So it looks like you have the ‘region labels’ in the left column, where you have 5 different regions defined (it looks like they have been defined by thresholding of CT data), see Labelmap.png, attached. Here 5 is red, 4 is magenta, 3
is blue, 2 is green, and 1 is yellow.
Then in the right column, you have the density in each voxel; see Density.png, attached.
So yes in principle this is the geometry you need to define as a segmentation in Slicer for DVH. One issue is, in your region label map, bone for instance mostly has a region label of ‘5’ but there are other non-bone structures that also
have this label; soft tissue mostly has a region label of ‘4’ but there are other non-tissue structures with this label also; etc. So you could use these regions for DVH, but there will be some error due to the other non-tissue structure with the same labels
in your dataset.
To fix this, you could import the data in the left column into Slicer as a segmentation, and edit it in the segment editor, and then use for DVH. Or you could import the density map (or, better, use the CT it was derived from) segment
the regions of interest, and use that for DVH.
