Nuclear magnetic Resonance (NMR) yog ib hom kev tshwm sim ntawm nuclear physics. Thaiv thiab Purcell tau tshaj tawm qhov tshwm sim no thaum ntxov li 1946 thiab siv nws rau spectroscopy. Lauter Burr tau luam tawm MR Imaging hauv xyoo 1973, ua rau NMR muaj txiaj ntsig ntau dua li physics thiab chemistry. Nws kuj yog siv nyob rau hauv kev kho mob tshuaj.
Nyob rau hauv xyoo tas los no, magnetic resonance imaging thev naus laus zis tau tsim kho sai thiab ua kom paub ntau ntxiv. Lub peev xwm ntawm kev tshuaj xyuas pib npog tag nrho cov kab ke, thiab tau raug txhawb nqa thiab siv thoob ntiaj teb. Txhawm rau kom muaj kev cuam tshuam cov duab hauv paus thiab zam kev tsis meej pem nrog nuclide imaging, tam sim no hu ua magnetic resonance imaging.
Sib nqus resonance imaging yuav tsum muaj zog sib nqus teb, uas yog generated los ntawm ib tug hlau nplaum. Cov hlau nplaum yog qhov tseem ceeb tshaj plaws thiab kim tshaj plaws ntawm MR Equipment. Tam sim no, ob hom hlau nplaum feem ntau yog siv: cov hlau nplaum ruaj khov thiab electromagnets, uas tau muab faib ua ob pawg: kev ua haujlwm ruaj khov thiab superconductivity.
Cov khoom siv hluav taws xob tsis tu ncua siv cov hluav taws xob ncaj qha ncaj qha ntws los ntawm lub kauj los tsim cov hlau nplaum. Lub zog xav tau los tswj cov hlau nplaum loj yog li 100kW. Feem ntau, nws yuav siv li ob peb teev ntawm hluav taws xob ua ntej qhov chaw sib nqus mus txog lub xeev ruaj khov. Tshaj tam sim no nyob rau hauv lub kauj yuav ua kom muaj cua sov ntau, cua sov exchanger kom txias dej kub dissipation.
Superconducting hlau nplaum tau dav siv tam sim no. Nyob rau hauv lub xeev superconducting, tam sim no ntws los ntawm tus neeg xyuas pib yam tsis tau poob ntawm kev ua haujlwm thiab yog li tsis ua kom sov tus neeg xyuas pib. Ib lub xaim ntawm tib txoj kab uas hla tuaj yeem dhau los ntawm qhov loj dua tam sim no hauv lub xeev superconducting yam tsis muaj kev puas tsuaj. Lub kauj ua los ntawm cov khoom siv superconducting tuaj yeem tsim kom muaj zog sib nqus nrog lub zog tam sim no, thiab tom qab qhov tam sim no sab nraud raug txiav tawm, qhov tam sim no nyob rau hauv superconducting coil tseem tsis hloov, yog li lub superconducting magnetic teb yog qhov ruaj khov heev.
Cov ntaub ntawv hlau nplaum tas mus li tuaj yeem tswj xyuas cov hlau nplaum ntev ntev tom qab kev sib nqus, thiab lub zog hlau nplaum yog qhov ruaj khov, yog li kev saib xyuas ntawm cov hlau nplaum yog qhov yooj yim thiab cov nqi kho mob tsawg heev. Cov hlau nplaum tas mus li siv hauv cov khoom siv sib nqus resonance suav nrogAlNiCo hlau nplaum, Permanent ferrite hlau nplaumthiab NdFeB hlau nplaum, thiab lwm yam. Ntawm lawv, NdFeB hlau nplaum muaj cov khoom siv hluav taws xob sib nqus siab tshaj plaws thiab tuaj yeem ncav cuag qhov siab tshaj plaws kev siv zog nrog ib qho me me (txog {{0}}}.2T teb siv zog yuav tsum tau 23 tons ntawm txhuas nickel. -cobalt, yog siv NdFeB, tsuas yog 4 tons). Qhov tsis zoo ntawm cov hlau nplaum ruaj khov raws li cov hlau nplaum tseem ceeb yog tias nws nyuaj rau ncav cuag 1T qhov kev siv zog. Tam sim no, qhov kev siv lub teb yog feem ntau qis dua 0.5T, uas tsuas yog siv tau rau hauv cov khoom siv hluav taws xob tsawg zaus sib nqus.
Thaum cov hlau nplaum ruaj khov siv los ua cov hlau nplaum tseem ceeb, cov khoom siv sib nqus resonance tuaj yeem tsim nyob rau hauv lub nplhaib lossis tus quab, thiab qhov ntsuas yog ib nrab qhib. Cov qauv no yog qhov zoo rau cov menyuam yaus lossis cov neeg uas muaj claustrophobia.
