Medical imaging, whats it all about?

Does anyone do this for a living. X-ray,MRI,CAT scan etc. I am in San Diego. Where did you go to school? ,how much did it cost, and how long was your program, how hard was your schooling? How does your day play out. What do you make starting out and what can you hope to make after putting in 5 years or so? Are there any prereqs. to the program, if so what? It seems like there are alot of different areas doing different types of imaging. Do you suggest one or the other. Thank you for your time!!