How to read DRR information

[tatsuo25103]

In Eclipse13.6 have a problem.
When I copy plan from old CT to new CT.
The DRR image can't renew to new CT.
So I want add a DRR check in my script.
But I didn't find any command for DRR.
Have any one can teach me how to read Beam's DRR information?
And I saw have the "ReferenceImage" command under the "Beams" command.
I don't know how to use "ReferenceImage" command.
Have anyone can give me example?
Is the "ReferenceImage" command for DRR?

Thanks you very much