When are MRIs not practical?

Question

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.

Published on: March 11, 2003
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Dr. Greene is a practicing physician, author, national and international TEDx speaker, and global health advocate. He is a graduate of Princeton University and University of California San Francisco.
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