What is the difference between an MRI machine and an X Ray machine? An MRI machine, which stands for "magnetic resonance imaging" looks at ligaments, tendons and the soft tissues of the body. MRI uses magnetic fields to view the hydrogen atoms in the water in a patient's body while lying in the machine. The procedure can take anywhere from 20 minutes to an hour. Radio frequency fields are then used to change the alignment of the magnetization systematically, causing the hydrogen nuclei to produce a rotating magnetic field detectable by the scanner. This signal can be manipulated to build up sufficient information to construct a replica of the body. MRI's are now being used as a preventative procedure much like a mammogram can be used to prevent breast cancer.
An X Ray machine is used to look at the bones of a body. It is kind of like a camera. Instead of visible light, however, it uses X-rays to expose the film, more like invisible light. X rays use electromagnetic waves, that are more energetic in order to penetrate a variety of different materials and matter at different degrees. When the X-rays hit the film, they expose it just as light would. Since muscle, bone, tumors, and fat all absorb X-rays at different levels, the image on the film lets you see different (distinct) structures inside the body because of the different levels of exposure on the film. Learn more about radiology schools, and what is required to operate this machinery.
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