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When preparing to undergo an MRI scan Why are patients advised to remove eyeglasses watches jewelry and other metal objects? 

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Patients with other ferromagnetic materials or implants may also undergo MR imaging safely; however, both careful consideration of the factors that influence the deflection of metallic implants and prudent clinical judgment are required before patients who have these objects are examined via MR imaging.
We recommend that patients with this implant should be closely followed up and undergo routine metal artifact-reduction MRI screening.
Therefore, disinfection should be performed for eyeglasses of surgeons.
CI patients who undergo MRI with a magnet in situ may experience complications, especially when imaged below the head.
Patients with this prosthesis can therefore undergo MRI examination safely.
These results indicated that, besides being used to identify external ferromagnetic objects, this ferromagnetic detection system may be a useful tool to screen patients referred for MRI examinations who may have implanted or embedded items.