That's great that you are interested in radiology! It's never too early to get a head start and set goals early in life. I think a smart idea would be to shadow a radiologist maybe like once or twice for a few hours, not for your resume, but more for yourself to see if this would be something you could see yourself doing for the rest of your life. When I entered med school, I thought I wanted to be an anesthesiologist, then when I shadowed him for a few hours, I was like hell no there is no way I can sit in the OR for the rest of the afternoon, let alone the rest of my life.
If your heart is truly set on radiology, I would try to do the following at each step:
- college (4 yrs): maintain a good GPA, ace the MCAT (preferably at least 30), obtain leadership positions in extracurricular activities/volunteer groups, do some type of research in any field (if you are interested), volunteer in a hospital/other clinical experience
- med school (4 yrs): do well during your clinical rotations, ace the USMLE Step 1 (preferably at least 230), do research in radiology (e.g., during summer between first and second yrs) and/or publish case report (e.g., at ACR Case-in-Point) or educational exhibit (e.g., at RSNA)
- internship (1 yr): just survive hehe; you can choose either general medicine yr, general surgery yr, or transitional yr which is like a hybrid of many different facets of medicine/surgery
- residency (4 yrs): some programs such as university hospitals are more prestigious/research-focused and other programs are more community oriented/less research focused
- fellowship (most are 1 yr, though some such as neuroradiology can be 2 yrs): start looking for a real job; the vast majority of radiologists end up working for private practices and do not do research for the rest of their lives
Some people, as mentioned above, do take a yr off to do research at some point during the process but personally I feel this is not necessary and actually you are losing a year of earning potential later on. Your goal should be to get through this entire process as quickly as possible, pay off your debt as quickly as possible, and earn an attending salary as quickly as possible.
Radiology is a very intellectual, fast-paced field with great compensation but there is a lot of reading involved and the job is very stressful!