|Message: Medical Linac-like Issues||Not Logged In (login)|
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Attachment: http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/11/30/07.41-20079-6_MV_1mmres_11_29.png http://hypernews.slac.stanford.edu/HyperNews/geant4/get/AUX/2012/11/30/07.41-69439-6_MV_3mm_res_11_27.png
I have taken the advanced Medical Linac example and modified it (different flattening filter/etc) and have compared my Geant4 (latest version 4.9.5)results with my ion-chamber measurements using a 6 MV, 20x20 cm field at 100 SSD on a 30x30x30cm water tank. I have tried using the default ROG detector (100 slices in x,y,z) and then using 300 slices in x,y,z. I am fortunate enough to have access to a 100 node cluster and have run different simulations using a 0.1mm range cut in all of the geometry. From the attached graphs I print out the PDD and two profiles at depth of 1.6 cm and at 10 cm. I have no idea why in the 1 mm plot the profiles are sloped when the only thing changed was the detector resolution? In addition I don't know why my profile curves are not flatter as well? I am on my own in looking at this so I would appreciate all help for those with more experience!
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