I ran the two 16MVp examples with DOSXYZnrc: the one with the shared library beam source and the one with the phase…

I ran the two 16MVp examples with DOSXYZnrc: the one with the shared library beam source and the one with the phase space source (from the BEAM 16MVp example).

Question: shouldn’t those results agree within statistical uncertainties?

I’m seeing a small systematic difference between those two examples. Comparing only voxels with doses > 30% of the max dose, and taking voxel-by-voxel dose differences divided by the combined uncertainties of the doses, I get the following distribution, which indicates a small systematic error, as well as some asymmetry in the results.

What’s going on here?

In my endeavors I think I’ve come across a bug that may be specific to the Windows only installations but I’m not…

In my endeavors I think I’ve come across a bug that may be specific to the Windows only installations but I’m not totally confident in reproducing it yet without some help.

Basically, my egs_chamber inputs crash on Windows when only IPSS is enabled. I don’t find this issue running the exact same input file on a Linux parallel computing cluster. The Windows input files will run successfully if CS is enabled through the subgeometries and subgeom regions blocks but will crash if those are commented out or absent.

In a somewhat related issue, I was wondering if it’s possible to run a simulation with both correlated and uncorrelated geometries successfully. I want to make use of the statistical accuracy sought feature for my most challenging geometry (a small volume sphere of phantom) but this geometry is not part of the correlated set. So in essence I want the following scoring objects:

1. PHSP Scoring for IPSS

2. Small Volume

3. Full Chamber with correlated subgeoms -> No Stem -> No Cel -> No Wall -> Repl

When I try to run my inputs this way, the Small Volume geometry always gets zeroed out even though only the PHSP scoring object says this MUST be 0. If I use IPSS only (on the Linux cluster) or disable IPSS altogether, then it appears to work as intended.

So in short, I think that 1. My Windows installation of EGS at least will crash if only IPSS is enabled and 2. It would be neat (as someone previously mentioned on this board) if statistical accuracy sought could follow a user-specified scoring geometry and not just the first one

Hi! I’m José Antonio, currently working at Antonio Leal’s laboratory in the University of Seville.

Hi! I’m José Antonio, currently working at Antonio Leal’s laboratory in the University of Seville.

I’m writing because I’m trying to generate a new pegs4 mixture using pegs4.exe. I can’t use the GUI because I need to change the IUNRST value, so when I run “”$HEN_HOUSE/bin/x86_64-unknown-linux-gnu-g77/pegs4.exe -i inputfile -o outputfile””, I’m getting the following error:

fmt: end of file

apparent state: unit 20 named fort.20

last format: (A)

lately reading sequential formatted external IO

Abort (core dumped)

I have a problem in the input, because I’m using more than 24 characters when defining the elements that I’ve used, due to the number of elements that I’m using (15 elements). Any help on this issue? Thanks.

Dear

Dear

I have a problem in installing EGSnrc release 18 on Windows 10. When I launch the EGSnrc installer , after I inter the paths of HEN HOUS egsnrc home I got this massage. In the installation manual for this release it state that you should use git command to have the EGSnrc master folder. I was not able to have git command working so I just download and extract the file directly on the C: path

Any help is appreciated

Hello everyone!

Hello everyone!

I’ve a question about modelling Varian TrueBeam with HDMLC using PSF.

Do I need to add Baseplate with its tungsten shieldings? Or, is it enough to add only JAWS and SYNCHDMLC and one of them also include these parts? (or totally unnecessary at all?) If so, how?

I’ll only work on static open fields with MLC shapes and investigate dose profile and PDD.

Thanks in advance.

EGSperts, the tables have turned and I need your assistance.

EGSperts, the tables have turned and I need your assistance.

Would any one be able to share input files for a source-20 DOSXYZnrc simulation? Hopefully, something that you have validated and possibly published.

I’m investigating discrepancies we observe between an old (~2013) customized version of EGSnrc and the current release. I’m kinda stuck and if I could try reproducing someone else’s validated results, I could at least see if the problem lies with our old version or the new one (or both!).