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Some developments: DECT
DECT exploits energy and compositional dependence of
at keV energies
(E) =
(af
compton
(E) + bf
PE
(E))
a and b depend only on composition of material
Scan at 2 energies to give Z
eff
and electron or mass density
via simultaneous equations
Attenuation is function of medium density and elemental composition
Several materials same HU but different densities and elemental compositions