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Protons in the body are forced to align with the magnetic field created by the strong magnets used in MRI machines. The protons are activated and spin out of equilibrium when a radiofrequency current is pulsed through the patient, which causes them to struggle against the magnetic field. The energy produced as the protons realign with the magnetic field can be detected by the MRI sensors when the radiofrequency field is switched off. The surroundings and the chemical make-up of the molecules affect how long it takes for the protons to realign with the magnetic field and how much energy is released. Based on these magnetic characteristics, doctors can distinguish between different types of tissues.
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