Daidaito tsakanin MRI da

Daidaiton filin maganadisu (haɗuwa), wanda kuma aka sani da daidaiton filin maganadisu, yana nufin asalin filin maganadisu a cikin takamaiman iyaka na girma, wato, ko layukan filin maganadisu a faɗin yankin naúrar iri ɗaya ne. Takamaiman girman a nan yawanci sarari ne mai siffar ƙwallo. Naúrar daidaiton filin maganadisu ita ce ppm (sashi a kowace miliyan), wato, bambanci tsakanin matsakaicin ƙarfin filin da mafi ƙarancin ƙarfin filin maganadisu a cikin takamaiman sarari da aka raba ta matsakaicin ƙarfin filin da aka ninka da miliyan ɗaya.

MRI yana buƙatar babban matakin daidaiton filin maganadisu, wanda ke ƙayyade ƙudurin sarari da rabon sigina zuwa amo na hoton a cikin kewayon hoto. Rashin daidaiton filin maganadisu zai sa hoton ya dusashe kuma ya karkace. Daidaiton filin maganadisu yana ƙaddara ne ta hanyar ƙirar maganadisu da kuma yanayin waje. Girman yankin hoton maganadisu, ƙarancin daidaiton filin maganadisu za a iya cimmawa. Daidaiton filin maganadisu ma'auni ne don auna matakin karkatarwar ƙarfin filin maganadisu da lokaci. A lokacin jerin hotuna, karkatarwar ƙarfin filin maganadisu zai shafi matakin siginar amsawar da aka maimaita, wanda ke haifar da raguwar hoto da raguwar rabon sigina zuwa amo. Daidaiton filin maganadisu yana da alaƙa da nau'in maganadisu da ingancin ƙira.

Tanadin daidaitaccen filin maganadisu yana da alaƙa da girma da siffar sararin aunawa da aka ɗauka, kuma gabaɗaya ana amfani da sararin mai siffar ƙwallo mai diamita da tsakiyar maganadisu a matsayin kewayon aunawa. Yawanci, wakilcin daidaiton filin maganadisu yana faruwa ne a cikin wani sarari na aunawa, kewayon canjin ƙarfin filin maganadisu a cikin sararin da aka bayar (ƙimar ppm), wato, miliyan ɗaya cikin ɗaya na babban ƙarfin filin maganadisu (ppm) a matsayin naúrar karkacewa don bayyanawa ta adadi, yawanci ana kiran wannan naúrar karkacewa ppm, wanda ake kira wakilcin ƙimar da ta dace. Misali, daidaiton filin maganadisu a cikin dukkan silinda buɗewa ta duba dubawa shine 5ppm; Daidaiton filin maganadisu a cikin sararin ƙwallo na 40cm da 50cm tare da cibiyar maganadisu shine 1ppm da 2ppm, bi da bi. Hakanan ana iya bayyana shi azaman: daidaiton filin maganadisu a cikin sararin kube na kowane santimita cubic a cikin yankin samfurin da ake gwadawa shine 0.01ppm. Ko da kuwa mizani ne, a ƙarƙashin ra'ayin cewa girman yankin aunawa iri ɗaya ne, ƙaramin ƙimar ppm yana nuna cewa daidaiton filin maganadisu ya fi kyau.

A yanayin na'urar 1.5-tMRI, canjin ƙarfin filin maganadisu wanda aka wakilta ta hanyar raka'a ɗaya ta karkacewa (1ppm) shine 1.5 × 10-6T. A wata ma'anar, a cikin tsarin 1.5T, daidaiton filin maganadisu na 1ppm yana nufin cewa babban filin maganadisu yana da canjin karkacewa na 1.5 × 10-6T (0.0015mT) bisa ga asalin ƙarfin filin maganadisu na 1.5T. Babu shakka, a cikin kayan aikin MRI masu ƙarfin filin daban-daban, bambancin ƙarfin filin maganadisu da kowace naúrar karkacewa ko ppm ke wakilta ya bambanta, daga wannan ra'ayi, ƙananan tsarin filin na iya samun ƙananan buƙatu don daidaiton filin maganadisu (duba Tebur 3-1). Tare da irin wannan tanadi, mutane za su iya amfani da ma'aunin daidaito don kwatanta tsarin da ƙarfin filin daban-daban, ko tsarin daban-daban masu ƙarfin filin iri ɗaya, don kimanta aikin maganadisu cikin gaskiya.

Kafin a auna ainihin daidaiton filin maganadisu, ya zama dole a tantance daidai tsakiyar maganadisu, sannan a shirya na'urar auna ƙarfin filin (mita Gauss) a kan sararin samaniya na wani radius, sannan a auna ƙarfin filin maganadisu a maki bayan maki (hanyar jirgin sama 24, hanyar jirgin sama 12), sannan a ƙarshe a sarrafa bayanan don ƙididdige daidaiton filin maganadisu a cikin dukkan girman.

Daidaiton filin maganadisu zai canza tare da yanayin da ke kewaye. Ko da maganadisu ya kai wani matsayi (ƙimar da aka tabbatar da masana'anta) kafin ya bar masana'antar, Duk da haka, bayan shigarwa, saboda tasirin abubuwan muhalli kamar kariyar maganadisu (kai), kariyar RF (ƙofofi da tagogi), farantin jagorar raƙuman ruwa (bututu), tsarin ƙarfe tsakanin maganadisu da tallafi, kayan ado na ado, kayan aikin haske, bututun iska, bututun wuta, fanfunan shaye-shaye na gaggawa, kayan aikin hannu (har ma da motoci, lif) kusa da gine-gine na sama da ƙasa, daidaiton sa zai canza. Saboda haka, ko daidaiton ya cika buƙatun hoton maganadisu ya kamata ya dogara ne akan ainihin sakamakon aunawa a lokacin karɓa na ƙarshe. Daidaiton filin da ba a iya amfani da shi ba da kuma daidaita filin aiki na na'urar superconductor coil da injiniyan shigarwa na masana'antar maganadisu ke yi a masana'anta ko asibiti su ne manyan matakan inganta daidaiton filin maganadisu.

Domin a gano siginar da aka tattara a sarari a cikin tsarin duba bayanai, kayan aikin MRI suma suna buƙatar a ɗora filin maganadisu mai girman △B tare da ci gaba da canje-canje masu yawa bisa ga babban filin maganadisu B0. Ana iya tunanin cewa filin gradient △B da aka ɗora akan voxel guda ɗaya dole ne ya fi girman karkacewar filin maganadisu ko canjin draft wanda babban filin maganadisu B0 ya haifar, in ba haka ba zai canza ko ma ya lalata siginar matsayi na sarari da ke sama, wanda ke haifar da kayan tarihi da rage ingancin hoto.

Girman karkacewa da canjin yanayin filin maganadisu da babban filin maganadisu B0 ke haifarwa, mafi muni da daidaiton filin maganadisu, ƙarancin ingancin hoto, da kuma alaƙa kai tsaye da jerin matsewar lipid (bambancin mitar amsawa tsakanin ruwa da kitse a jikin ɗan adam shine 200Hz kawai) da kuma nasarar duba magnetic resonance spectroscopy (MRS). Saboda haka, daidaiton filin maganadisu yana ɗaya daga cikin mahimman alamun auna aikin kayan aikin MRI.

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Injin watsa labarai mai matsin lamba mai yawas kuma kayan aiki ne masu matuƙar muhimmanci a fannin daukar hoton likita kuma ana amfani da su sosai don taimakawa ma'aikatan lafiya wajen isar da kayan aikin bambanci ga marasa lafiya. LnkMed kamfani ne da ke Shenzhen wanda ya ƙware wajen ƙera wannan kayan aikin likita. Tun daga shekarar 2018, ƙungiyar fasaha ta kamfanin ta mayar da hankali kan bincike da samar da allurar maganin bambanci mai ƙarfi. Shugaban ƙungiyar likita ne wanda ke da ƙwarewar bincike da ci gaba sama da shekaru goma. Waɗannan kyawawan abubuwan da aka fahimta naCT allurar guda ɗaya,CT mai allurar kai biyu,Injin MRIkumaMaganin allurar angiography mai matsin lamba(Injin DSA) wanda LnkMed ya samar kuma yana tabbatar da ƙwarewar ƙungiyar fasaha - an sayar da ƙira mai sauƙi da dacewa, kayan aiki masu ƙarfi, Perfect mai aiki, da sauransu ga manyan asibitoci na cikin gida da kasuwannin ƙasashen waje.