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 yanki na aunawa, canjin yanayin ƙarfin filin maganadisu a cikin sararin da aka bayar (ƙimar ppm), wato, miliyan ɗaya na babban ƙarfin filin maganadisu (ppm) a matsayin naúrar karkata don bayyana ƙididdigewa, yawanci wannan naúrar karkatacciyar ana kiranta ppm, wacce ake kira cikakken wakilcin ƙima. 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. Ba tare da la'akari da ma'auni ba, a 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 ƙarfin filin maganadisu wanda aka wakilta ta kowane yanki na ɓarna 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 daidai tsakiyar magnet ɗin, sannan a tsara kayan aikin auna ƙarfin filin (Gauss meter) akan sararin sarari na wani radius, sannan a auna ƙarfin filin maganadisu. point by point (hanyar jirgin sama 24, hanyar jirgin sama 12), sannan a ƙarshe sarrafa bayanai don ƙididdige daidaiton filin maganadisu a cikin duka girma.
Daidaitaccen filin maganadisu zai canza tare da yanayin kewaye. Ko da maganadisu ya kai wani ma'auni (ƙimar da masana'anta ta tabbatar) kafin barin masana'anta, Koyaya, bayan shigarwa, saboda tasirin abubuwan muhalli kamar garkuwar magnetic (kai-), garkuwar RF (ƙofofi da Windows), farantin waveguide. (tube), tsarin karfe tsakanin maganadisu da goyan baya, kayan ado na ado, kayan aikin hasken wuta, bututun samun iska, bututun wuta, magoya bayan shaye-shaye na gaggawa, kayan aikin hannu (har da motoci, lif) kusa da gine-ginen sama da 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 ɗora akan voxel guda ɗaya dole ne ya zama mafi girma fiye da karkatar da filin maganadisu ko jujjuyawar da babban filin maganadisu B0 ya haifar, in ba haka ba zai canza ko ma ya lalata siginar matsayi na sama, wanda ke haifar da kayan tarihi da kayan tarihi. rage ingancin hoto.
Mafi girman karkacewa da jujjuyawar filin maganadisu da babban filin maganadisu B0 ya haifar, mafi muni da daidaituwar filin maganadisu, ƙarancin ingancin hoton, da ƙarin alaƙa kai tsaye da jerin matsawa na lipid (bambancin mitar magana a tsakanin. ruwa da kitse a cikin jikin mutum shine kawai 200Hz) da kuma nasarar binciken magnetic resonance spectroscopy (MRS). Sabili da haka, daidaiton filin maganadisu ɗaya ne daga cikin mahimman alamomi don auna aikin kayan aikin MRI.
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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 ƙwarewar ƙungiyarmu ta fasaha - ƙira mai sauƙi da dacewa, kayan aiki masu ƙarfi, Perfect aiki, da dai sauransu, an sayar da su zuwa manyan asibitocin gida da kasuwanni na waje.
Lokacin aikawa: Maris 28-2024
