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Gradient Coil no MRI

Hōʻike Pōkole:

Hiki ke hoʻonohonoho pono ʻia ka nui e like me nā koi o nā mea kūʻai.


  • Ka ikaika o ka māla gradient:

    25mT / m

  • Ka laina linear:

    5%

  • Ala manawa:

    ≥0.3ms

  • Ka hoʻololi ʻana:

    ≥80mT / m / ms

  • ʻIke kikoʻī

    Nā huahana huahana

    Hoʻolauna Huahana

    I ka ʻōnaehana scanna MRI, ʻo ka hana o ka ʻōwili gradient e ʻike pinepine i ka encode spatial. Ke nānā pono ʻana i ke kiʻi, hana pū nā koloka X, Y, a me Z kolu ala ʻekolu e hana i kahi koho slice, encoding frequency a me ka pae encoding. Ke hala nei kēia i loko o kēia mau ʻōwili e hana ʻia kahi māpala magnetika lua. Hoʻololi iki kēia kahua gradient i ka māla nui magnet i kahi hiʻohiʻona i wānana ʻia, e hoʻololi ana i nā alapine resonance o nā protons i kahi ʻano o ke kūlana. ʻO ka hana mua o nā gradients, no laila e ʻae i ka encoding spatial o ka hōʻailona MR. Kūleʻa hoʻi nā ʻōwili gradient no ka laulā o nā hana "physiologic", e like me MR angiography, diffusion, a me perfaging imaging.

    I ka manawa like, kuleana pū ka ʻōwili gradient no ka hana o ke aniani a me ke au anti-eddy

    Hāʻawi kā mākou ʻoihana i nā ʻōwili gradient pā pālahalaha me ka hana maikaʻi, hiki ke hoʻokō i nā pono o ka hoʻohana.

    Mai kahi ʻano o ka hiʻona, he gradient gradient X, Y, Z ʻekolu ala o kēia gradient, maʻalahi e hoʻohui, a hiki ke hoʻolako ʻia me kahi ʻōnaehana hōʻoluʻolu wai, hiki ke hoʻomaʻalili pono i ka ʻōwili gradient a hana i ke kiʻi. ʻoi aku ke kūpaʻa;

    Hiki iā ia ke hoʻolālā ʻia e like me kahi ʻōwili gradient pale pale e hōʻemi hou i ke au o eddy mai ke kumu. No ka mea ʻo ke ala kūpono e kaohi ai i nā kahe o ka mea e pale ai i ka hanauna o nā wai i ka mua. ʻO kēia ka hoʻoikaika e hoʻomohala i nā gradients pale pale (pale pale pilikino); hoʻohana ʻia ke au i ka pale pale e holo i ka ʻaoʻao ʻē aʻe i ka ʻōwili gradient kiʻi e hoʻoliʻiliʻi i nā kahe eddy. ʻO ka ʻōwili gradient i hana ʻia i kēia ala he hilinaʻi a paʻa.

    Nā Palapala Loea

    1. ikaika Gradient: 25mT / m

    2. Gradient linearity: <5%

    3. Wā piʻi: ≥0.3ms

    4. Ka helu hoʻololi: ≥80mT / m / ms

    Hiki ke hoʻonohonoho pono ʻia ka nui e like me nā koi o nā mea kūʻai


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