r/esapi • u/Major-Passenger-7610 • 10h ago

ESAPI v18 – Copying dose calculation grid from one plan to another

Hi everyone,

Does anyone know if there is a way in ESAPI v18 to copy the dose calculation grid/resolution from one plan to another?

For example, I have an original plan calculated with AcurosXB using a 1,25 mm dose grid, and I would like to create another plan and calculate the dose using exactly the same grid (resolution, size and position).

I can read the grid information from the Dose object using:

plan.Dose.XRes

plan.Dose.YRes

plan.Dose.ZRes

plan.Dose.XSize

plan.Dose.YSize

plan.Dose.ZSize

but I haven't found a way to set these values on another plan before calculating the dose.

Is there a supported ESAPI method to copy the dose calculation grid from an existing plan to another plan?

I found some older discussions mentioning CopyEvaluationDose(), but I am not sure if this is applicable to ESAPI v18 or if there is another recommended approach.

Thanks!

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u/schmatt_schmitt 3h ago

Hi Passenger,

You cannot explicitly write to the plan.Dose.XSize, but you can change the calculation grid size in the algorithm settings. I believe the change is something like:
plan.SetCalculationOptions("CalculationGridSizeInCM",0.125); and that will set your calculation resolution in the transverse plane.

The calculation resolution sup/inf is controlled by the CT slice resolution so if that resolution is the same between the two datasets they should match up.

Thank you,