajectory. But if one would</div>
<div>use the the RTK for tomosynthesis the first choice's algorithm would be the</div>
<div>S-ART.</div>
<div> </div>
<div>Following situation. The Focus is fixed. The object only moves in the xy plane and also the</div>
<div>detectors, for instance flat panel detectors. So that a virtually line would always goes from</div>
<div>the focus through the object center and ends in the detector's center.</div>
<div>I wonder how to handle the different geometry settings for this kind of reconstruction.</div>
<div>What I mean is, that with a circular trajector the parameters FOD, FDD and ODD always</div>
<div>remain the same because we are rotationg around an axis. But for the case of planar</div>
<div>tomosynthesis the FOD, FDD will be different from the orthogonal view.</div>
<div>Usually we calculate the physical size of the object based on the FOD and FDD to get sure</div>
<div>that the object fits within the cone.</div>
<div>But now for the case of a planar tomosynthesis do one need to recalculate the object size</div>
<div>so that the object fits into the current cone beam or do one work with the object size calculated</div>
<div>for the center view (orthogonal view, where the original FOD, FDD are given) ?</div>
<div> </div>
<div>I think if I would resize the object for every viewing position this would change a lot for the</div>
<div>reconstruction result as I also change the "ray paths".</div>
<div> </div>
<div>Does anyone has experiences with this kind of reconstruction ?</div>
<div> </div>
<div> </div>
<div>best regards,</div>
<div>Robert C.</div>
<div> </div>
<div> </div></div></div>
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