What is the difference between them?
In: 7
An X-ray shoots X-rays through you once. A CT scan takes a 3D picture by shooting X-rays through you over and over again from a bunch of different angles and working out the density of each point in your body.
MRIs are really magic though, they basically excite different atoms in your body and then see how long it takes them to relax. As the atoms relax, they release radio waves. The MRI scanner picks these up and can tell you the intensity of the radio signals.
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