CT scan/MRI with titanium screws?

If i have two titanium screws in my knee can i get a CT scan or MRI for my brain?

Can you have an MRI scan if you have a metal plate and screws on a broken bone?

Seeing as an MRI is like a giant electro magnet, if i did need to have an MRI scan in the future then what would happen to the metal plate and screws in have in my arm?

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