Beam Hardening

Category Artifact Cause Term Beam Hardening Definition of Beam Hardening Apparent Increase In Mean Photon Energy After Passing Through Tissue Causing Nonuniform Attenuation Notes About Beam Hardening More Relevant In CT Than Plain Radiography

Fluorine 18 (F 18)

Category Radionuclide Term Fluorine 18 (F 18) Definition of Fluorine 18 (F 18) Positron Emitting Isotope With ~110 Minute Half Life Commonly Used In PET Radiotracers Notes About Fluorine 18 (F 18) Allows Regional Distribution From Cyclotron Or Generator