A radiologic technologist is the person who does x-rays, and with some additional training, can do mammograms, CTs, and MRIs.A radiation therapist administers targeted doses of radiation to the patient's body to treat cancer or other diseases. They make a lot more money than a radiologic technologist.A diagnostic medical sonographer does ultrasounds. They do a lot more than just look at babies. Sonography is used to examine many parts of the body, such as the abdomen, breasts, female reproductive system, prostate, heart, and blood vessels.An x-ray technician is not registered like a radiologic technologist, and cannot do as much or make as much money.You can find out all about these careers at the following link. Read about the different fields and watch the videos: https://www.asrt.org/content/abouttheprofession/_AboutTheProfession.aspx