Add missing center for cube shapes in geometric phantoms
Add missing center for cube shapes in geometric phantoms

fabienmomey/RTK,ldqcarbon/RTK,fabienmomey/RTK,ldqcarbon/RTK,ldqcarbon/RTK,SimonRit/RTK,ldqcarbon/RTK,ldqcarbon/RTK,fabienmomey/RTK,ldqcarbon/RTK,ldqcarbon/RTK,fabienmomey/RTK,fabienmomey/RTK,SimonRit/RTK,SimonRit/RTK,SimonRit/RTK,fabienmomey/RTK,fabienmomey/RTK