Ikhoyili yeGradient ye-MRI
Ohlelweni lokuskena lwe-MRI, umsebenzi wekhoyili yegradient ikakhulukazi ukubona umbhalo wekhodi wendawo. Lapho uskena isithombe, amakhoyili e-X, Y, kanye no-Z endlela-ntathu yegradient asebenza ndawonye ukuze enze ukukhetha kocezu, ukufaka ikhodi yemvamisa kanye nombhalo wekhodi wesigaba ngokulandelanayo. Lapho i-current idlula kulawa makhoyili kwakheka inkambu kazibuthe yesibili. Le nkambu yegradient ihlanekezela kancane inkambu kazibuthe eyinhloko kuphethini ebikezelwayo, okubangela ukuthi imvamisa yokuzwakala kwama-proton ihluke njengomsebenzi wokuma. Umsebenzi oyinhloko wama-gradient, ngakho-ke, ukuvumela ukubhala ngekhodi kwendawo kwesiginali ye-MR. Amakhoyili egrediyenti nawo abalulekile ezinhlobonhlobo zezindlela "ze-physiologic", njenge-MR angiography, i-diffusion, ne-perfusion imaging.
Ngasikhathi sinye, ikhoyili ye-gradient nayo inesibopho somsebenzi wokucwebezela kanye ne-anti-eddy yamanje.
Inkampani yethu ihlinzeka ngamakhoyili egradient ayisicaba asebenza kahle, angahlangabezana nezidingo zokusetshenziswa.
Ngokombono wesakhiwo, le gradient yephaneli eyisicaba inamakhoyili egradient u-X, Y, Z wezindlela ezintathu, kulula ukuxhuma, futhi ingahlonyiswa ngesistimu yokupholisa amanzi, engapholisa ngempumelelo ikhoyili yegradient futhi yenze isithombe. uzinzile;
Ingase futhi iklanywe njengekhoyili yegradient evikelekile ukuze iqhubeke nokunciphisa i-eddy current emthonjeni. Ngoba indlela ephumelela kakhulu yokulawula imisinga ye-eddy ukuvimbela ukukhiqizwa kwama-eddy currents kuqala. Lesi yisisusa sokuthuthukisa ama-gradients asebenzayo okuzivikela (ukuzivikela); i-current in the shielding coil isetshenziselwa ukugijima ibheke ohlangothini oluphambene nekhoyili ye-imaging gradient ukunciphisa ama-eddy currents. Ikhoyili ye-gradient eyenziwe ngale ndlela ithembekile futhi ihlala isikhathi eside.
1. Amandla egradient: 25mT/m
2. I-Gradient linearity: <5%
3. Isikhathi sokukhuphuka: ≥0.3ms
4. Izinga lokushintsha: ≥80mT/m/ms
Usayizi kungenziwa egcizelele ngokuvumelana nezidingo ikhasimende