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Forum: Geometry
Re: Question /gun/position (Reema)
Re: None RE: /gun/position (John Apostolakis)
Date: 15 Oct, 2007
From: Reema <Reema>

Hi John, Thanks a lot for the response.

I am simulating a half cone beam CT system. The volumes in my simulation are a cylinderical phantom and a box detector placed in a box world. The source at (-46.5,0,15)cm is emitting x-ray photons in the x-direction towards the cylinderical phantom (radius=7cm and height=10.5cm) with the centre located at (0,0,9.75)cm and detector located at (31.5,0,0)cm

In the PrimaryGenratorAction, I set the energy of the particle. I am randomly generating a rectangle beam such that its length1=diameter of the cylinder phantom and l2=height of the cylinder phantom. Thus the positions where the x-ray photons hit the phantom is generated randomly but within the area of the rectangle defined. The direction of the x-ray photons in the beam is then the diffence between the position where the photon is intended to hit the detector and source position.

Hope this explains it all. Let me know if you need more information. Thanks again for helping me! :) Best regards, Reema

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