SHAPE_Sphericity is how spherical a Volume of Interest is. Sphericity is equal to 1 for a perfect sphere.
SHAPE_Sphericity=π1/3⋅(6V)2/3A
where V and A correspond to the volume and the surface of the Volume Of Interest based on the Delaunay triangulation.
SHAPE_Compacity reflects how compact the Volume of Interest is.
SHAPE_Compacity=A3/2V
where V and A correspond to the volume and the surface of the Volume Of Interest based on the Delaunay triangulation.
see:
- https://patents.google.com/patent/US6169817
- https://en.wikipedia.org/wiki/Compactness_measure_of_a_shape
SHAPE_Volume (mL and voxels) is the Volume of Interest in mL and in voxels.
SHAPE_Volume=∑iVi
where Vi correspond to the volume of voxel i of the Volume Of Interest.