To enhance the visibility of organs as they are scanned with magnetic resonance imaging (MRI), patients are usually injected with a compound known as a contrast agent before going into the scanner. The most commonly used MRI contrast agents are based on the metal gadolinium; however, these metal compounds can be harmful for young children or people with kidney problems.

Via:: https://phys.org/news/2017-07-metal-free-mri-contrast-agent-safer.html

Metal-free MRI contrast agent could be safer for some patients

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