Date: Mon, 20 Jul 2020 15:14:26 +0000
Dear Fluka Experts,
I would like to investigate efficiency of a custom plastic detector for PET. I propagate 200 MeV electron beam through a 10x10x60 cm^3 PMMA phantom and I score all photons coming out of the phantom through the side walls. I would like to filter only the annihilation photons. I believe there are photons with energies of 511 keV that are not from annihilations (bremsstrahlung) and those that are from annihilations but scattered in the phantom and have energy lower than 511 keV. I would like to count all photons which were produced through positron annihilation and simulate the 2D map of annihilation events in my target using the USRBIN card. I used the EMCUT card to set kinetic energy threshold for e+/e- bremsstrahlung, higher than incident electron energy, to obtain 511 keV peak only from annihilations.
[cid:07962fe7-938d-4b06-90fb-6530b2e1ba5d]
However, these photons could eventually produce positrons which could potentially annihilate. Therefore, I believe this is not the right way to do that. My other concern is that I get also prompt gammas from de-excitations of the target nuclei. How can I filter them?
I've been using fluka for dosimetry applications, therefore this topic is very new to me. Eventually, I plan to use the PET tool for more complex simulations but I can't find a tutorial about scoring. I created my detector geometry through the tool but there are no scoring cards inside the created input file. What I would like to obtain is listed on the page 13 of the presenation:
file:///tmp/mozilla_karolina0/9_00_Cuccagna_ID_183.pdf
<file:///tmp/mozilla_karolina0/9_00_Cuccagna_ID_183.pdf>
Sadly, I can't find anything about how to implement scoring (there is only a list of fluka routines on the last page). How can I generate the 'coincidences file in list mode' from the pages 16-23? Is the reconstruction algorithm available? This tool is everything I need, but apart from the tool which allows to define a PET gantry, I don't see any extra scoring cards for detection of photon pairs with the option to change the time window (time resolution) and filter only annihilation photons (without prompt gammas and bremsstrahlung).
Is this tool available from the standard fluka version?
Thanks in advance,
Karolina
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