Eli5 : Why cant you compare xrays to MRI’s ?
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You…can. Why would you think they can’t be? X-rays are literally used to instruct when and how to use MRI.
Specifically, x-ray is usually the first investigation into injury (at least physical damage–like from falls and sports, but also some diseases) because it’s easy, fast, and cheap. But x-ray only shows one plane of hard tissue. MRI is just a better view of inside the body and can examine soft tissue (tendon, ligament, tumors, etc) as well and can be improved with contrast for even higher quality images.
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