How to Score Neutron Energy Spectrum in a Voxelized Patient?

Scoring
1

Hi Fluka community,

I need some help with a specific issue. I’m running a simulation with a voxelized patient coming from a CT-DICOM data, and I’m interested in measuring the neutron differential fluence (so the energy spectrum) within a defined volume inside the voxelized patient.

Since each voxel is treated as a separate region, I can’t use the USRTRACK or USRBDX cards to score over a larger region, because this would overlap with the regions of the voxels. Is there an easy, straightforward way to achieve this, or would I need to implement a user routine?

I’d appreciate any guidance you can provide.

Thank you for your help!

Best regards,
Jonas

1 Like
3

Hi Jonas,

with the present version of FLUKA there is no easy solution for that.

One possible thing you can try if you have an RTSTRUCT information you can assign a unique material/region to the RTSTRUCT inside the voxel. This can be done by flair when you create the VOXEL file, and then use that for scoring.
From Dicom → Voxel → 2. RTSTRUCT and Material

image
image2208×676 129 KB

Select the material and create a boolean operation on the ROI you are interested.
Flair should create a unique region there with a common material
The materials are taken from the material database

1 Like