Frequency is a key: issue because energy per photon correlates with the frequency of EMR. Study: https://en.wikipedia.org/wiki/Electromagnetic_radiation. Additionally, issue is not just EMR energy transmitted but absorbed (versus just passing through without apparent effect) combined with biologic responses, thus no one 100% understands. MRI (actually NMRI) uses intense magnetic fields & RF EMR, not ionizing like CT.
Answered 2/23/2015
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