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Other than the fact that it creates an image of your body for medical purposes...absolutely nothing.

Xray uses ionizing radiation (the potentially harmful kind) which passes through your body. Some of it comes out the other side and reacts with a detector that is behind your body. This creates an image by reflecting how much of the radiation passes through. This is dependent upon what type of tissue it is passing through. Bone, for example, will not allow as much to pass through as soft tissue such as fat or muscle.

MRI is very different and quite complicated. It creates images by measuring the way hydrogen molecules in your body react to a magnet. One of the magnets is switched on and off rapidly and the reactions of the hydrogen molecules will depend upon what type of tissue is there. Hydrogen molecules in fat, for example, are attracted to the magnet very quickly, while hydrogen in water will move more slowly. This is the concept used to get images. It does not use the harmful type of radiation like Xray.

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