Department of Radiology, UMC, Utrecht, The Netherlands.
Magn Reson Med. 2013 Apr;69(4):1186-93. doi: 10.1002/mrm.24345. Epub 2012 Jul 3.
A setup for 7T MRI of the carotid arteries in the neck was designed and constructed. Separate dedicated arrays were used for transmit and receive. For the transmit array, single-side adapted dipole antennas were mounted on a dielectric pillow, which was shown to serve as a leaky waveguide, efficiently distributing B1 into the neck. Risk assessment was performed by simulations. Phantom measurements were performed to establish optimal positions of the antennas on the pillow. Using two antennas, a dual transmit setup was created. In vivo B1 (+) maps with different shim configurations were acquired to assess transmit performance. This effective transmit array was used in combination with a dedicated 30 channel small element receive coil. High-resolution in vivo turbo spin echo images were acquired to demonstrate the excellent performance of the setup.
设计并构建了用于颈部颈动脉 7T MRI 的设置。分别使用专用的阵列进行发射和接收。对于发射阵列，将单侧边适应偶极天线安装在介电枕上，该介电枕被证明可以作为泄漏波导，有效地将 B1 分布到颈部。通过模拟进行风险评估。进行了幻影测量以确定天线在枕头上的最佳位置。使用两个天线，创建了双发射设置。采集了具有不同匀场配置的体内 B1(+)图以评估发射性能。该有效发射阵列与专用的 30 通道小单元接收线圈结合使用。采集了高分辨率的体内涡轮自旋回波图像，以展示设置的优异性能。
