If you know the position of each slice then create a sequence file and load that using sequences extension (see details here).
Once you have the slices in their correct position, you can reconstruct a shape from two slices using “Surface cut” effect in Segment Editor module (install SegmentEditorExtraEffects extension to get this effect).
This works amazingly well for generation of breast tumor 3D model from a few position-tracked 2D ultrasound images - see more information here.