[fluka-discuss]: Re: regarding x-ray beam simulation of dental machines

From: Ševčik Aleksandras <aleksandras.sevcik_at_ktu.edu>
Date: Thu, 20 Jul 2017 17:13:08 +0000

Thank you both for your attention, and special thanks to Mikhail, for your created file which I am using.


I added the proposed line, however, my little experiment still shows strong deviation between exemplary ref spectrum and scored spectrum, see attached files.


I also attach all the input files. Where the problem could be?


A.

________________________________
From: Eleftherios Skordis <eleftherios.skordis_at_cern.ch>
Sent: Thursday, July 20, 2017 10:43:48 AM
To: Ševčik Aleksandras; fluka-discuss_at_fluka.org
Subject: RE: regarding x-ray beam simulation of dental machines

Hi Alex,

Your points 1 and 3 are correct. My guess is you are not using the customised executable when you are running and therefore not generating a multi-energetic beam.

Could you please send us your input and output files so I can help you further.

Kind regards

Lefteris


-----------------------

Eleftherios Skordis
Dep. EN/STI, CERN
CH-1211 GENEVA 23
SWITZERLAND

OFFICE: +41-22-7679541<tel:%2B41-22-7675461>
________________________________
From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Ševčik Aleksandras [aleksandras.sevcik_at_ktu.edu]
Sent: 19 July 2017 22:26
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: Re: regarding x-ray beam simulation of dental machines


and hello again, sorry for multiple post, but I thought that it's always better to try a practical example, so here it is: using the attached files and artificially made spectrum.dat for example purposes, I simulated 5x1E6 histories and scored the spectra which does not look similar, maybe anybody could comment what I misunderstand?


Thank you very much,


Alex

________________________________
From: owner-fluka-discuss_at_mi.infn.it <owner-fluka-discuss_at_mi.infn.it> on behalf of Ševčik Aleksandras <aleksandras.sevcik_at_ktu.edu>
Sent: Wednesday, July 19, 2017 9:02:49 PM
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: Re: regarding x-ray beam simulation of dental machines


Addition: I was able to find the answer to 2nd question, it contains pairs of values of energy in keV and flux in photons per second, so it can be ignored.


A.

________________________________
From: Ševčik Aleksandras
Sent: Wednesday, July 19, 2017 7:59:02 PM
To: Vasilis Vlachoudis; fluka-discuss_at_fluka.org
Subject: Re: regarding x-ray beam simulation of dental machines


Thank you very much. I looked all through it, however, it is too complicated for me to pursue it in right way from very beginning without detail step-by-step guidance and clear examples. Therefore I am happy that fluka archive helped me to find the similar case with example I could probably use for my needs. Yet few clarifications are needed:


Attached modified source.f and spectrum source file. Also attached dental x-ray spectra for reference.


1) Do I correctly understand that this source.f file generates polyenergetic photon spectrum, .i.e. such as shown in the attached picture?

2) Could you please help me to understand what exactly is given in spectrum.dat? The first number is just a number of bin, and second - ?

3) Do I understand correctly that in addition I must use BEAM with energy set equal to x-ray used kVp, i.e. maximum energy ?


Thank you very much,

Alex

________________________________
From: Vasilis Vlachoudis <Vasilis.Vlachoudis_at_cern.ch>
Sent: Monday, July 3, 2017 10:08:55 AM
To: Ševčik Aleksandras; fluka-discuss_at_fluka.org
Subject: RE: regarding x-ray beam simulation of dental machines

Hi Aleksandras,

my guess is that the best way will be to create a custom source.f routine
that you sample directly from the spectrum of your x-ray equipment.

Look the advanced course on how to make a custom source

https://indico.cern.ch/event/489973/contributions/2148893/attachments/1271819/1884943/11_AdvancedSources2016.pdf

Cheers
Vasilis


________________________________
From: owner-fluka-discuss_at_mi.infn.it [owner-fluka-discuss_at_mi.infn.it] on behalf of Ševčik Aleksandras [aleksandras.sevcik_at_ktu.edu]
Sent: Friday, June 30, 2017 16:19
To: fluka-discuss_at_fluka.org
Subject: [fluka-discuss]: regarding x-ray beam simulation of dental machines





Dear experts,


I am interested in the calculation of effective doses during the dental -xray procedures. Is it possible to generate a beam only of the specific piece of x-ray equipment when manufacturer's parameters are known, or should one model all the internal components of the machine i.e. the whole x-ray generation process in order to have valid results?


Sorry if this question too obvious. In addition, I would appreciate any links/comments/references that would help me in pursue of this matter,


Regards

Aleksandras



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a_ref_spectrum.jpg
(image/jpeg attachment: a_ref_spectrum.jpg)

b_spectrum.jpg
(image/jpeg attachment: b_spectrum.jpg)

Received on Thu Jul 20 2017 - 20:43:25 CEST

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