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用于灵敏度编码成像的简并模式鸟笼容积线圈。

Degenerate mode birdcage volume coil for sensitivity-encoded imaging.

作者信息

Lin Fa-Hsuan, Kwong Kenneth K, Huang Ing-Jye, Belliveau John W, Wald Lawrence L

机构信息

Havard-MIT Division of Health Sciences and Technology, Boston, Massachusetts 02129, USA.

出版信息

Magn Reson Med. 2003 Nov;50(5):1107-11. doi: 10.1002/mrm.10632.

Abstract

A volume birdcage coil for accelerated image encoding with parallel acquisition methods such as SENSE is demonstrated. The coil is degenerately tuned with both the standard homogeneous mode and the first gradient mode of the birdcage coil resonant at the Larmor frequency. Conventional and antisymmetric coupling structures allow imaging from each of these modes simultaneously. The coil for SENSE-type reconstruction with acceleration factors of up to 2-fold is demonstrated. The spatial distribution of the added noise from the SENSE reconstruction (g-factor map) due to geometrical arrangement of the two-channel system is estimated. The spatially averaged g-factors were found to be 1.21, 1.36, and 1.55 for 1.3, 1.6, and 2-fold accelerations, respectively. The system was demonstrated in vivo using accelerated and nonaccelerated anatomical brain images at 1.5 T. The maximal 2-fold acceleration in this dual-mode degenerate birdcage coil offers the potential to extend SENSE-type image reconstruction methods to applications demanding uniform whole brain coverage.

摘要

展示了一种用于通过诸如SENSE等并行采集方法进行加速图像编码的容积鸟笼线圈。该线圈在拉莫尔频率下与鸟笼线圈的标准均匀模式和第一梯度模式进行简并调谐。传统和反对称耦合结构允许同时从这些模式中的每一种进行成像。展示了用于加速因子高达2倍的SENSE型重建的线圈。估计了由于双通道系统的几何排列导致的SENSE重建(g因子图)中附加噪声的空间分布。对于1.3倍、1.6倍和2倍加速,空间平均g因子分别为1.21、1.36和1.55。该系统在1.5 T下使用加速和未加速的解剖学脑图像在体内进行了演示。这种双模简并鸟笼线圈中的最大2倍加速为将SENSE型图像重建方法扩展到需要均匀全脑覆盖的应用提供了潜力。

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