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Hello Peter,</div>
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I will address your question paragraph by paragraph to make it more clear: </div>
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<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;">"I
had been following this thread and was able to use the patch to get coincidences using a cylindricalPET system that looked just as they should."</span></div>
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<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-size: 14.6667px;">I am glad you successfully obtained coincidences, but I guess you meant "using a PETscanner", because a cylindricalPET system, according to the docs,
only supports ring and cubicarray repeaters. The precise object of this thread was that no coincidences were obtained when a generic repeater was used, and a generic repeater can only be used with the PETscanner template.</span></div>
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<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-size: 14.6667px;">"<span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;">So
my problem is not particularly GATE-driven, but I was attempting to reconstruct an image using Castor and found the results to be rather odd. First found that I had to create the .geom file by hand, gateMacToGeom was not recognizing the generic repeater.</span>"</span></div>
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<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-size: 14.6667px;">This is no surprise, as it is stated in the pages 48-50 of the v3 doc of CASToR: "The castor-GATEMacToGeom is a very basic utility to generate a geom
file from a GATE[7] mac file defining a cylindricalPET, ecat, or SPECThead geometry." We can imagine that it would be very difficult to generalize this utility to systems that are described with other, less restrictive scanner templates.</span></div>
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<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-size: 14.6667px;">This point is important: I think it is easier, when using non-standard geometries, to get the exact positions of all the crystals in your scanner with
a little trick that I found, and that I already described here: <a href="http://lists.opengatecollaboration.org/pipermail/gate-users/2020-March/011452.html" id="LPlnk240499" style="">http://lists.opengatecollaboration.org/pipermail/gate-users/2020-March/011452.html</a> </span><span style="font-size: 14.6667px;">Once
you have parsed the text file describing exactly the geometry of your scanner, you have to format the positions of your crystals in a lookup table format (LUT, p.20+ of v3 CASToR doc) that can be used to reconstruct your data.</span></div>
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<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-size: 14.6667px;">"</span><span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; font-size: 14.6667px; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;">But
then it seemed like it was placing my particle sources in the wrong place, though they were definitely present.</span><span style="font-size: 14.6667px;">"</span><br>
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<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-size: 14.6667px;">Without more context and code, it is difficult to tell what could have gone wrong between your simulation, your description of your scanner geometry
by hand and the reconstruction itself.</span></div>
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<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-size: 14.6667px;"><span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;">"I
was curious If anyone had attempted image reconstruction in a simulation with a generic repeater and seen similar problems?"</span></span></div>
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-size: 14.6667px;"><span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;"><br>
</span></span></div>
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-size: 14.6667px;"><span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;">But
do not despair, as I (and probably others) already have successfully reconstructed images with CASToR from a simulation that was using a generic repeater with the PETscanner template. We just need a little more info about your case to help you.</span></span></div>
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</span></span></div>
<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-size: 14.6667px;"><span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;">Cheers,</span></span></div>
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<div style="color: rgb(0, 0, 0); background-color: rgb(255, 255, 255);"><span style="font-size: 14.6667px;"><span style="font-family: "Segoe UI", "Segoe UI Web (West European)", "Segoe UI", -apple-system, system-ui, Roboto, "Helvetica Neue", sans-serif; color: rgb(0, 0, 0); background-color: rgb(255, 255, 255); display: inline !important;">Étienne</span></span></div>
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