Iswaafajinta MRI

Midnimada goobta birlabta (isku-midnimada), oo sidoo kale loo yaqaan midnimada goobta birlabta, waxay tilmaamaysaa aqoonsiga goobta birlabta ee ku jirta xadka mugga gaarka ah, taas oo ah, in khadadka goobta birlabta ee ku wareegsan aagga cutubku ay isku mid yihiin. Mugga gaarka ah ee halkan ku yaal badanaa waa meel wareegsan. Cutubka midnimada goobta birlabta waa ppm (qaybtii milyankiiba), taas oo ah, farqiga u dhexeeya xoogga goobta ugu badan iyo xoogga goobta ugu yar ee goobta birlabta ee meel gaar ah oo loo qaybiyay celceliska xoogga goobta oo lagu dhuftay hal milyan.

MRI waxay u baahan tahay heer sare oo isku mid ahaanshaha goobta birlabta, taas oo go'aamisa xallinta booska iyo saamiga calaamadda-ilaa-qaylada ee sawirka ee baaxadda sawirka. Isku mid ahaanshaha liita ee goobta birlabta ayaa sawirka ka dhigi doonta mid aan caddayn oo qalloocan. Isku mid ahaanshaha goobta birlabta waxaa lagu go'aamiyaa naqshadeynta birlabta lafteeda iyo deegaanka dibadda. Inta ay weynaato aagga sawirka ee birlabta, ayaa la gaari karaa midnimada goobta birlabta oo hooseysa. Xasilloonida goobta birlabta waa tusmada lagu cabbiro heerka qulqulka xoogga goobta birlabta waqti ka dib. Inta lagu jiro taxanaha sawirka, leexashada xoogga goobta birlabta waxay saameyn doontaa wejiga calaamadda echo ee la cabbiray ee soo noqnoqda, taasoo keenta qallooca sawirka iyo hoos u dhaca saamiga calaamadda-ilaa-qaylada. Xasilloonida goobta birlabta waxay si dhow ula xiriirtaa nooca birlabta iyo tayada naqshadeynta.

Qodobbada heerka isku-midka goobta birlabta waxay la xiriiraan cabbirka iyo qaabka booska cabbirka la qaaday, guud ahaanna waxay u isticmaalaan booska wareegsan ee leh dhexroor gaar ah iyo bartamaha birlabta sida cabbirka. Caadiyan, matalaadda isku-midka goobta birlabta waxay ku jirtaa xaalad cabbir gaar ah, kala duwanaanshaha isbeddelka xoogga goobta birlabta ee booska la bixiyay (qiimaha ppm), taas oo ah, hal milyan meelood meel xoogga goobta birlabta ugu weyn (ppm) oo ah cutub leexasho si loo muujiyo tiro ahaan, badanaa cutubkan leexashada waxaa loo yaqaan ppm, kaas oo loo yaqaan matalaadda qiimaha buuxda. Tusaale ahaan, isku-midka goobta birlabta ee ku jirta dhammaan dhululubada aperture-ka hubinta iskaanka waa 5ppm; Midnimada goobta birlabta ee ku jirta booska wareegsan ee 40cm iyo 50cm oo isku xiran oo leh xarunta birlabta waa 1ppm iyo 2ppm, siday u kala horreeyaan. Waxa kale oo loo sheegi karaa sida: isku midnimada goobta birlabta ee ku jirta booska saddexjibbaaran ee sentimitir kasta oo saddexjibbaaran ah ee aagga muunadda ee la tijaabiyay waa 0.01ppm. Iyadoo aan loo eegin heerka, iyadoo la tixgelinayo in cabbirka wareegga cabbirku uu isku mid yahay, qiimaha ppm ee yar ayaa tilmaamaya in isku-dhafka goobta birlabta uu ka wanaagsan yahay.

Marka laga hadlayo qalabka 1.5-tMRI, isbeddelka xoogga goobta birlabta ee uu matalo hal cutub oo leexasho ah (1ppm) waa 1.5 × 10-6T. Si kale haddii loo dhigo, nidaamka 1.5T, isku-midnimada goobta birlabta ee 1ppm waxay la macno tahay in goobta birlabta ugu weyn ay leedahay isbeddel leexasho ah oo ah 1.5 × 10-6T (0.0015mT) oo ku salaysan asalka xoogga goobta birlabta ee 1.5T. Sida iska cad, qalabka MRI ee leh awoodaha goobta ee kala duwan, kala duwanaanshaha xoogga goobta birlabta ee uu matalo cutub kasta oo leexasho ah ama ppm way ka duwan tahay, marka laga eego aragtidan, nidaamyada goobta ee hooseeya waxay yeelan karaan shuruudo hoose oo ku saabsan isku-midnimada goobta birlabta (fiiri Jadwalka 3-1). Iyada oo la adeegsanayo qodobkaas, dadku waxay isticmaali karaan heerka isku-midnimada si ay si fudud u barbar dhigaan nidaamyada leh awoodaha goobta ee kala duwan, ama nidaamyada kala duwan ee leh xoogga goobta ee isku midka ah, si ay si macquul ah u qiimeeyaan waxqabadka birlabta.

Kahor inta aan la cabbirin heerka isku mid ahaanshaha goobta birlabta, waxaa lagama maarmaan ah in si sax ah loo go'aamiyo bartamaha birlabta, ka dibna la habeeyo qalabka cabbiraadda xoogga goobta (mitirka Gauss) ee ku yaal wareegga booska ee gacan gaar ah, oo la cabbiro barta xoogga goobta birlabta iyada oo loo marayo dhibic (habka diyaaradda 24, habka diyaaradda 12), ugu dambayntiina la farsameeyo xogta si loo xisaabiyo isku mid ahaanshaha goobta birlabta ee mugga oo dhan.

Isku mid ahaanshaha goobta birlabta ayaa isbeddeli doonta iyadoo la raacayo deegaanka ku xeeran. Xitaa haddii birlabku uu gaaray heer gaar ah (qiimo damaanad qaad warshadeed) ka hor inta uusan ka bixin warshadda, Si kastaba ha ahaatee, ka dib rakibidda, sababtoo ah saameynta arrimaha deegaanka sida gaashaanka birlabta (is-is-), gaashaanka RF (albaabada iyo Daaqadaha), saxanka hagaha hirarka (tuubada), qaab-dhismeedka birta ah ee u dhexeeya birlabta iyo taageerooyinka, agabka qurxinta qurxinta, qalabka nalalka, tuubooyinka hawo-mareenka, tuubooyinka dabka, taageerayaasha qiiqa degdegga ah, qalabka moobaylka (xitaa baabuurta, wiishashka) ee ku xiga dhismayaasha sare iyo kuwa hoose, isku mid ahaanshihiisa ayaa isbeddeli doona. Sidaa darteed, haddii isku midnimadu ay buuxiso shuruudaha sawirka resonance magnetic waa inay ku salaysnaataa natiijooyinka cabbirka dhabta ah waqtiga aqbalaadda kama dambaysta ah. Heerka goobta aan firfircoonayn iyo heerka firfircoon ee gariiradda superconducting ee uu sameeyo injineerka rakibidda ee soo saaraha resonance magnetic ee warshadda ama isbitaalka ayaa ah tallaabooyinka ugu muhiimsan ee lagu hagaajinayo isku mid ahaanshaha goobta birlabta.

Si loo helo calaamadaha la ururiyay ee ku jira habka sawir-qaadista, qalabka MRI wuxuu sidoo kale u baahan yahay inuu dul saaro goobta magnetic-ga ee gradient-ka △B iyadoo la raacayo isbeddello joogto ah oo sii kordhaya oo ku salaysan goobta magnetic-ga ugu weyn B0. Waa la qiyaasi karaa in goobta gradient-ka △B ee lagu dul saaray hal voxel ay tahay inay ka weyn tahay leexashada goobta magnetic-ka ama isbeddelka qulqulka ee uu keeno goobta magnetic-ga ugu weyn B0, haddii kale waxay beddeli doontaa ama xitaa baabi'in doontaa calaamadda booska ee kor ku xusan, taasoo keenta waxyaabo farshaxan iyo yareynta tayada sawirka.

Inta badan isbeddelka iyo isbeddelka leexashada ee goobta birlabta ee ay soo saarto goobta birlabta ee ugu weyn B0, ayaa ka sii dareysa isku-dhafka goobta birlabta, tayada sawirka oo hooseysa, iyo si toos ah ula xiriirta taxanaha cadaadiska dufanka (farqiga soo noqnoqda ee u dhexeeya biyaha iyo dufanka jirka aadanaha waa 200Hz oo keliya) iyo guusha kormeerka magnetic resonance spectroscopy (MRS). Sidaa darteed, isku-midnimada goobta birlabta waa mid ka mid ah tilmaamayaasha muhiimka ah ee lagu cabbiro waxqabadka qalabka MRI.

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Cirbad warbaahineed oo cadaadis sare lehs sidoo kale waa qalab aad muhiim u ah oo kaabayaal ah oo ku saabsan sawirka caafimaadka waxaana badanaa loo isticmaalaa in lagu caawiyo shaqaalaha caafimaadka inay bukaannada u gudbiyaan warbaahinta isbarbardhigga ah. LnkMed waa soo-saare ku yaal Shenzhen oo ku takhasusay soo saarista qalabkan caafimaadka. Tan iyo 2018, kooxda farsamada ee shirkaddu waxay diiradda saareysay cilmi-baarista iyo soo saarista duritaanka wakiilada isbarbardhigga cadaadiska sare leh. Hogaamiyaha kooxdu waa dhakhtar leh in ka badan toban sano oo waayo-aragnimo cilmi-baaris iyo horumarin ah. Hawlahan wanaagsan eeCirbad hal CT ah,Cirbad CT laba madax ah,Cirbad MRI ahiyoCirbad cadaadis sare leh oo loo yaqaan 'Angiography'(Cirbadeeyaha DSA) oo ay soo saartay LnkMed ayaa sidoo kale xaqiijinaysa xirfadda kooxdeenna farsamada - naqshad kooban oo ku habboon, agab adag, Perfect functional, iwm., ayaa loo iibiyay isbitaallada waaweyn ee gudaha iyo suuqyada dibadda.