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Dear all,</div>
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I’m having trouble understanding the digitizer modules for SPECT/gamma cameras. According to the SPECT examples I’ve found only the adder, readout, blurring, spblurring and thresholds modules are used. </div>
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But modules such as lightyield, transfer efficiency, quantum efficiency, crystal blurring are not yet taken into account in all of those examples.</div>
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Are the former already covered by the definition of the crystal material (in my case, NaI(Tl) crystal) and blurring (in my case 10% @ 140keV)?</div>
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Or do I need to define them additionally to the ones in my code to get realistic images?</div>
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Also I don’t really understand based on the documentation how to apply the digitizer modules which are not part of my code yet, because it always throws a segmentation violations error.</div>
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Based on my code the pictures look good qualitatively, but the count rates don’t match with real measurements.</div>
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Would be glad to get some feedback.</div>
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Cheers,</div>
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Korbinian</div>
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Code:</div>
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###CAMERA model</div>
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/<i class="">gate</i>/<i class="">world</i>/<i class="">daughters</i>/<i class="">name SPECThead</i></div>
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/<i class="">gate</i>/<i class="">world</i>/<i class="">daughters</i>/<i class="">insert box</i></div>
<div style="margin: 0px; font-stretch: normal; font-size: 13px; line-height: normal; font-family: "Helvetica Neue";" class="">
/<i class="">gate</i>/<i class="">SPECThead</i>/<i class="">geometry</i>/<i class="">setXLength
</i>300 <i class="">mm </i># </div>
<div style="margin: 0px; font-stretch: normal; font-size: 13px; line-height: normal; font-family: "Helvetica Neue";" class="">
/<i class="">gate</i>/<i class="">SPECThead</i>/<i class="">geometry</i>/<i class="">setYLength
</i>76.5 <i class="">mm</i></div>
<div style="margin: 0px; font-stretch: normal; font-size: 13px; line-height: normal; font-family: "Helvetica Neue";" class="">
/<i class="">gate</i>/<i class="">SPECThead</i>/<i class="">geometry</i>/<i class="">setZLength
</i>300 <i class="">mm </i># </div>
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/<i class="">gate</i>/<i class="">SPECThead</i>/<i class="">placement</i>/<i class="">setTranslation
</i>0 -20 0 <i class="">mm</i></div>
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/<i class="">gate</i>/<i class="">SPECThead</i>/<i class="">setMaterial Air</i></div>
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/<i class="">gate</i>/<i class="">SPECThead</i>/<i class="">daughters</i>/<i class="">name crystal</i></div>
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/<i class="">gate</i>/<i class="">SPECThead</i>/<i class="">daughters</i>/<i class="">insert box</i></div>
<div style="margin: 0px; font-stretch: normal; font-size: 13px; line-height: normal; font-family: "Helvetica Neue";" class="">
/<i class="">gate</i>/<i class="">crystal</i>/<i class="">geometry</i>/<i class="">setXLength
</i>230 <i class="">mm</i></div>
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/<i class="">gate</i>/<i class="">crystal</i>/<i class="">geometry</i>/<i class="">setYLength
</i>6.5 <i class="">mm</i></div>
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/<i class="">gate</i>/<i class="">crystal</i>/<i class="">geometry</i>/<i class="">setZLength
</i>210 <i class="">mm</i></div>
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/<i class="">gate</i>/<i class="">crystal</i>/<i class="">placement</i>/<i class="">setTranslation
</i>0. -6. 0. <i class="">mm</i></div>
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/<i class="">gate</i>/<i class="">crystal</i>/<i class="">setMaterial NaITl</i></div>
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/<i class="">control</i>/<i class="">execute mac</i>/<i class="">Collimator</i>/<i class="">collimator_for_</i>{<i class="">isotope</i>}/<i class="">hexagon_clinicV2</i>.mac</div>
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###DIGITIZER</div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">insert adder</i></div>
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<i class=""></i><br class="">
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">insert readout</i></div>
<div style="margin: 0px; font-stretch: normal; line-height: normal;" class=""><font face="Helvetica Neue" size="2" class="">#/</font><i style="font-family: "Helvetica Neue"; font-size: 13px;" class="">gate</i><font face="Helvetica Neue" size="2" class="">/</font><i style="font-family: "Helvetica Neue"; font-size: 13px;" class="">digitizer</i><font face="Helvetica Neue" size="2" class="">/</font><i style="font-family: "Helvetica Neue"; font-size: 13px;" class="">Singles</i><font face="Helvetica Neue" size="2" class="">/</font><i style="font-family: "Helvetica Neue"; font-size: 13px;" class="">readout</i><font face="Helvetica Neue" size="2" class="">/</font><i style="font-family: "Helvetica Neue"; font-size: 13px;" class="">setPolicy
TakeEnergyCentroid #this does not work somehow, but </i><font face="Helvetica Neue" size="2" class=""><i class="">I</i></font><i style="font-family: "Helvetica Neue"; font-size: 13px;" class=""> thought might be better </i><font face="Helvetica Neue" size="2" class=""><i class="">bcs
my camera uses PMTs</i></font></div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">readout</i>/<i class="">setDepth
</i>1</div>
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<i class=""></i><br class="">
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">insert blurring</i></div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">blurring</i>/<i class="">setLaw inverseSquare</i></div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">blurring</i>/<i class="">inverseSquare</i>/<i class="">setResolution
</i>0.099</div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">blurring</i>/<i class="">inverseSquare</i>/<i class="">setEnergyOfReference
</i>140.5 <i class="">keV</i></div>
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<i class=""></i><br class="">
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#<i class="">spatialblurring</i></div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">insert spblurring</i></div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">spblurring</i>/<i class="">setSpresolution
</i>3.2 <i class="">mm </i></div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">spblurring</i>/<i class="">verbose
</i>0</div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">insert thresholder</i></div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">thresholder</i>/<i class="">setThreshold
</i>126.45 <i class="">keV</i></div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">insert upholder</i></div>
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/<i class="">gate</i>/<i class="">digitizer</i>/<i class="">Singles</i>/<i class="">upholder</i>/<i class="">setUphold
</i>154.55 <i class="">keV</i></div>
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