The responsibilities of a radiology practitioner assistant, or RPA, involve providing support to a radiologist. In this career, your duties could include performing diagnostic imaging or assisting the licensed radiologist or physician with medical procedures such as biopsies. You interact with a patient before their procedure to gain the necessary information to communicate with the doctor or radiologist. You also follow up to offer post-procedure instructions. As an RPA, you can work in a variety of healthcare settings, including a specialized radiology practice or a hospital.