Labbiska goobta magnetic (isku-noolaanshaha), oo sidoo kale loo yaqaano lebiska goobta magnetic, waxa loola jeedaa aqoonsiga goobta magnetic ee xadka mugga gaarka ah, taas oo ah, haddii khadadka magnetic ee agagaarka unugga ay isku mid yihiin. Mugga gaarka ah ee halkan inta badan waa boos wareegsan. Cutubka lebbiska goobta magnetic waa ppm (qayb halkii milyan), taas oo ah, faraqa u dhexeeya xoogga goobta ugu badan iyo xoogga goobta ugu yar ee goobta magnetic meel gaar ah oo loo qaybiyay celceliska xoogga goobta lagu dhufto hal milyan.
MRI waxay u baahan tahay darajo sare oo lebis magnetic field, taas oo go'aamisa xallinta booska iyo saamiga calaamad-ilaa-sanqa ee sawirka sawirka sawirka. Labbiska liidata ee goobta birlabeedka ayaa sawirka ka dhigi doona mid guduudan oo qalloocan. Labbiska goobta magnetic waxaa lagu go'aamiyaa naqshadeynta magnet laftiisa iyo deegaanka dibadda. Marka ay sii weynaato aagga sawirka ee magnetka, ayaa hoos u dhigaya isku-duubnaanta goobta magnetic waa la gaari karaa. Xasiloonida goobta magnetic waa index si loo cabbiro heerka leexashada xoogga magnetic magnetic waqti. Inta lagu jiro muddada isku xigxiga sawir-qaadista, qulqulatada xoogga magnetic field waxay saameyn doontaa wejiga calaamada dhawaaqa ee soo noqnoqda ee la cabbiray, taas oo keeneysa dhalanrog muuqaal ah iyo hoos u dhaca saamiga signal-ilaa-sanqa. Xasiloonida goobta magnetic waxay si dhow ula xiriirtaa nooca magnetka iyo tayada naqshadeynta.
Qodobbada halbeegga lebbiska goobta magnetic waxay la xiriiraan cabbirka iyo qaabka cabbirka goobta cabbirka ee la qaaday, guud ahaanna waxay isticmaalaan bannaanka wareegsan ee leh dhexroor gaar ah iyo bartamaha magnetka sida cabbirka cabbirka. Caadi ahaan, matalaadda sinnaanta goobta magnetic waa xaalad cabbir cabbir gaar ah, kala duwanaanshaha isbeddelka xoojinta goobta magnetic ee booska la bixiyay (qiimaha ppm), taas oo ah, hal milyan oo meelood oo ka mid ah xoogga weyn ee magnetic (ppm) Unug weecasho ahaan si qiyaas ahaan loo muujiyo, sida caadiga ah unugga leexashada waxa loo yaqaan ppm, kaas oo loo yaqaan matalaadda qiimaha buuxda. Tusaale ahaan, isku-duubnida goobta magnetic ee ku dhex jirta dhammaan dhululubo hubinta iskaanka waa 5ppm; Labbiska goobta birlabeedka ee bannaanka 40cm iyo 50cm ee xoogga leh ee xarunta magnetku waa 1ppm iyo 2ppm, siday u kala horreeyaan. Waxa kale oo lagu tilmaami karaa sida: lebisnaanta goobta magnetic ee bannaanka cube ee sentimitir cubic kasta ee aagga muunada ee tijaabada lagu jiro waa 0.01ppm. Iyadoo aan loo eegin heerka, marka la eego dhismaha in cabbirka cabbirka cabbirku uu la mid yahay, qiimaha ppm oo yaraada ayaa tilmaamaya sida ugu wanaagsan ee isku midka ah goobta magnetic.
Marka laga hadlayo aaladda 1.5-tMRI, isbedbedelka qulqulka xoogga goobta magnetic oo uu matalo hal unug leexasho (1ppm) waa 1.5 × 10-6T. Si kale haddii loo dhigo, nidaamka 1.5T, lebbiska goobta magnetic ee 1ppm macnaheedu waa in goobta magnetic ugu weyni ay leedahay isbedbedelka qulqulka ee 1.5 × 10-6T (0.0015mT) oo ku saleysan asalka 1.5T xoogga magnetic. Sida iska cad, qalabka MRI ee leh awoodo kala duwan, kala duwanaanshaha xoogga magnetic ee matalaya unug kasta oo leexsan ama ppm waa ka duwan yahay, marka laga eego aragtidan, nidaamyada goobaha hoose waxay yeelan karaan shuruudo hoose oo loogu talagalay lebbiska magnetic field (eeg Shaxda 3-1). . Bixinta noocan oo kale ah, dadku waxay isticmaali karaan halbeegga isku midka ah si ay si fudud u barbar dhigaan nidaamyada leh awoodaha kala duwan, ama nidaamyada kala duwan ee leh xoogga isku midka ah, si ay si dhab ah u qiimeeyaan waxqabadka magnetka.
Kahor cabbiraadda dhabta ah ee lebiska goobta magnetic, waxaa lagama maarmaan ah in si sax ah loo go'aamiyo xarunta magnetka, ka dibna la diyaariyo qalabka cabbiraadda xoogga goobta (mitirka Gauss) ee wareegga bannaan ee radius gaar ah, oo la cabbiro xoojinta goobta magnetic. dhibic by dhibic (24 hab diyaarad, 12 hab diyaarad), iyo ugu dambeyntii ka baaraandegi xogta si loo xisaabiyo lebis field magnetic gudaha mugga oo dhan.
Isku-duubnida goobta magnetic-ku waxay bedeli doontaa deegaanka ku xeeran. Xitaa haddii magnet uu gaaray heer gaar ah (qiimaha dammaanadda warshadda) ka hor inta uusan ka tagin warshadda, Si kastaba ha ahaatee, ka dib markii la rakibo, ay sabab u tahay saamaynta arrimaha deegaanka sida magnetic (self-) gaashaan, RF gaashaan (albaabada iyo Windows), saxan waveguide. (tuubo), qaab dhismeedka birta u dhexeeya magnets iyo taageerooyinka, alaabta qurxinta qurxinta, qalabka nalalka, tuubooyinka hawo-qaadista, tuubooyinka dabka, marawaxadaha qiiqa degdega ah, qalabka moobiilka (xitaa baabuurta, wiishka) ee ku xiga dhismayaasha sare iyo kuwa hoose, labiskeedu wuu isbedeli doonaa. Sidaa darteed, haddii labbisku uu buuxiyo shuruudaha sawirka magnetic resonance imaging waa in lagu saleeyaa natiijooyinka cabbirka dhabta ah wakhtiga aqbalaadda kama dambaysta ah. Heerarka goobta dadban iyo heerka firfircoonida goobta firfircoon ee gariiradda korantada sare ee uu sameeyo injineerka rakibaadda soo saaraha resonance magnetic ee warshadda ama isbitaalka ayaa ah tillaabooyinka ugu muhiimsan ee lagu hagaajinayo isku-duubnida goobta magnetic.
Si loo helo calaamadaha la soo ururiyey ee habka baarista, qalabka MRI wuxuu sidoo kale u baahan yahay inuu kor u qaado goobta magnetic gradient △B oo leh isbeddel joogto ah oo sii kordhaya oo ku saleysan goobta magnetic B0 ee ugu weyn. Waxaa la qiyaasi karaa in goobta gradient △B ee ku kor dul saaran hal voxel waa in ay ka weyn tahay leexashada garoonka magnetic ama isbedbedelka qulqulka ee uu keeno goobta weyn ee magnetic B0, haddii kale waxa ay beddeli doontaa ama xitaa baabi'in doontaa calaamada meeleynta sare ee sare, taas oo keeneysa farshaxan iyo yaraynta tayada sawirka.
Way sii weyn tahay isbedbeddelka iyo isbedbeddelka qulqulka magnetic ee ay dhaliso goobta magnetic B0, way ka sii xumaanaysaa labbiska goobta magnetic, tayada sawirka hoos ayey u sii socotaa, iyo in ka badan oo si toos ah ula xidhiidha isku xigxiga isku xidhka dufanka (farqiga soo noqnoqda resonance ee u dhexeeya biyaha iyo dufanka jidhka bini'aadamka waa 200Hz oo kaliya) iyo guusha baaritaanka magnetic resonance spectroscopy (MRS). Sidaa darteed, isku-duubnaanta goobta magnetic waa mid ka mid ah tilmaamayaasha muhiimka ah ee lagu cabbirayo waxqabadka qalabka MRI.
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Mudista warbaahinta isbarbardhiga cadaadiska sares sidoo kale waa qalab caawiye ah oo aad muhiim u ah goobta sawir-qaadista caafimaadka waxaana badanaa loo isticmaalaa in lagu caawiyo shaqaalaha caafimaadka inay gaarsiiyaan warbaahinta isbarbardhigga bukaanka. LnkMed waa soo-saare ku yaal Shenzhen oo ku takhasusay soo saarista qalabkan caafimaad. Tan iyo 2018, kooxda farsamada ee shirkadu waxay xoogga saaraysay cilmi-baarista iyo soo-saarka cirbadaha wakiilka cadaadiska sare. Hogaamiyaha kooxdu waa dhakhtar leh in ka badan toban sano oo khibrad R&D ah. xaqiiqooyinkan wanaagsan eeCT hal durid,CT duri madax labalaab ah,cirbadeynta MRIiyoAngiography cirbadeynta cadaadiska sare(Durida DSA) ay soo saartay LnkMed waxay sidoo kale xaqiijisaa xirfadda kooxdeena farsamada - naqshad isku dhafan oo ku habboon, qalab adag, Perfect functional, iwm, ayaa laga iibiyay isbitaallada waaweyn ee gudaha iyo suuqyada shisheeye.
Waqtiga boostada: Mar-28-2024
