[Gate-users] linear accelerator simulations (Nicollas Goncalves Cavedini)

Thu Sep 3 20:59:31 CEST 2020

Dear Zakaria,
I would like to thank you for your help!

*Best regards,*

*Nícollas Gonçalves Cavedini*
Bachelor of Medical Physics (PUCRS)
Master's Student in Electrical Engineering - PPGEE (PUCRS)
CV: http://lattes.cnpq.br/7248406497106855
Contact: +55 (51) 99922-9957
Porto Alegre, Brazil.

Em qui., 3 de set. de 2020 às 09:18, Zakaria Aboulbanine <
zakaria.aboulbanine at gmail.com> escreveu:

> Dear Nicollas,
>
> To perform your linac Monte Carlo simulation I think you need to perform
> the following steps :
>
> 1. Define the correct electron beam parameters (spatial
> distribution/average energy). Assuming you have a correct geometry model,
> you need to choose correct cut-off values for each of your simulated parts
> (linac/water phantom).
>
> 2. Compare normalized dose distributions of the simulation (profiles/PDD)
> to normalized measured dose distributions for many radiation fields
> starting with the 10x10 cm2 reference field. You have to reproduce in your
> simulation the setup used for the measurements.
>
> 3. adjust your model to get the best accuracy.
>
> 4. according to the calibration conditions (for example 1Gy at 10 cm
> depth) you can determine the corresponding number of simulated primary
> particles needed to get this dose at the indicated depth. The unit number
> or the irradiation time will be equivalent to the number of simulated
> primary histories.
>
> Regards.
>
> --
> Zakaria Aboulbanine
>
>
>
>
> Le jeu. 3 sept. 2020 à 12:37, <
> gate-users-request at lists.opengatecollaboration.org> a écrit :
>
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>> Today's Topics:
>>
>>    1. Too much Randoms in NECR test (Martin Sower)
>>    2. Simulation stuck at geometry initialization (Khalid Hussain)
>>    3. linear accelerator simulations (Nicollas Goncalves Cavedini)
>>
>>
>> ----------------------------------------------------------------------
>>
>> Message: 1
>> Date: Wed, 2 Sep 2020 17:47:29 +0100
>> From: Martin Sower <melkatib1 at gmail.com>
>> To: gate-users at lists.opengatecollaboration.org
>> Subject: [Gate-users] Too much Randoms in NECR test
>> Message-ID:
>>         <
>> CAHrTDnO8O74fQEP+jRgO+o3GedgsucMoCcV7BYg6FAk5jFWRpg at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Dear Gaters,
>>
>>
>> I am trying to validate my Biograph mCT model, and I am stuck in the
>> NEMA-07 NECR test;
>>
>> The problem is that I am getting too much Randoms that leads to low of
>> NECR
>> peak than other similar published studies; This issue has been reported
>> previously by many other Gate users;
>>
>> SIMULATION DETAILS:
>> ==================
>> I am simulating the NEMA Phantom with a line source filled with an
>> activity
>> concentration of 30 kBq/ml (calculated by dividing the total activity of
>> 660 MBq by the Phantom volume); This activity concentration has been taken
>> from "Jackoby et al. 2011" article, which corresponds to the NECR peak of
>> 180 kcps from the experiment; I am getting a poor NECR value of about 60
>> kcps at this activity;
>> The Randoms rate am getting is about 85% of total coincidences counts;
>> I tried the modification of dead times and pileup values but the Randoms
>> count is always too high;
>>
>>
>> PLEASE if somebody has well done the NECR test for the Biograph mCT, mMR
>> or
>> any other PET, and has solution or advices regarding this issue of
>> Randoms,
>> your help will be greatly appreciated;
>>
>>
>> Thank you in advance.
>> Martin Sower
>> -------------- next part --------------
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>> ------------------------------
>>
>> Message: 2
>> Date: Wed, 2 Sep 2020 22:24:02 +0500
>> From: Khalid Hussain <khalidhussain1134 at gmail.com>
>> To: gate-users <Gate-users at lists.opengatecollaboration.org>
>> Subject: [Gate-users] Simulation stuck at geometry initialization
>> Message-ID:
>>         <
>> CAFjakMKukOvMgG6DcGanGbxzdrf8dzmcTf_yGeuhBG487JowcQ at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Dear Gate users,
>>
>> My simulation stuck at geometry initialization in vGate 8.2, I have tested
>> the geometry by expanding in two dimensions and it seems okay for all
>> combinations but stuck when using full geometry in 3D.
>>
>> Please see below script of suspected part of geometry.
>>
>>
>> ############################
>> # LOW ENERGY HIGH RESOLUTION COLLIMATOR #
>> ############################
>>
>> # C O L L I M A T O R
>>
>> /gate/SPECThead/daughters/name collimator
>> /gate/SPECThead/daughters/insert box
>> /gate/collimator/geometry/setXLength 59.1 cm
>> /gate/collimator/geometry/setYLength 44.5 cm
>> /gate/collimator/geometry/setZLength 4.0 cm
>> /gate/collimator/placement/setTranslation 0. 0. -3.8 cm
>> /gate/collimator/setMaterial Air
>> /gate/collimator/attachPhantomSD
>> /gate/collimator/vis/forceWireframe
>> /gate/collimator/vis/setColor white
>>
>>
>> ## Insert upper boundary of hole
>>
>> /gate/collimator/daughters/name hole
>> /gate/collimator/daughters/insert box
>> /gate/hole/geometry/setXLength 0.17 cm
>> /gate/hole/geometry/setYLength 0.17 cm
>> /gate/hole/geometry/setZLength 0.02 cm
>> /gate/hole/placement/setTranslation 0. 0. 0. cm
>> /gate/hole/setMaterial Lead
>> /gate/hole/vis/forceWireframe
>> /gate/hole/vis/setColor blue
>> ## Insert lower boundary of hole
>>
>> /gate/hole/daughters/name lowerB
>> /gate/hole/daughters/insert box
>> /gate/lowerB/geometry/setXLength 0.15 cm
>> /gate/lowerB/geometry/setYLength 0.15 cm
>> /gate/lowerB/geometry/setZLength 0.02 cm
>> /gate/lowerB/placement/setTranslation 0. 0. 0. cm
>> /gate/lowerB/setMaterial Air
>> /gate/lowerB/vis/forceWireframe
>> /gate/lowerB/vis/setColor green
>>
>> # FILL THE WHOLE COLLIMATOR WITH SEPTA-HOLE
>> /gate/hole/repeaters/insert cubicArray
>> /gate/hole/cubicArray/setRepeatNumberX 347
>> /gate/hole/cubicArray/setRepeatNumberY 261
>> /gate/hole/cubicArray/setRepeatNumberZ 100
>> /gate/hole/cubicArray/setRepeatVector 0.17 0.17 0.04 cm
>>
>>
>>
>> Any help is highly appreciated.
>>
>> Thanks and regards
>> Khalid
>> -------------- next part --------------
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>> ------------------------------
>>
>> Message: 3
>> Date: Wed, 2 Sep 2020 15:22:47 -0300
>> From: Nicollas Goncalves Cavedini <nicollas.cavedini at acad.pucrs.br>
>> To: gate-users <Gate-users at lists.opengatecollaboration.org>,
>>         david.boersma at acmit.at
>> Subject: [Gate-users] linear accelerator simulations
>> Message-ID:
>>         <CAMTcvvb3xRWUg36B2bxkZ7+X=
>> i8uPMHxvdNn3_VdyO2FFFDRFA at mail.gmail.com>
>> Content-Type: text/plain; charset="utf-8"
>>
>> Dear GATE community,
>>
>> I am master's student and I am trying to validade the GATE software for
>> photon therapy 6 MV radiotherapy planning at the hospital in Porto Alegre,
>> Brazil. I modeled the linear accelerator with a 40x40x40 cm³ cubic water
>> phantom. I have the PDP values of the linear accelerator and I would like
>> to know how I can perform the calibration with the simulation.
>>
>> I would also like to set up a treatment plan with monitor units and
>> different gantry positions, how can I do this?
>>
>> *Best regards,*
>>
>> *Nícollas Gonçalves Cavedini*
>> Bachelor of Medical Physics (PUCRS)
>> Master's Student in Electrical Engineering - PPGEE (PUCRS)
>> CV: http://lattes.cnpq.br/7248406497106855
>> Contact: +55 (51) 99922-9957
>> Porto Alegre, Brazil.
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