Pima Medical Institute offers an online radiography program for those with previous education in the area. In addition to classroom work, students participate in an externship to receive hands-on experience in a clinic. Graduates earn an associate of occupational science degree.
The University of Missouri offers a bachelor's degree completion program in radiography for students who have an accredited certificate or associate's degree in that subject. The program is completely online and graduates receive a bachelor of health science in the radiologic sciences.
Online courses leading to a degree require students to already be working in the field and are designed for those who want to further their career. It's not possible to find entry-level work as an X-ray technician by taking an online course. However, the University of Virginia Medical School has posted an "Introduction to Radiology" interactive tutorial on their website covering a wide range of subjects and includes tests to check your knowledge.