Extracting dose/beam information from a particular treatment plan

[Tlee]

Hi all,

I am interested in extracting influence matrices (Dij), beam
information from a particular treatment plan.
It seems influence matrices and beam information (beam angles,
#beams) can be extracted only after using IMRTP.
Is there any way to get these information from a given treatment data
without the re-setting process using IMRTP?

What I need are Dij matrix and beam information that planners used for
an existing treatment plan.

Thank you,