RE: [fluka-discuss]: modulator wheel in proton radiotherapy

From: Vasilis Vlachoudis <Vasilis.Vlachoudis_at_cern.ch>
Date: Mon, 16 Jun 2014 06:51:37 +0000

Hi Mohamad,

it is possible to introduce a rotating wheel in your simulations. It will be treated as a moving body.
You will have to modify its parameters (on the bodies that they describe it) during run time, most
preferable with in a custom source routine. For every new particle you change the location of the wheel.

However (even recommended) If you feel uncomfortable with user routines, then the easiest and safest
way would be to make multiple simulations with various geometries. You can use
#define VAR value
to define variables and make a "dynamic" geometry. Using the flair ability to make muliple
runs by tweaking the variables value you simulate several setups. Check the "loop" function.

If you wish to modify a bodies parameter you need the following routines:

* To get the body id (very slow, save the return value, to avoid multiple calls)
   CALL NM2BDY('name....', ID, IERR)

* To reset the body parameters
   CALL RSTBDY(ID, BODYTYPE, WHAT, NWHAT)

Body types:
 ARB 1
 SPH 2
 RCC 3
 REC 4
 TRC 5
 ELL 6
 BOX 7
 WED 8
 RPP 9
 ZCC 10
 ZEC 11
 XYP 12
 XZP 13
 YZP 14
 PLA 15
 XCC 16
 XEC 17
 YCC 18
 YEC 19
 QUA 20
 END 21

Vasilis

________________________________________
From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Mohammad Islam [rafiqul.islam_at_okstate.edu]
Sent: 15 June 2014 07:01
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: modulator wheel in proton radiotherapy

Dear fluka users,

I have a question:
 In proton radiotherapy, a range modulator wheel is usually used to
produce the desired spread out Bragg peak (SOBP). Roughly, the range
modulator wheel rotates when the beam is on and produces the SOBP. My
question is can I introduce a rotating wheel in the input file, i.e
the beam will pass through a rotating wheel of particular speed. Is it
possible to do in FLUKA? I would appreciate any suggestion.

I want to mention that the effect of the modulation wheel can be
produced in some other ways without physically introducing the
modulator wheel. But I am interested if a rotating wheel can be
directly placed in the input.

Thanks
Rafiq
Received on Mon Jun 16 2014 - 10:15:41 CEST