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.
Dr. Greene's Answer
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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