Proposed use of in vivo x-ray fluorescence to investigate health impact of Gd in MRI contrast agents and Sr in diet

Introduction: In vivo x-ray fluorescence (XRF), along with in vivo neutron activation can be used to measure elemental content in living human subjects. Two examples of current interest will be presented. Gadolinium based contrast agents (GBCA) are widely used, because they greatly facilitate magnetic resonance imaging studies. Initially considered completely benign, it was found that these GBCAs could be damaging to people with compromised …