An X-ray uses… well… x-rays. These waves on the electromagnetic spectrum range from 10^(16) to 10^(20) Hz. These allow us to see **SOLID** structures against soft tissue.
MRI machines uses magnets. You don’t receive radiation from these. They were originally discovered by an astronomer researching other galaxies. These allow us to see structures with different densities. We can see soft tissue and distinguish tissue from other tissue.
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