. Author manuscript; available in PMC: 2006 Nov 1.

Published in final edited form as: IEEE Trans Biomed Eng. 2006 Aug;53(8):1635–1646. doi: 10.1109/TBME.2006.877793

Table 1.

A total of 15 possible tissue mixtures for four tissue types in a CT image.

Index	Tissue types	Index	Tissue type
1	Air only	9	Tissue and bone
2	Tissue only	10	Muscle and bone
3	Muscle only	11	Air, tissue and muscle
4	Bone only	12	Air, tissue and bone
5	Air and tissue	13	Air, muscle and bone
6	Air and muscle	14	Tissue, muscle and bone
7	Air and bone	15	Air, tissue, muscle and bone
8	Tissue and muscle