[Gate-users] FW: LET problem in GATE

[Klára Badraoui Čuprová]

Dear Andreas and Gate users,

thank you for your reply, I have Gate version 8.2. I set electron cut in patient 0.1mm and I did not set step size limit.

OK, yes it seems the voxel size is really the problem. Hopefully then, the solution would be

to create voxel phantom with grid 2mmx2mmx2mm. I wrote my own script to convert CT

dicom slices to mhd and raw files, but the voxel size copies the size of the CT (1.2695,1.2695,2).

I would like to ask, is there some program to resample the dicom CT slices (to grid 2mmx2mmx2mm), output can be either dicom or mhd+raw files?

Thank you in advance,

best regards,

Klára


From: Andreas Resch [mailto:andreas.resch at meduniwien.ac.at]
Sent: Thursday, March 31, 2022 10:47 AM
To: Klára Badraoui Čuprová <Klara.BadraouiCuprova at ptc.cz>
Cc: gate-users at lists.opengatecollaboration.org
Subject: Re: [Gate-users] FW: LET problem in GATE


Dear Klara,

interesting!

Which Gate version are you using? e- production cuts? Max Step size limit?

" May there be some artefact because of calculation grid and phantom voxel size?" yes, that would be my first guess. Seems like is happening every 2-3 voxels, which can come from having a non constant number of geometric boundaries per scoring unit volume, e.g. if CT is 1.2695 mm spaced and calculation grid 2 mm, in the third calculation voxel there are two geometric boundaries, whereas in the first two are only one each.

best,

Andreas

Am 2022-03-31 07:34, schrieb Klára Badraoui Čuprová:

Dear,

I am medical physicist in Proton Therapy Center in Czech and I am concerned with Monte Carlo simulations in GATE for proton therapy.

I calculate dose and LET distributions in patients and in some patients I get strange results for LETdistributions. (Dose distributions are all OK.)

In some LET distributions a line pattern appears (I am attaching printscreen). (The patients with such problem are irradiated from main angles (0°,90° or 270°).

Calculation of LET to water phantom was OK. May there be some artefact because of calculation grid and phantom voxel size? Calculation grid is 2mmx2mmx2mm.

Voxel phantom of one particular prostatic patient is of size 1.2695mm, 1.2695mm, 2mm. Please, do you have some idea why this happens?

I would be very grateful for help.

Best regards,

Klára Badraoui Čuprová





Ing. Klára Badraoui Čuprová, PhD.

Medical physicist

[Popis: Popis: Popis: Popis: Popis: cid:1F7383A9-79F3-4EF6-AB2D-742C8E1A5D06]



Proton Therapy Center Czech s.r.o., Křenova 11, CZ–162 00 Praha 6

Zapsáno v OR u MS Praha, odd. C, 84153, IČ 26466791, DIČ CZ26466791

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