A typical bachelor degree you earn in four years of undergraduate college does not qualify you to work in radilogy. All you need is a two year certificate.
If you actually want to be a Radiologist that is a medical doctor and you will need to complete 13 years to be completely qualified, though as I mentioned you can do a shorter technical school for about a year or two to become a radiology tech.
I would recommend this before trying to be a radiologist. You will get real world on the job training in radiology and find out if you like it as well as have a leg up on others and a better understanding of the field before venturing into and doing 13 years of schooling and investing all that time and money in something you don't know about