Date: Sun, 11 Aug 2019 16:16:20 +0000
Hi Everyone,
I am trying to recreate a linac head where the beam is incident on a water phantom. I am trying to compare the PDD from the simulation with the experimental measurements. However, when I compare the two PDD's the simulation (in red in the image attached) curve has a higher surface dose and a much slower dose drop off when compared to experiment. The beam energy is 15 MeV 0.1x0.1 beam incident on a tungsten target. The jaws and leaves have been omitted. There is a difference filter within the collimator and flattening filter placed behind it. Would anyone know a possible solution?
Thanks a lot,
Regards,
Jason.
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(image/jpeg attachment: pdd.JPG)
(image/png attachment: Screenshot_from_2019-08-11_17-10-16.png)
(image/png attachment: head.png)