Double-row 18-loop transceive 32-loop receive tight-fit array provides for whole-brain coverage, high transmit performance, and SNR improvement near the brain center at 9.4T
Double-row 18-loop transceive 32-loop receive tight-fit array provides for whole-brain coverage, high transmit performance, and SNR improvement near the brain center at 9.4T
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DOI：
10.1002/mrm.27602
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发表时间：
2019-05-01
影响因子：
3.3
通讯作者：
Henning, Anke
中科院分区：
文献类型：
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作者：
Avdievich, Nikolai I.;Giapitzakis, Ioannis-Angelos;Henning, Anke
用途：为了提高发射（Tx）和接收（Rx）的性能的人的头部阵列，并提供全脑覆盖率在9.4T，一种新的32元件阵列设计开发，构建，和tested.Methods：该阵列由18个收发器（TxRx）的表面回路和14个Rx的垂直回路都放置在一个单一的层。新设计结合了TxRx和仅发送-仅接收（ToRo）设计的优点。设计的总体思想是阵列元件（TxRx和Rx）的总数不应超过所需Rx元件的数量。首先，将必要数量的TxRx环路紧密地放置在对象周围以优化Tx性能。其余的元件是回路，仅用于接收。我们还将新阵列的性能与最先进的ToRo阵列的性能进行了比较，ToRo阵列由16个仅Tx环路和31个仅Rx环路组成。新阵列提供全脑覆盖，与ToRo阵列相比，Tx效率提高了1.5倍，大脑中心附近的SNR提高了1.3倍，而后者提供更高的（高达1.5倍）的外周SNR。总的来说，构造由TxRx-和Rx-组成的单层阵列的新方法仅元件通过使元件的总数最小化而简化了阵列结构，并且使整个设计更坚固，因此更安全。总的来说，我们的工作提供了一个处方的Tx和Rx高效的头部阵列线圈适用于并行传输和接收，以及在UHF全脑成像。
Purpose: To improve the transmit (Tx) and receive (Rx) performance of a human head array and provide whole-brain coverage at 9.4T, a novel 32-element array design was developed, constructed, and tested.Methods: The array consists of 18 transceiver (TxRx) surface loops and 14 Rx-only vertical loops all placed in a single layer. The new design combines benefits of both TxRx and transmit-only-receive-only (ToRo) designs. The general idea of the design is that the total number of array elements (both TxRx and Rx) should not exceed the number of required Rx elements. First, the necessary number of TxRx loops is placed around the object tightly to optimize the Tx performance. The rest of the elements are loops, which are used only for reception. We also compared the performance of the new array with that of a state-of-the-art ToRo array consisting of 16 Tx-only loops and 31 Rx-only loops.Results: The new array provides whole-brain coverage, similar to 1.5 times greater Tx efficiency and 1.3 times higher SNR near the brain center as compared to the ToRo array, while the latter delivers higher (up to 1.5 times) peripheral SNR.Conclusion: In general, the new approach of constructing a single-layer array consisting of both TxRx- and Rx-only elements simplifies the array construction by minimizing the total number of elements and makes the entire design more robust and, therefore, safe. Overall, our work provides a recipe for a Tx- and Rx-efficient head array coil suitable for parallel transmission and reception as well as whole-brain imaging at UHF.