A radially interleaved sodium and proton coil array for brain MRI at 7 T,NMR in Biomedicine

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A radially interleaved sodium and proton coil array for brain MRI at 7 T
NMR in Biomedicine ( IF 2.7 ) Pub Date : 2021-09-03 , DOI: 10.1002/nbm.4608
Bili Wang _{1,

2} , Bei Zhang _{1,

2,

3} , Zidan Yu _{1,

2,

4} , Carlotta Ianniello _{1,

2,

4} , Karthik Lakshmanan _{1,

2} , Jan Paska _{1,

2} , Guillaume Madelin _{1,

4} , Martijn Cloos _{1,

2,

4,

5} , Ryan Brown _{1,

2,

4}

Affiliation

The objective of the current study was to design and build a dual-tuned coil array for simultaneous ²³Na/¹H MRI of the human brain at 7 T. Quality factor, experimental B₁⁺ measurements, and electromagnetic simulations in prototypes showed that setups consisting of geometrically interleaved ¹H and ²³Na loops performed better than or similar to ¹H or ²³Na loops in isolation. Based on these preliminary findings, we built a transmit/receive eight-channel ²³Na loop array that was geometrically interleaved with a transmit/receive eight-channel ¹H loop array. We assessed the performance of the manufactured array with mononuclear signal-to-noise ratio (SNR) and B₁⁺ measurements, along with multinuclear magnetic resonance fingerprinting maps and images. The ²³Na array within the developed dual-tuned device provided more than 50% gain in peripheral SNR and similar B₁⁺ uniformity and coverage as a reference birdcage coil of similar size. The ¹H array provided good B₁⁺ uniformity in the brain, excluding the cerebellum and brain stem. The integrated ²³Na and ¹H arrays were used to demonstrate truly simultaneous quantitative ¹H mapping and ²³Na imaging.

中文翻译：

用于 7 T 脑 MRI 的径向交错钠质子线圈阵列

当前研究的目标是设计和构建一个双调谐线圈阵列，用于在 7 T 条件下同时对人脑进行²³ Na/ ^{1 H MRI。品质因数、实验 B}₁⁺测量和原型中的电磁模拟表明，设置由几何交错的¹ H 和²³ Na 环组成，性能优于或类似于孤立的¹ H 或²³ Na 环。基于这些初步发现，我们构建了一个发射/接收八通道²³ Na 环路阵列，该阵列与发射/接收八通道^{1几何交错}H循环数组。我们通过单核信噪比 (SNR) 和 B ₁⁺测量以及多核磁共振指纹图和图像评估了制造阵列的性能。开发的双调谐设备中的²³ Na 阵列提供了超过 50% 的外围 SNR 增益和与类似尺寸的参考鸟笼线圈类似的 B ₁⁺均匀性和覆盖范围。¹ H 阵列在大脑中提供了良好的 B 1 ₊^均匀性，不包括小脑和脑干。集成的²³ Na 和¹ H 阵列用于演示真正同步的定量¹ H 映射和²³钠成像。

更新日期：2021-09-03

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