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Dear Gate users
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<div class="">I’m facing a problem using the cold source macro in Gate 7.2, I can only have one forbid region where I want to have two, and I don’t understand why.</div>
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<div class="">What I’m trying to do is to mimic a portion of a NEMA NU4 phantom like in the picture below. What I try to do this is to generate a cylindrical source (named F18_Source_BotCylinder) filled with radioactive material, and then define two separated
volumes, the smaller cylinders, as water and air, and mark them as a forbid region in the original source. The commands that I’m using are</div>
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<div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto;">/gate/source/F18_Source_BotCylinder/gps/Forbid BotCylinderHole1</div>
<div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto;">/gate/source/F18_Source_BotCylinder/gps/Forbid BotCylinderHole2</div>
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<div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto;">The GATE output is this </div>
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<div>Confirming activity forbidden in volume 'BotCylinderHole1_phys'...</div>
<div> Activity forbidden in volume 'BotCylinderHole1_phys' confirmed</div>
<div>Confirming activity forbidden in volume 'BotCylinderHole2_phys'…</div>
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<div> Activity forbidden in volume 'BotCylinderHole2_phys’ confirmed</div>
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<div>But then I don’t know if it assumes the command for the two volumes or if it overrides the previous command.</div>
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<div style="orphans: auto; text-align: start; text-indent: 0px; widows: auto;">The image that I get after image reconstruction with matlab is showing only one of the holes, only the last one in the command above. Is it suporte to happen with the Forbid command,
we can only forbid a unique volume or should I be able to forbid as many regions as I want?</div>
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Thank ou very much</div>
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Pedro CorreiaPhD Student in Applied and Engineering Physics</div>
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Physics Department</div>
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University of Aveiro</div>
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Campus Universitario de Santiago, </div>
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3810-193 Aveiro, Portugal</div>
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<a href="mailto:pmcorreia@ua.pt" class="">pmcorreia@ua.pt</a></div>
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