An MRI is used to show "soft-tissue" damage that doesn't show on an X-ray, plus you are not exposed to the radiation. Why would anyone want to risk putting a foreign substance into their veins just to possibly 'contrast' what the MRI will show at one degree image without risking possible side effects?

Please do not allow anyone to put any type of "DYE" into your veins. You very well could "DIE" as a result from the dye.