Homogeneity na MRI

Daidaita yanayin filin maganadisu (homogeneity), wanda kuma aka sani da daidaiton filin maganadisu, yana nufin ainihin filin maganadisu a cikin ƙayyadadden ƙayyadaddun ƙara, wato, ko layukan maganadisu da ke fadin yankin naúrar iri ɗaya ne. Ƙararren ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙayyadaddun ƙira a nan yawanci sararin samaniya ne. Nau'in daidaiton filin maganadisu shine ppm (ban da miliyan ɗaya), 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 daidaitaccen filin maganadisu, wanda ke ƙayyade ƙudurin sararin samaniya da siginar-zuwa-amo na hoton a cikin kewayon hoto. Rashin daidaiton daidaitaccen filin maganadisu zai sa hoton ya ɓaci kuma ya ɓaci. Daidaitaccen filin maganadisu yana ƙaddara ta ƙirar magnet kanta da yanayin waje. Mafi girman wurin hoton maganadisu, ana iya samun daidaiton filin maganadisu ƙasa. Tsayayyen filin maganadisu shine fihirisa don auna ma'aunin fiɗawar ƙarfin filin maganadisu tare da lokaci. A cikin tsawon lokacin jerin hotuna, ƙwanƙwasa ƙarfin filin maganadisu zai shafi lokacin siginar maimaita ma'auni na echo, yana haifar da murɗawar hoto da raguwar sigina-zuwa amo. Zaman lafiyar filin maganadisu yana da alaƙa da alaƙa da nau'in maganadisu da ingancin ƙira.

Abubuwan da aka tanada na daidaitattun daidaiton filin maganadisu suna da alaƙa da girma da siffar sararin aunawa da aka ɗauka, kuma gabaɗaya suna amfani da sararin sararin samaniya tare da takamaiman diamita da tsakiyar maganadisu azaman kewayon ma'auni. Yawancin lokaci, wakilcin daidaiton filin maganadisu yana cikin yanayin wani sararin aunawa, canjin kewayon ƙarfin filin maganadisu a cikin sarari da aka bayar (ƙimar ppm), wato, miliyan ɗaya na babban ƙarfin filin maganadisu (ppm) a matsayin naúrar karkata zuwa ƙididdigewa, yawanci ana kiran wannan rukunin karkatar da ppm, wanda ake kira cikakken wakilcin ƙimar. Misali, daidaiton filin maganadisu a cikin dukkan silinda na duba buɗaɗɗen silinda shine 5ppm; Daidaitaccen filin maganadisu a cikin sararin sararin samaniya na 40cm da 50cm concentric tare da cibiyar maganadisu shine 1ppm da 2ppm, bi da bi. Hakanan za'a iya bayyana shi azaman: daidaiton filin maganadisu a cikin sararin kubu na kowane centimita mai siffar sukari a cikin yankin samfurin da ake gwadawa shine 0.01ppm. Ko da ma'auni, ƙarƙashin ma'aunin cewa girman girman yanki ɗaya ne, ƙaramar ƙimar ppm yana nuna mafi kyawun daidaiton filin maganadisu.

A cikin yanayin na'urar 1.5-tMRI, jujjuyawar jujjuyawar ƙarfin filin maganadisu wanda ke wakilta ta raka'a ɗaya na sabawa (1ppm) shine 1.5 × 10-6T. A wasu kalmomi, a cikin tsarin 1.5T, daidaiton filin maganadisu na 1ppm yana nufin cewa babban filin maganadisu yana da juzu'i na 1.5 × 10-6T (0.0015mT) dangane da bangon ƙarfin filin magnetic 1.5T. Babu shakka, a cikin kayan aikin MRI tare da ƙarfin filin daban-daban, bambancin girman filin maganadisu wanda aka wakilta ta kowace ƙungiya ta karkata ko ppm ya bambanta, daga wannan ra'ayi, ƙananan tsarin filin zai iya samun ƙananan buƙatu don daidaiton filin magnetic (duba Table 3-1). Tare da irin wannan tanadi, mutane za su iya amfani da daidaitattun daidaito don sauƙin kwatanta tsarin tare da ƙarfin filin daban-daban, ko tsarin daban-daban tare da ƙarfin filin iri ɗaya, don kimanta aikin maganadisu da gaske.

Kafin auna daidai daidaitaccen filin maganadisu, ya zama dole a tantance tsakiyar magnet daidai, sannan a tsara kayan aikin auna ƙarfin filin (Gauss meter) akan sararin sararin samaniya na wani radius, sannan a auna ƙarfin filin maganadisu da ma'ana (hanyar jirgin sama 24, hanyar jirgin sama 12), sannan a ƙarshe aiwatar da bayanan don ƙididdige daidaiton girman filin maganadisu gaba ɗaya.

Daidaitaccen filin maganadisu zai canza tare da yanayin kewaye. Ko da maganadisu ya kai wani ma'auni (ma'aikata garanti darajar) kafin barin ma'aikata, Duk da haka, bayan shigarwa, saboda da tasiri na muhalli dalilai kamar Magnetic (self-) garkuwa, RF garkuwa (kofofi da Windows), waveguide farantin (tube), karfe tsarin tsakanin maganadiso da kuma goyon bayan, kayan ado kayan ado, fitilu fitilu, samun iska bututu, wuta bututu, gaggawa shaye motoci up gaba daya fansho, statuess mota da kayan aiki na gaba. Gine-gine na ƙasa, daidaiton sa zai canza. Don haka, ko daidaiton ya dace da buƙatun hoton maganadisu na maganadisu ya kamata a dogara ne akan ainihin sakamakon ma'auni a lokacin karɓa na ƙarshe. Matsakaicin matakin filin wucewa da matakin matakin filin aiki na babban na'ura mai ƙarfi wanda injiniyan shigarwa na masana'anta na injin maganadisu a masana'anta ko asibiti sune mahimman matakan haɓaka daidaiton filin maganadisu.

Domin gano wuraren da aka tattara sigina a cikin tsarin dubawa, kayan aikin MRI kuma suna buƙatar ɗaukaka filin magnetic gradient △B tare da ci gaba da haɓaka canje-canje bisa tushen babban filin magnetic B0. Ana iya tunanin cewa filin gradient △B wanda aka ɗorawa akan voxel guda ɗaya dole ne ya fi karkatar da filin maganadisu ko jujjuyawar filaye da babban filin maganadisu B0 ya haifar, in ba haka ba zai canza ko ma ya lalata siginar matsayi na sama, yana haifar da kayan tarihi da rage ingancin hoto.

Mafi girman karkacewa da jujjuyawar filin maganadisu da babban filin maganadisu B0 ke haifarwa, mafi muni da daidaiton filin maganadisu, da ƙarancin ingancin hoton, da ƙarin alaƙa kai tsaye da jerin matsawa na lipid (bambancin mitar rawa tsakanin ruwa da mai a cikin jikin ɗan adam shine kawai 200Hz) da kuma nasarar gwajin maganadisu na maganadisu RS dubawa (M). Sabili da haka, daidaiton filin maganadisu ɗaya ne daga cikin mahimman alamomi don auna aikin kayan aikin MRI.

————————————————————————————————————————————————————————

Injector kafofin watsa labarai mai girma-matsis kuma kayan aikin taimako ne masu mahimmanci a fagen ɗaukar hoto na likita kuma ana amfani da su don taimakawa ma'aikatan kiwon lafiya isar da saɓanin kafofin watsa labarai ga marasa lafiya. LnkMed masana'anta ne a Shenzhen wanda ya ƙware wajen kera wannan kayan aikin likitanci. Tun daga 2018, ƙungiyar fasaha ta kamfanin tana mai da hankali kan bincike da kuma samar da injectors masu mahimmanci na matsa lamba. Jagoran ƙungiyar likita ne wanda ke da ƙwarewar R&D sama da shekaru goma. Wadannan kyawawan fahimtar naCT guda allura,CT biyu kai allura,MRI injectorkumaAngiography high matsa lamba injector(DSA injector) wanda LnkMed ya samar kuma ya tabbatar da ƙwararrun ƙungiyar fasahar mu - ƙirar ƙira da dacewa, ƙaƙƙarfan kayan aiki, Perfect aiki, da sauransu, an sayar da su zuwa manyan asibitocin gida da kasuwannin waje.