Interventional MRI: tapering improves the distal sensitivity of the loopless antenna.

Interventional MRI: tapering improves the distal sensitivity of the loopless antenna.
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DOI:
10.1002/mrm.22152
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发表时间:
2010-03
影响因子:
3.3
通讯作者:
Bottomley, Paul A.
Bottomley, Paul A.
中科院分区:
医学3区
文献类型:
--
作者:
Qian, Di;El-Sharkawy, AbdEl-Monem M.;Atalar, Ergin;Bottomley, Paul A.

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方法无环天线由直径2.2 mm的UT-85-C电缆组成,内芯鞭形0.5 mm,电缆介质ε=2.2。两个天线的鞭子用ε=3聚乙烯热收缩管绝缘:一个有标准的均匀厚0.5 mm的层,另一个在结合处有1 mm的锥形层,从结合处的1 mm线性递减到尖端的0.025 mm。第三个是没有绝缘的。样品为0.35%的模拟生物盐水模体,电导率σ=0.63 S/m,ε=80。
MethodsThe loopless antennae are formed from 2.2 mm diameter UT-85-C cable with an 0.5 mm inner conductor whip, and cable dielectric ε= 2.2. The whips of two antennae are insulated with ε= 3 polyethylene (PET) heat-shrink tubing: one with a standard uniformly thick 0.5 mm layer, the other with a tapered layer of 1mm at the junction decreasing linearly from 1mm at the junction to 0.025 mm at the tip. The third is left un-insulated. The sample is a 0.35% bio-analogous saline phantom with conductivity σ= 0.63 S/m and ε= 80.
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