When are MRIs not practical?

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Q

You mentioned that, MRIs are almost always preferable to CTs for imaging the head, and usually for the spine, except during trauma or when MRIs are not practical - such as when there are metal clips on the head. Why is the MRI not practical when there are metal clips in the head? Kindly explain.

drgreene

The MRI is a very strong magnet -- you would not want it to move around metal clips in the head, or anywhere else in the body!

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