I just read gadolinium is a heavy metal and can remain in the brain. How long does it remain and how does one get rid of it? I had about 3 or so contrast MRI’s in my 50’s. They were not in the same year,maybe a few years apart. It says a chelating agent is sometimes used to lower the effects of the heavy metal but not all is removed. When would any side effects show up and what might they be? Thanks so much!