Transmit and receive transmission line arrays for 7 tesla parallel imaging
Transmit and receive transmission line arrays for 7 tesla parallel imaging
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DOI：
10.1002/mrm.20321
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发表时间：
2005-02-01
影响因子：
3.3
通讯作者：
Ugurbil, K
中科院分区：
文献类型：
--
作者：
Adriany, G;Van de Moortele, PF;Ugurbil, K
收发器阵列线圈，能够射频传输和独立的信号接收，开发用于并行，H-1成像应用在人的头部在7 T （300 MHz）。该线圈结合了传输线高频特性和经典磁流变线圈设计的优点。由于在300 MHz的H-1频率上的短波长，这些线圈很容易构建和去耦。单个线圈的灵敏度曲线是高度不对称的，正如预期的在这个高频率；然而，所有线圈的图像总和在整个大脑中相对均匀。数据是通过环形配置的四通道和八通道收发器阵列获得的，并与直接带状传输线阵列进行了比较。使用四通道和八通道阵列，在人体头部7 T处进行高还原数的灵敏度编码并行成像是可行的，使用八通道发射/接收线圈可以稳健地实现一维还原因子4，平均g值为1.25。(C) 2004 Wiley-Liss, Inc。
Transceive array coils, capable of RF transmission and inde pendent signal reception, were developed for parallel, H-1 imaging applications in the human head at 7 T (300 MHz). The coil combine the advantages of high-frequency properties of transmission lines with classic MR coil design. Because of the short wavelength at the H-1 frequency at 300 MHz, these coils were straightforward to build and decouple. The sensitivity profiles of individual coils were highly asymmetric, as expected at this high frequency; however, the summed images from all coil were relatively uniform over the whole brain. Data were obtained with four- and eight-channel transceive arrays built using a loop configuration and compared to arrays built from straight stripline transmission lines. With both the four- and the eight channel arrays, parallel imaging with sensitivity encoding wit high reduction numbers was feasible at 7 T in the human head A one-dimensional reduction factor of 4 was robustly achieve with an average g value of 1.25 with the eight-channel transmit/receive coils. (C) 2004 Wiley-Liss, Inc.