[Gate-users] TPSPlan simulations

[David Boersma]

Hi Jakub,


It's not a bug, it's a feature. :)


The first version of the TPS pencil beam source actor was written about a decade ago, and a stub for the couch angle was included to be implemented later. This never happened, and two years ago it was decided that actually it would be better to *not* include this functionality in the TPS pencil beam source actor, but rather let the users rotate "the patient" (or rather the CT image) themselves. For file reading compatibility reasons the couch angle is still read in, but indeed, it's not used.


Obviously this should be documented better, to avoid this kind of confusion. Sorry about that!


HTH,

David Boersma

________________________________
Von: Gate-users <gate-users-bounces at lists.opengatecollaboration.org> im Auftrag von jbaran <jbaran at ifj.edu.pl>
Gesendet: Freitag, 4. Oktober 2019 14:46:04
An: Gate Users
Betreff: [Gate-users] TPSPlan simulations

Dear GATE Community,

I am trying to validate the GATE software with TPS (GATE-RTion) for
proton radiotherapy planning at our centre in Cracow. I prepared the
beam model and CT calibration as requested at GATE wiki. For the dicom
plan conversion I used clitkDicomRTPlan2GATE from VV software.
I found one problem in the simulations. I believe the
PatientAngleSupport (couch angle) is not taken into account at all. I
simplified the whole plan to just one spot and run the simulation with
GATE and compared with TPS. Let say in original plan PatientSupportAngle
is 340. However, the dose profile of the spot suggest that that Patient
Support Angle is 0. For testing purpose I changed just the
PatientSupportAngle into 300 and 200. But the dose profiles looks
exactly the same as in case of 340 (they are situated exactly in the
same position for all three cases and doesn't correspond to the proper
dose profile from TPS).

Please find attached a few images shown the dose map imposed on the CT.

The plan description file is as follows:
#TREATMENT-PLAN-DESCRIPTION
#PlanName
Toto
#NumberOfFractions
1
##FractionID
1
##NumberOfFields
1
###FieldsID
1
#TotalMetersetWeightOfAllFields
1

#FIELD-DESCRIPTION
###FieldID
1
###FinalCumulativeMeterSetWeight
1
###GantryAngle
110
###PatientSupportAngle
340
###IsocenterPosition
10 -239.4 -785
###NumberOfControlPoints
1

#SPOTS-DESCRIPTION
####ControlPointIndex
0
####SpotTunnedID
3.0
####CumulativeMetersetWeight
0
####Energy (MeV)
175.228
####NbOfScannedSpots
1
####X Y Weight
15 -35 1
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