<div dir="ltr">Hi,<br><div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Nov 28, 2016 at 2:00 PM, Triltsch, Nicolas <span dir="ltr"><<a href="mailto:nicolas.triltsch@tum.de" target="_blank">nicolas.triltsch@tum.de</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Hey everyone,<br>
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I have three questions concerning the fixed forced detection actor(ffda):<br>
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1) As output one can generate e.g. primary.mha, compton.mha, rayleigh.mha and total.mha images. In the GATE wiki it states, that primary + compton + rayleigh = total. But if I compare the two images they are different! Why? (total.mha image was flatfield corrected by default; primary, compton and rayleigh weren't, so I used the flatField.mha to correct them before the comparison with total.mha)<br></blockquote><div> I checked and there is a bug in the total filename. However, it does not use the flat field but rather one step was forgotten (accounting for the total number of particles in the simulation). I must admit that I never use that output in practice, hence the bug. This <a href="https://github.com/OpenGATE/Gate/commit/988f886133ee741eeca692df027e7786e025c7bc">fix</a> should correct that.<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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2) For the ffda the source needs to be focused. Why is that necessary?<br></blockquote><div>Because ffda uses <a href="http://openrtk.org/">RTK</a> for deterministic computation and RTK is working for point sources. <br></div><div><br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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3) One output image is called secondary.mha. First, I thought this image would represent secondary scatter events. But in the GATE wiki it says that secondary = compton + rayleigh. Is their a way to obtain a secondary scatter (multiple scatter) image?<br></blockquote><div>It used to be possible but I think we have removed it to "minimize" the number of options. You can try (but I don't guarantee it works) to add a line in the code, e.g. around line 57 of GateFixedForcedDetectionActor.cc:<br>mPerOrderImagesBaseName="order";<br></div><div>It will then create an image of the form "orderRayleigh0004_order02.mha" for the second order of the rayleigh projection number 4.<br></div><div>Simon<br></div><div><br> <br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
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I would appreciate any help!<br>
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Nico<br>
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