In MRI, magnetic fields and radio wave pulses combine to get a unique, and medically beneficial, response from your body's hydrogen atoms. Take a peek in this tutorial.

This Beth Israel Deaconess Medical Center site offers a comprehensive look at MRI exam phases, preparation, technology, equipment, safety, and research. Images and labeled diagrams are also provided on this site.

Sir Oliver Lodge's experiment demonstrating the first tunable radio receiver was an important stepping stone on the path toward the invention of a practical radio.

This site from MedicineNet.com gives an MRI description, why they're performed, risks, and patient preparation. A thorough explanation of the process is provided.