Segment Statistics Question

Hello,

I have a question about the Segment Statistics module. I am calculating volumes for multiple segments, but I am getting different sets of output values depending on the segment.

For some segments, I get the full set of values:

  • Voxel Count

  • Volume (LM) [mm³]

  • Volume (LM) [cm³]

  • Surface Area (mm²)

  • Volume (CS) [mm³]

  • Volume (CS) [cm³]

But for other segments, I only get:

  • Voxel Count

  • Volume (mm³)

  • Volume (cm³)

Is this normal? What determines whether the Surface Area and Closed Surface measurements appear? Does this mean that the volume values could be inaccurate? All of the data is processed the same way, so I am unsure why the output varies between segments.

Thank you!

Could it be that for some segments it fails to create a closed surface representation?