I'm not claustrophibic, and never had MRI or CT with an IV or sedation. The newest machines aren't so loud they hurt, and i noticed the "tunnel" was shorter, too. You'd think they could offer a tranquilizer. Ask. The tech that does it may not have the authority, but they can ask the Doc. My last CT was my head, only (No, there wasn't a brain detected), but others didn't include having to go full-body in, since the two i had in 2003.