7T MRI 系统的 32 通道并行发射系统附加组件
A 32-channel parallel transmit system add-on for 7T MRI.
机构信息
Erwin L. Hahn Institute for MRI, University of Duisburg-Essen, Essen, Germany.
RF & Microwave Technology, University of Duisburg-Essen, Duisburg, Germany.
出版信息
PLoS One. 2019 Sep 12;14(9):e0222452. doi: 10.1371/journal.pone.0222452. eCollection 2019.
PURPOSE
A 32-channel parallel transmit (pTx) add-on for 7 Tesla whole-body imaging is presented. First results are shown for phantom and in-vivo imaging.
METHODS
The add-on system consists of a large number of hardware components, including modulators, amplifiers, SAR supervision, peripheral devices, a control computer, and an integrated 32-channel transmit/receive body array. B1+ maps in a phantom as well as B1+ maps and structural images in large volunteers are acquired to demonstrate the functionality of the system. EM simulations are used to ensure safe operation.
RESULTS
Good agreement between simulation and experiment is shown. Phantom and in-vivo acquisitions show a field of view of up to 50 cm in z-direction. Selective excitation with 100 kHz sampling rate is possible. The add-on system does not affect the quality of the original single-channel system.
CONCLUSION
The presented 32-channel parallel transmit system shows promising performance for ultra-high field whole-body imaging.
目的
本文介绍了一种用于 7T 全身成像的 32 通道并行发射（pTx）附加系统。本文首先展示了该系统在体模和活体成像中的初步结果。
方法
该附加系统由大量硬件组件组成，包括调制器、放大器、SAR 监控、外围设备、控制计算机和集成的 32 通道发射/接收体阵列。本文通过采集体模中的 B1+图以及大志愿者中的 B1+图和结构图像，证明了该系统的功能。本文还使用 EM 模拟来确保安全运行。
结果
模拟和实验之间显示出良好的一致性。体模和活体采集显示出高达 50cm 的 z 方向视野。可以实现 100kHz 采样率的选择性激发。附加系统不会影响原始单通道系统的质量。
结论
本文提出的 32 通道并行发射系统在超高场全身成像中表现出了有前景的性能。
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