Convert relative 3ddose to absolute dose in 3DSlicer

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1

Hello,
I know, DOSXYZnrc like other monte-carlo simulations reports relative (normalized) dose (averaging on the number of histories, the number of histories just relates to dose uncertainty, no change the dose value).
I run DOSXYZnrc, then import the .3ddose output file into 3DSlicer and try to convert it to RT Dose. When I want to convert 3ddose to RT Dose, it takes “unit name” and “dose unit value(scaling)”. I guess, if I change the value scaling, it will change the absolute dose. But I see, when I change the value scaling, no change in absolute dose, and surprisingly, when I change the number of histories (in DOSXYZnrc simulation), I see the absolute dose changes!
Where am I doing wrong?

Operating system: windows 10 64bit
Slicer version: 5.8.1

Any help would be appreciated.

2

The dose unit scaling that you enter when converting a regular volume to RT dose volume does not get hard-applied on the image. Instead, it is considered when calculating the DVH, or when using the Dose Accumulation module. If you want to apply it, I suggest you either do a dose accumulation with this single volume, or you apply it manually. For that I’d use the Simple Filters module / ShiftScaleImageFilter.

If I didn’t answer your question then probably I misunderstood and need some more information.