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How many materials are needed?

• Du Plessis et al (MP 25(7) 1998)

– Combined 16 human tissues into 7 dosimetrically equivalent

subsets with constant elemental composition to give dose accuracy

of <1%.

– Needed further subdivision in bone and lung (57) by varying

density only

• W.Schneider (stoichiometric) calibrating H with mass density and

elemental weights

– Extended to 71 tissues

– Grouped into 24 bins

– Simplified using interpolation functions for 4 sections of calibration

curve+

• ‘Ctcreate’ from BEAMnrc

– 4 major tissue types (air, lung, soft tissue, bone)

– ICRU tissue composition used and mass density from linear

interpolation