On 26.07.2017 01:48, Ševčik Aleksandras wrote:
>
> Dear Lefteris, Mikhail,
>
>
> Thank you very much, it works perfectly. May I ask one more question:
>
> 1) the shape of the beam is annular. If I want to make it rectangular,
> is it enough to change this in BEAM card characteristics, or should I
> modify the source code too?
>
>
> I have a voxelised head phantom and want to score effective dose from
> the simulated spectra in the special regions. I will proceed further
> with help from Activation/AdvancedActivation slides, and will try to
> compare the results from simulation with mathematical calculations
> used by our medical physicists. In case of strong deviation, I may ask
> for your advice once again,
>
>
> Alex
>
> ------------------------------------------------------------------------
> *From:* Eleftherios Skordis <eleftherios.skordis_at_cern.ch>
> *Sent:* Friday, July 21, 2017 12:15:48 PM
> *To:* Ševčik Aleksandras; Mikhail Polkovnikov <Михаил Полковников>;
> fluka-discuss_at_fluka.org
> *Subject:* RE: [fluka-discuss]: Re: regarding x-ray beam simulation of
> dental machines
> Hi Alex,
>
> It could be that there is something missing from the flupix version.
> However, until this is properly fixed you can try running the
> following command in the flupix terminal.
>
> |sudo yum install glibc-devel.i686 libgcc.i686 libstdc++-devel.i686
> ncurses-devel.i686|
> In my case it solved the problem.
> Hope this helps.
>
> Kind regards
>
> Lefteris
>
>
> -----------------------
>
> Eleftherios Skordis
> Dep. EN/STI, CERN
> CH-1211 GENEVA 23
> SWITZERLAND
>
> OFFICE: +41-22-7679541 <tel:%2B41-22-7675461>
> ------------------------------------------------------------------------
> *From:* Ševčik Aleksandras [aleksandras.sevcik_at_ktu.edu]
> *Sent:* 21 July 2017 09:49
> *To:* Mikhail Polkovnikov <Михаил Полковников>;
> fluka-discuss_at_fluka.org; Eleftherios Skordis
> *Subject:* Re: [fluka-discuss]: Re: regarding x-ray beam simulation of
> dental machines
>
> Thanks Mikhail, now it is clear that I am doing smth wrong when
> compiling/running the custom executable, as Eleftherios guessed.
>
>
> When I try to compile it, I get the error, see attached. What it could
> be, looks like cannot find smth ? I am running 64bit flupix, and the
> folder is /home/flupix/New
>
>
> Alex
>
> ------------------------------------------------------------------------
> *From:* Mikhail Polkovnikov <Михаил Полковников> <pmk_at_ihep.ru>
> *Sent:* Friday, July 21, 2017 7:04:32 AM
> *To:* Ševčik Aleksandras; fluka-discuss_at_fluka.org
> *Subject:* Re: [fluka-discuss]: Re: regarding x-ray beam simulation of
> dental machines
> On 20.07.2017 20:13, Ševčik Aleksandras wrote:
>>
>> 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
>>
> Dear Alex,
>
>
> It looks like you didn't compile a source.f routine and didn't run the
> modified FLUKA executive file with the modified source routine (see
> FM.pdf, Chapter 13, User routines). That is why your simulation uses
> only monoenergetic value from the BEAM card!
>
>
> There is no need to use OPEN card in an input file, when you open file
> for reading in source.f (OAUXFI or OPEN calls).
>
>
> Just use either
>
> 1) OAUXFI call in source.f and disable OPEN card
>
> or
>
> 2) OPEN card and do not open file for reading in source.f once again.
>
>
> I prefer first approach nowadays.
>
>
> As a result your scored spectrum should be OK.
>
>
>
> Best regards,
>
> Mikhail
>
Dear Alex,
Since you have been sampling an energy distribution in your custom
source, you must sample a spatial distribution as well!
For rectangular beam shape:
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....
BEAM 7E-05 3.0 5.0 1.0PHOTON
source file:
ZFLK (NPFLKA) = ZBEAM
XFLK (NPFLKA) = XBEAM + (TWOTWO * FLRNDM(XDUMMY) - ONEONE)
& * XSPOT
YFLK (NPFLKA) = YBEAM + (TWOTWO * FLRNDM(YDUMMY) - ONEONE)
& * YSPOT
Best regards,
Mikhail
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Received on Wed Jul 26 2017 - 14:14:46 CEST