mris use protons, which are abundant in thehuman body. all protons spin creating a small magnetic charge. when a strong magnetic fieldis introduced, as is the case in an mri machine, the protons align with that field. the mritechnician then introduces a radiofrequency pulse that disrupts the proton and forcesit into either a 90 degree or 180 degree realignment with the static magnetic field. since theradiofrequency pulse pushed the proton against
mri scan, its nature, once this pulse is turned off,the protons realign with the magnetic field, releasing electromagnetic energy along theway. the mri is able to detect this energy, and is able to differentiate various tissuesbased on how quickly they release energy after the pulse is turned off.