Gradient Coil mo MRI
I le MRI scan system, o le galuega a le gradient coil e masani lava ona iloa ai le faʻaogaina o avanoa. Pe a su'esu'e le ata, e galulue fa'atasi le X, Y, ma le Z e fa'atino le filifiliga o fasi, fa'asologa o taimi ma fa'asologa o vaega. A o'o atu le vai i totonu o nei u'amea, e maua ai se maneta lona lua. O lenei fanua fa'alili'i e fa'asese teisi le maneta autu i se mamanu e mafai ona va'aia, ma mafua ai ona fesuisuia'i le fa'agasolo o protons i se galuega o le tulaga. Ole galuega autu ole gradients, ole mea lea, ole fa'ataga ole fa'ailoga avanoa ole fa'ailoga MR. E taua tele fo'i fa'asologa o le gradient mo le tele o metotia "physiologic", e pei o le MR angiography, fa'asalalauga, ma fa'ata'ita'iga.
I le taimi lava e tasi, o le gradient coil e nafa foi ma le gaioiga o le shimming ma le anti-eddy current
O loʻo tuʻuina atu e la matou kamupani faʻapipiʻi faʻapipiʻi gradient mafolafola ma faʻatinoga lelei, lea e mafai ona fetaui ma manaʻoga o le faʻaaogaina.
Mai se vaaiga faʻavae, o lenei faʻamaʻa faʻapipiʻi faʻapipiʻi o loʻo i ai X, Y, Z tolu-ala gradient coils, faigofie ona faʻafesoʻotaʻi, ma e mafai ona faʻapipiʻiina i se vai malulu, lea e mafai ona faʻamalieina lelei le gradient coil ma faia le ata. sili atu le mautu;
E mafai fo'i ona fa'atulagaina e avea o se vili fa'asa'o fa'asa'o malosi e fa'aitiitia ai le fa'apogai mai le puna. Aua o le auala pito sili ona aoga e pulea ai le eddy currents o le puipuia lea o le faʻatupuina o galu eddy muamua. O le fa'aosofiaga lea e atia'e le fa'amalosi malosi (self-shielding) gradients; o le taimi nei o loʻo i totonu o le talipupuni o loʻo faʻaaogaina e tamoe i le itu faʻafeagai i le faʻataʻitaʻiga gradient coil e faʻaitiitia ai galu eddy. O le gradient coil na faia i lenei auala e faʻatuatuaina ma tumau.
1. Malosi fa'asolosolo: 25mT/m
2. Fa'asologa fa'asolosolo: <5%
3. Taimi tula'i: ≥0.3ms
4. Suiga fua faatatau: ≥80mT/m/ms
O le tele e mafai ona faʻatulagaina e tusa ai ma manaʻoga o tagata faʻatau