An MRI machine or scanner uses a powerful magnet and radio waves linked to a computer to create remarkably clear and detailed cross sectional images of the body.
A urine test checks different components of urine, a waste product made by the kidneys.A regular urine test may be done to help find the cause of symptoms.
X-rays are a form of electromagnetic radiation, as are radio waves, infrared radiation, visible light, ultraviolet radiation and microwaves.