@feruze-- That's what I thought too but @anon306020 mentioned an extremity scanner. So maybe you don't have to after all.
I thought that no matter which part of your body the MRI is for, you lie in the MRI machine and then the technician will concentrate on the area that needs to be filmed.
That is frustrating though because an MRI is not fun. It really is claustrophobic. The first time I got an MRI, they didn't even tell me how long it would take or the loud noises that would be coming from the machine. So I literally had an anxiety attack while I was inside. I don't like MRIs for this reason but I know that sometimes they're necessary.