How do medical detectors work in terms of diagnosing cancer?

Question: How do medical detectors work in terms of diagnosing cancer?
- Keywords:
  cancer,
  work
Asked by delaram to Amanda, Ben, Dan, Gary, Samer on 21 Jun 2013.
- Gary Boorman answered on 21 Jun 2013:
  
  A process called Magnetic Resonance Imaging (MRI) is used. A patient has to lie within a large magnet, and then radio waves are used to look at atoms on the patient’s body. The medical team know what images of the body should look like, and are looking to see differences which may indicate cancers.

Question: How do medical detectors work in terms of diagnosing cancer?