Why isn’t it a standard practice to use metal detectors and smaller magnets on a patient before putting them in an MRI machine?

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Especially if a patient is not lucid, wouldn’t it make sense to, firstly, check with a metal detector if there is anything metal inside, then use a small magnet to see if that something would cause problems, and only then put the patient inside the MRI machine? I guess there must be a good reason not to do that routinely, right?

In: Physics
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Almost all MRIs are of patients with known medical records. Those records should include implanted metal. Metal detectors aren’t that accurate, to find a small screw or pin.

You’d have way better luck finding small pieces of metal by just throwing the person in a full body xray/take multiple xrays, metal shines on xrays, i should know, I have enough in me.