Radiologyworkers.com

RTs do more than just x-rays of bones. We do fluoroscopy studies (involving the intestinal tract and barium), arthrograms (assisting the radiologist with injecting contrast or dye into joints for evaluation) and myelograms (assisting the radiologist with injecting contrast into the spinal canal). If you work in a hospital setting, you will do portable exams in ICU, CCU, the ER and even surgery. Some RTs take x-rays in the morgue.
Most RTs will also become proficient and licensed in other modalities, such as mammography, angiography, CT and/or MRI. These are skills that you can learn on the job, if your employer is willing to cross-train you. A year after passing the ARRT, you can take examinations to earn additional licenses. The more licenses you have, the more money you can make, as you will be in higher demand. With additional schooling, you can also do ultrasound.
The RT program I went to had students do a 4 week rotation through CT, MRI, mammography, angiography, Cardiac Cath Lab, Nuclear Medicine and Radiation Therapy. That was not nearly enough time to become proficient at these modalities. I think it was used as an opportunity for us to see what the other modalities are about. It was kind of for just general knowledge. I got my ARRT and went to work for a free standing imaging facility. There I was cross trained in CT, MRI, DEXA and mammography. I did not do any additional formal schooling, but I had to find books to buy so I could study for and pass my licensing examinations. Best wishes….

Surely you did some research before starting into a profession that you know nothing about.