How is the volume calculated in Labelmap statistics

Hello!
I am new to Slicer and I’m trying to calculate the volume of the pituitary gland from MRI slides. Now I can segment the pituitary gland out and use segment statistics to calculate its volume. However, I wondering how is the volume calculated out of discrete slides and what assumptions are made?

Appreciate

Hello @Chenglin_Zhu

Here is some documentation
https://slicer.readthedocs.io/en/latest/user_guide/modules/segmentstatistics.html

Actual code

-Andinet

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