Bugfix/topas cordinate system

[JenHardt]

We noticed a asymmetry in the simulated dose by TOPAS if the main beam direction is not the z direction, the interface was changed to have the beam along z with the patient being rotated

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 3 lines in your changes missing coverage. Please review.

Project coverage is 50.24%. Comparing base (30d5d9b) to head (5713c15).
Report is 1 commits behind head on rc/v3.

Files with missing lines	Patch %	Lines
...gines/@matRad_DoseEngineBase/getAvailableEngines.m	0.00%	1 Missing ⚠️
...nes/@matRad_DoseEngineBase/matRad_DoseEngineBase.m	50.00%	1 Missing ⚠️
...atRad/doseCalc/+DoseEngines/matRad_TopasMCEngine.m	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##            rc/v3     #790      +/-   ##
==========================================
- Coverage   50.28%   50.24%   -0.04%     
==========================================
  Files         598      598              
  Lines       37258    37262       +4     
==========================================
- Hits        18734    18722      -12     
- Misses      18524    18540      +16     

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[wahln]

Looks like a very neat fix with minimal changes, thanks. If I understand it correctly, it is done solely by rotating to a different orientation in the TOPAS template file, right?

[wahln]

Could you please quickly explain to me the logic behind the new rotated system?

[JenHardt]

So the idea is that we have to rotated by 90 degrees along the z axis and then along the x axis to get the basic patient rotation, so that at gantry and couch angle 0 the beam is along the patients yaxis. I split the rotations up like this to have the correct order of rotations

[wahln]

One more question, what gantry angle / couch angle combinations did you test it with?

[JenHardt]

One more question, what gantry angle / couch angle combinations did you test it with?

sure i tested the gantry and couch angle combinations of (0,0), (0,90),(90,0), and (45,45)