In-room imaging and MR planning

Beam Hardening Artifacts

Another type of inconsistency is the fact that the Beer Lambert law is simplified without taking into account the energy dependency.

In particular lower energy photons are attenuated more respect to higher energy ones. But the formula used for the reconstruction assumes that the only reasons for different attenuations are the attenuation coefficients and the intersection lenghts.

# Photons

# Photons

polychromatic

monochromatic

E [keV]

E [keV]