How to measure 3D volume's dimensions?

[Lottemarijn (Lotte de Roode)]

@lassoan

There are several ways of computing these metrics. The main difference is what is the representation used (surface or volumetric) and if the entire segment is used or only the part that overlaps with the selected scalar volume.

I want to compare a segmentation from an ultrasound image to that of a CT-image. Which of the three values is most accurate to use for this purpose?
Thanks