Amaza emagnetic angashenxisa okanye awonakalise ezinye izixhobo
Izigidi ezingaphezu kwezigidi ezimbini zaseMerika zinesixhobo sonyango esicwangcisiweyo apho ama-50 ekhulwini aza kufuna ukuhlolwa okufuna ukufundwa kwemifanekiso yamagnetic (eyaziwa njenge- MRI scan ). Ii-MRIs zisetyenziselwa ukuxilonga kunye nokujongana neentlobo ezininzi zeemeko zonyango, kubandakanywa iingxaki zomzimba kunye neengqondo ze-cardiovascular. Nangona kunjalo, abantu abaneentlobo ezithile zokufakelwa kwesinyithi abanako ukukwazi ukuqhuba inkqubo.
Isizathu salokhu ukuba i-MRIs isebenzise intsimi enamandla kakhulu ukudala imifanekiso yokuxilonga. Ezinye izifakelo zetsimbi azikwazi ukuphazamisa ukucinga nje kuphela, zinokuchaphazeleka kakubi ngamagagasi amakhulu amakhulu.
Amandla omsakazo (RF) ayenziwe yi-MRI angenza amadivaysi athile asebenze kakubi okanye atshise kakhulu, angonakalisa idivaysi kwaye akhusele umntu. Ukutshintshwa kwezinto kunye nokufuduka kwe-implant ziye zaziwa ukuba zenzeke.
Izimpembelelo ezinokuthi zichaphazelekayo yi-MRIs
Izimpembelelo zetsimbi ezixhomekeke kwiingxaki ngexesha le-MRIs ziquka:
- baxhasi
- iiprovatic heart valves
- izilwanyana zengqondo kwisifo sengqondo
- izifake zetsimbi kwijoni okanye ezindlebeni zesigulane
- catheters
Abantu abaninzi abaneentlobo zezimpembelelo abanako ukufumana i-MRI. Ukongezelela, abantu abalimele iibhola okanye i-shrapnel, okanye abo basebenzisana nezinyithi, kufuneka baxoxwe ngokuchanekileyo ukuba bafumane ukuba ngaba i-MRI iyakwazi.
Azikho zonke izimpembelelo zensimbi ezichaphazelekayo yi-MRI. Abanye baye bachazwa ngokuba "i-MRI ekhuselekileyo" ngelixa abanye bacingelwa "MRI ngokwemimiselo." Enyanisweni, ezinye ze-pacemakers ezintsha kunye neziplani ze-cochlear zisebenzisa ubuchwepheshe obuphambili kwaye zibhekwa zikhuselekileyo xa ziphantsi kweempembelelo ze-MRI.
I-Ferromagnetic Versus Implants Non-Ferromagnetic
Kukho iintlobo ezimbini zetsimbi ezisetyenzisiweyo, nokuba ziyingxenye okanye ngokupheleleyo, kwizimpembelelo ezithile.
Enye i-ferromagnetic kwaye enye ayiyi-ferromagnetic.
Isinyithi se-Ferromagnetic ezifana nesinyithi, i-nickel, kunye ne-cobalt yilezo, xa zifakwa kwi-magnetic field, zibe magnet ngokwabo. Xa ezi zinyithi ziphantsi kweempembelelo ze-MRI, iingxaki zingenzeka.
Okokuqala, i-MRI kunye nensimbi ye-ferromagnetic ibe ngamatshini ahlukeneyo kunye nesigxina esihle. Njengoko nazo zonke iimakethi, ezi zibini ziya kutsalwa kwaye ngokukhawuleza zilungelelanise ipoleni. Ngomnye umbane (i-MRI) eneemitha eziliqela kunye nomnye (ukufakelwa kwe-ferromagnetic) enesisindo esingama-ounces amaninzi, ithonya elinamandla elinamandla ngakumbi linokubangela ukuba i-implant iguquke, iphendukele, ize ichithe ngokupheleleyo.
Isinyithi esingekho-ferromagnetic yilezo ezingabi magnet phantsi kwefuthe le-MRI. Kodwa oko akuthethi ukuba kunjalo abayi kuba yingxaki. Izinyithi ezingafakwanga zange-ferromagnetic zingakwazi ukuphazamisa intsimi yamagnetic eyenziwe yi-MRI kwaye iphazamise imifanekiso ukuze ikwazi ukufunda ngokufanelekileyo.
Ukongezelela, i-RF yamandla eyenziwe yi-MRI inokubangela iingxaki nayiphi na isinyithi esithintelayo ngaphakathi kokufakelwa okungekho ngokungazenzisiyo ukuba yi-transceiver yomsakazo. Xa oko kwenzeka, isinyithi sinokubamba amandla e-RF kwaye iqala ukugqithisa, ingasonakalisa ukufakelwa kunye naluphi na isicu esisijikelezile.
Implantshi yeMetri kunye ne-MRI Safety
Namhlanje, ezininzi izifake zetsimbi, ezibandakanya ama-prostheses emathambo kunye nokufakelwa kwamazinyo, zenziwe ngeensimbi ezikhuselekileyo ze-MRI ezifana ne-titanium. Ezi ziquka izixhobo zokutshintshwa kwe-hip kunye neendolo (iiplates, i-screws, i-rod) kunye nokuzaliswa kwamagumbi.
Nangona zonke iziplani zingaphambukisa umfanekiso we-MRI ukuba kufutshane nendawo yomzimba ichithwa, abaqhelekanga bangabangeli iingxaki abaqeqeshiweyo abanokuzazi.
Xa kuziwa kukhuseleko lwe-MRI, umgca weyona nto: njalo ucebise ugqirha wakho kunye nabasebenzi be-MRI nayiphi na into enokuyifaka enokuthi ayifumane. Nangona ucinga ukuba ukufakelwa kuyahambelana, kubalulekile ukuvumela ochwepheshe ukuba bazi ukuba baqinisekise ukuba i-MRI ikhuselekile okanye i-MRI imeko.
Ezinye iindlela zokucinga (i- CT scans , i- PET scans ) inokufumaneka.
> Umthombo:
> Ikholeji yaseMerika yaseCarology. "I-IRM kwizigulane ezinezixhobo ezifakelelweyo: Iingxoxo ezikhoyo ngoku - Uvavanyo loNgcono." EWashington, DC; Agasti 1, 2016.