The MRI machine produces an image using a strong magnetic field and sends pulses of radio waves from a scanner. Together they change the alignment of the hydrogen protons in your body - causing radio signals to be sent out. These signals are received and analyzed by a computer that creates a 3 dimensional image. MRI is a good way to image soft tisse structures like nerves, discs, and ligaments.
MRI is useful to evaluate
problems of the spinal discs
MRI is not safe if you have non-MRI compatible metallic implants, such as pacemakers. MRI does not use radiation and poses no increased cancer risk.