Double Tuned 1H-23Na Birdcage Coils for MRI at 7 T : Performance evaluation through electromagnetic simulations

... IEEE International Symposium on Medical Measurements and Applications : proceedings. IEEE International Symposium on Medical Measurements and Applications Pub Date : 2018-06-11 DOI:10.1109/MeMeA.2018.8438777

Francesca Maggiorelli, A. Retico, E. Boskamp, F. Robb, A. Galante, M. Fantasia, M. Alecci, M. Tosetti, G. Tiberi

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引用次数: 2

Abstract

The aim of the present study is the electromagnetic evaluation of a ‘four-ring’ double-tuned (DT) birdcage coil designed for head imaging. The model consists of an inner Low-Pass (LP) birdcage coil and two externally nested High-Pass (HP) birdcage-like coils. LP and HP structures are tuned at the 23Na and 1H Larmor frequency at 7 T, respectively. Dimensional parameters are varied in order to optimize the radio frequency (RF) B 1 + field homogeneity at both Larmor frequencies. Results show that B 1 + field homogeneity at the 1H Larmor frequency can be considerably increased by optimizing the mutual distance between the inner and outer coil structure length. This result is particularly significant in case of MRI at 7 T, to correct for the ‘intrinsically’ inhomogeneous B 1 + field due to the short wavelength.

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双调谐1H-23Na鸟笼线圈在7 T MRI:性能评估通过电磁模拟

本研究的目的是对用于头部成像的“四环”双调谐(DT)鸟笼线圈进行电磁评估。该模型由一个内部低通(LP)鸟笼线圈和两个外部嵌套的高通(HP)鸟笼线圈组成。在7 T时，LP和HP结构分别在23Na和1H拉莫尔频率下调谐。为了优化两个拉莫尔频率下的射频b1 +场均匀性，改变了尺寸参数。结果表明，通过优化内外线圈结构长度之间的相互距离，可以显著提高1H Larmor频率下的b1 +场均匀性。这个结果在7 T的MRI情况下特别重要，以纠正由于短波长的“本质上”不均匀的b1 +场。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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... IEEE International Symposium on Medical Measurements and Applications : proceedings. IEEE International Symposium on Medical Measurements and Applications

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