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<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Dear Gate users,</span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB"> </span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">First of all, I hope that everything is ok for you and your relatives regarding the current situation.</span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB"> </span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">I’m trying to simulate a PET detector module comprised of pixelated LYSO crystals that in real life are optically isolated through a Lumirror reflector tape.</span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">According to the GATE users guide there’re two models available in GATE for optical surface definition: LUT Davis and UNIFIED. </span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<ul style="margin-top:0cm" type="disc">
<li class="MsoNormal" style="color:black;mso-list:l1 level1 lfo1"><span style="mso-fareast-language:EN-GB">LUT Davis is not a general model and, unfortunately, it does not include the Lumirror surface definition<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l1 level1 lfo1"><span style="mso-fareast-language:EN-GB">UNIFIED requires the definition of several optical properties that are not always easy to obtain or measure (which is my case right now)<o:p></o:p></span></li></ul>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB"> </span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Also, it’s worth to say that in GEANT4 (G4RealSurface.2.1.1) there is another LUT, called Reflectance LUT, (from Janecek and Moses) in which more optical surfaces are defined, and which
includes the Lumirror surface.</span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Right now I’m using GATE v8.2, which is compiled with the G4RealSurface.2.1.1, so for me seemed logical to think that the Reflectance LUT should also work with GATE. Though, when I checked
the information stored in these data files, I discovered that they are all filled with zeros!</span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB"> </span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Based on all the above I have the next question:</span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoNormal" style="color:black;mso-list:l0 level1 lfo2"><span style="mso-fareast-language:EN-GB">Is it correct to suppose that GATE should run using the Reflectance LUT? If the answer is yes, why all these data files are filled with zeros?<o:p></o:p></span></li><li class="MsoNormal" style="color:black;mso-list:l0 level1 lfo2"><span style="mso-fareast-language:EN-GB">If anyone has previously simulated the Lumirror reflector tape with GATE, using the UNIFIED model, would that person be so gently to help me?<o:p></o:p></span></li></ol>
<p class="MsoNormal"><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"> <o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB"> </span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Regards,</span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB">Francisco </span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:black;mso-fareast-language:EN-GB"> </span><span style="font-size:11.0pt;color:black;mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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