i recently had mri of brain and neck. they said they did contrast for one part of it. i didn't have any iv, they pushed something into my vein via needle then finished the test. i don't understand but they didn't tell me i had to drink more after to flush anything out. the worst part of an mri is having to lay so still for a bit. they give you earplugs to help with the loudness of the machine. i find it soothing and tend to start to fall asleep. good luck with a dx.