Tissue Equivalent Material
Tissue Equivalent Material : Material designed to have interaction properties when irradiated similar to those of soft tissue. Used to make phantoms, such as the ICRU sphere. The tissue equivalent material used in the ICRU sphere has a density of 1 g/cm3 and an elemental composition, by mass, of 76.2% oxygen, 11.1% carbon, 10.1% hydrogen and 2.6% nitrogen, but materials of various other compositions (e.g. water) are considered suitable for particular applications. The term tissue substitute is also used with the same meaning
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