<html dir="ltr"> <head> <meta http-equiv="Content-Type" content="text/html; charset=iso-8859-1"> <style>  </style><style id="owaParaStyle" type="text/css">P {margin-top:0;margin-bottom:0;}</style> </head> <body ocsi="0" fpstyle="1" class="hmmessage"> <div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">- You probably want to verify the source geometry using the visualization tools of GATE (/gate/source/[name]/visualize ...) rather than attempting to use a reconstructed image to see if you've set the phantom up the way you want. Reconstruction adds a whole layer of parameters to potentially go wrong. It's possible the problem here is somewhere in the conversion from events to sinograms or in the agreement between the geometry of the scanner you've modelled and the geometry STIR is using in the reconstruction. - If I've done the calculation correctly, your sphere-to-background activity concentration ratios are 9288:1 and 4227:1. Something less extreme might be easier to visualize. - Your phantom material is air. Why even bother defining it? - I think if you want isotropic emission, the min and max thetas and phis already default to 0 and 180 and 360, as necessary. <div> <div style="font-family:Tahoma; font-size:13px"> <div style="font-family:Tahoma; font-size:13px"> <div class="BodyFragment"> <div class="PlainText">Jared STRYDHORST <div style="margin:0">Laboratoire Imagerie Moléculaire In Vivo (IMIV) UMR 1023 Inserm/CEA/Université Paris Sud - ERL 9218 CNRS</div> <div style="margin:0">CEA/I2BM/Service Hospitalier Frédéric Joliot</div> <div style="margin:0">4, place du Général Leclerc 91401 ORSAY Cedex <a href="mailto:karima.ait-aissa@cea.fr" target="_blank"></a></div> <div style="margin:0"><a href="http://i2bm.cea.fr/dsv/i2bm/shfj/imiv" target="_blank">http://i2bm.cea.fr/dsv/i2bm/shfj/imiv</a></div> </div> </div> </div> </div> </div> <div style="font-family: Times New Roman; color: #000000; font-size: 16px"> <hr tabindex="-1"> <div style="direction: ltr;" id="divRpF764975">De : gate-users-bounces@lists.opengatecollaboration.org [gate-users-bounces@lists.opengatecollaboration.org] de la part de Lorena Vázquez Canelas [lowry_v_c@hotmail.com] Envoyé : vendredi 5 février 2016 15:10 À : gate-users@lists.opengatecollaboration.org Objet : [Gate-users] SOURCE-RECTANGULAR </div> <div></div> <div> <div dir="ltr">Hi Gaters, i made a case very simplified of simulation without forbid comand but the reconstruction is a little strange! <div id="inlineImage0" style="display:inline-block"> <div class="inlineImage" style="display:inline-block"><img src="cid:inlineImage0" height="389" width="698"></div> </div> It's only rectangular source (as background) and two spheres of 10 and 13 mm of diameter, but shape according to image is circular and no rectangular. The output that i have to reconstruct the image is through sinograms to use STIR later. My code is only the following: /gate/world/daughters/name phantom4 /gate/world/daughters/insert box /gate/phantom4/geometry/setXLength 14. cm <div dir="ltr">/gate/phantom4/geometry/setYLength 8.3 cm /gate/phantom4/geometry/setZLength 21.5 cm /gate/phantom4/placement/setTranslation 0.0 -7.65 0.0 cm /gate/phantom4/setMaterial Air /gate/phantom4/attachPhantomSD # SOURCES: # Background /gate/source/addSource twogamma /gate/source/twogamma/setActivity 90 MBq /gate/source/twogamma/setType backtoback /gate/source/twogamma/gps/particle gamma /gate/source/twogamma/gps/energytype Mono /gate/source/twogamma/gps/monoenergy 0.511 MeV /gate/source/twogamma/gps/type Volume /gate/source/twogamma/gps/shape Para /gate/source/twogamma/gps/halfx 7 cm /gate/source/twogamma/gps/halfy 3.85 cm /gate/source/twogamma/gps/halfz 10.15 cm /gate/source/twogamma/gps/centre 0. -7.35 0. cm /gate/source/twogamma/gps/angtype iso /gate/source/twogamma/gps/mintheta 0. deg /gate/source/twogamma/gps/maxtheta 180. deg /gate/source/twogamma/gps/minphi 0. deg /gate/source/twogamma/gps/maxphi 360. deg /gate/source/list # Sphere 10mm diameter: /gate/source/addSource 10mm /gate/source/10mm/setActivity 200 MBq /gate/source/10mm/setType backtoback /gate/source/10mm/gps/particle gamma /gate/source/10mm/gps/energytype Mono /gate/source/10mm/gps/monoenergy 0.511 MeV /gate/source/10mm/gps/type Volume /gate/source/10mm/gps/shape Sphere /gate/source/10mm/gps/radius 0.5 cm /gate/source/10mm/gps/centre -2.86 -4.954 0. cm /gate/source/10mm/gps/angtype iso /gate/source/10mm/gps/mintheta 0. deg /gate/source/10mm/gps/maxtheta 180. deg /gate/source/10mm/gps/minphi 0. deg /gate/source/10mm/gps/maxphi 360. deg /gate/source/list # Sphere 13 mm diameter: /gate/source/addSource 13mm /gate/source/13mm/setActivity 200 MBq /gate/source/13mm/setType backtoback /gate/source/13mm/gps/particle gamma /gate/source/13mm/gps/energytype Mono /gate/source/13mm/gps/monoenergy 0.511 MeV /gate/source/13mm/gps/type Volume /gate/source/13mm/gps/shape Sphere /gate/source/13mm/gps/radius 0.65 cm /gate/source/13mm/gps/centre 2.86 -4.954 0. cm /gate/source/13mm/gps/angtype iso /gate/source/13mm/gps/mintheta 0. deg /gate/source/13mm/gps/maxtheta 180. deg /gate/source/13mm/gps/minphi 0. deg /gate/source/13mm/gps/maxphi 360. deg /gate/source/list</div> Do you know what can it happen? Thanks in advance!! </div> </div> </div> </div> </body> </html>