Double-crossed radiofrequency coil with improved uniformity for rodent MRI at 7 T

IF 2.624
O. Marrufo , F. Vazquez , R. Martin , A.O. Rodriguez , S.E. Solis-Najera
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Abstract

A transceiver volume coil for High Field Magnetic Resonance Imaging was developed based on Temnikov’s NMR probe coil. The critical advantage of this design is that requires only one trimmer capacitor for both tuning and matching. Electromagnetic simulations of our coil were compared to a four-rung birdcage coil to evaluate their performances. A transceiver coil prototype, called the double-cross coil and a birdcage coil were built to compare and contrast their feasibility. Both coil prototypes were operated in the linear mode. Experimental quality factors were Qu/Ql=101/45 for the double-cross coil and Qu/Ql=105/43 for the birdcage coil. Phantom images were acquired to test the viability of each coil for high field magnetic resonance imaging applications. The signal-to-noise ratios, noise factors and uniformity values were also calculated: 85.26/0.74/44.48 for the double-cross coil and 76.54/1.9/65.65 for the birdcage coil. These volume coils showed similar performance, but the double-cross coil has better uniformity and a slightly lower noise figure than the birdcage coil. A remarkable agreement of experimental and simulated B1 was obtained for the double-cross coil. These experimental and numerical results demonstrate the feasibility of the double-cross volume coil with better uniformity for rodent magnetic resonance imaging at 7 T.

Abstract Image

双交叉射频线圈与改善均匀性在7 T啮齿动物MRI
在捷姆尼科夫核磁共振探针线圈的基础上,研制了一种用于高场磁共振成像的收发体积线圈。这种设计的关键优点是只需要一个微调电容器进行调谐和匹配。将我们的线圈的电磁仿真与四阶鸟笼线圈进行了比较,以评估其性能。一个收发器线圈的原型,称为双交叉线圈和一个鸟笼线圈,以比较和对比他们的可行性。两个线圈原型都在线性模式下运行。双交叉线圈的实验质量因子为Qu/Ql=101/45,鸟笼线圈的实验质量因子为Qu/Ql=105/43。获得幻像以测试每个线圈在高场磁共振成像应用中的可行性。计算结果表明:双交叉线圈的信噪比为85.26/0.74/44.48,鸟笼线圈的信噪比为76.54/1.9/65.65。这些体积线圈表现出类似的性能,但双交叉线圈具有更好的均匀性和稍低的噪声系数比鸟笼线圈。双交叉线圈的实验值与模拟值具有显著的一致性。实验和数值结果表明,采用均匀性较好的双交叉体积线圈在7 T下进行啮齿动物磁共振成像是可行的。
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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CiteScore
1.90
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