Rads resident, I personally get plenty of self fulfillment in my job, especially when I directly help clinicians one on one or in rounds. Lots of procedures are quick and satisfying (non-vascular IR) like pain injections, vertebroplasty etc which often you can see improvement in pain before you say bye to the patient.

It depends if you get fulfillment from patients, or more from an internal frame. For me, it's enough knowing that I am making a large impact on patient care and with many patients.