Essence
Aphysicalphenomenon
Definition
Whentheoscillatingcircuitisinanon-idealstateandthereisresistance,theresistanceheatsupandbecomesadampedoscillation;Whenthereisanexternalperiodicelectromotiveforceintheoscillationcircuit,itwillbecomeaforcedoscillation;whenthefrequencyoftheexternalelectromotiveforceisthesameasthenaturalfrequencyωofthefreeoscillationofthecircuit,theamplitudereachesthemaximumvalue,whichiscalledelectromagneticresonance.
Properties
Whenthesystemisexcitedbytheoutsideandisforcedtovibrate,ifthefrequencyoftheexternalexcitationisclosetothesystemfrequency,theamplitudeoftheforcedvibrationmayreachaverylargevalue.Thisphenomenoniscalledresonance.Asystemhascountlessnaturalfrequencies,andweoftenstudylow-rangesystemfrequencies.
Electromagneticresonanceiselectromagneticresonancewhenthefrequencyofelectromagneticwaveisthesameasthenaturalfrequencyoftheoscillationcircuit
Medicalapplications
Magneticresonanceimaging(MRI),medicalimagingtechnology
Functionalmagneticresonanceimaging(fMRI),MRItechnologytomeasurebrainactivity
MagneticResonanceNeurology(MRN),MRItechnologyimageofthenerve
CardiacMagneticResonanceImaging(CMR),MRItechnologytoassessthecardiovascularsystem
Magneticresonanceangiography(MRA),magneticresonanceimagingtechniqueimagebloodvessels
Magneticresonancecholangiopancreatography(MRCPexamination),MRItechnologyimagebiliarytractandpancreaticduct
EndorectalcoilMRIMRItechnology,imagetheareaaroundtherectum
DelayedGadoliniumEnhancedMagneticResonanceImagingCartilage(dGEMRIC)MagneticResonanceImagingTechnologyImageCartilage
MagneticResonanceElastography(AbsolutePen),MRItechnologytomeasuretissuestiffness
Interventionalmagneticresonanceimaging(Yes)UseMRItechnologytoguidemedicalinterventions
NMRspectroscopicimagingNMRResonancetechnology,collectingcellactivityandmetabolisminformation
Magneticresonancetherapy,proposingtheprincipleoftreatmentbasedonmagneticresonance
Spectroscopyapplications
NMRspectroscopy,atechniquetodeterminethepropertiesofphotonsormolecules
Two-dimensionalnuclearmagneticresonancespectroscopy
Proteinsofnuclearmagneticresonancespectroscopy
Carbohydratesofnuclearmagneticresonancespectroscopy
p>Nuclearmagneticresonancespectroscopyofnucleicacids
Invivomagneticresonancespectroscopy
Solid-statenuclearmagneticresonancespectroscopy
Triple-resonancenuclearmagneticresonancespectroscopy
NMRdecoupling
NMRcrystallography
Electronicparamagneticresonancespectroscopy,technologyandunpairedelectroniclearningmaterials
PulseElectronParamagneticResonance
Microscopeapplication
Magneticresonancemicroscope,nuclearmagneticresonancetechnologyisusedtothescaleof5-10cubicmicrons
Magneticresonanceforcemicroscope,nuclearmagneticresonanceimagingtechnologyisusedfornanometerandsmallerScale
Otheruses
Resonantinductivecoupling,amethodoftransmittingpower
NMRquantumcomputer
MagneticResonanceImaging(Journal)
MagneticResonanceMedicine,"
MagneticResonanceinChemistry,"
MagneticResonanceCenterInvestigationInKingstonuponHull,England
TheIrvingL.HahnInstituteforMagneticResonanceImaginginEssen,Germany
Understandingthephysicalphenomenaofmagneticresonance(quantummechanics)