de Zwart Jacco A, Ledden Patrick J, Kellman Peter, van Gelderen Peter, Duyn Jeff H
Advanced MRI, Laboratory of Functional and Molecular Imaging, NINDS, National Institutes of Health, Bethesda, Maryland 20892-1065, USA.
Magn Reson Med. 2002 Jun;47(6):1218-27. doi: 10.1002/mrm.10169.
An 8-channel receive-only detector array was developed for SENSE MRI of human brain. The coil geometry was based on a gapped element design and used ultra-high impedance preamplifiers for mutual decoupling of the elements. Computer simulations of the electric and magnetic fields showed that excellent signal-to-noise ratio (SNR) and SENSE performance could be achieved by placing the coil elements close to the head and maintaining a substantial gap between the elements. Measurements with a 1.5 T prototype coil showed a 2.7-fold improvement of the SNR averaged over the brain compared to a conventional quadrature birdcage receive coil and an average geometrical noise amplification factor (g-value) of 1.06 and 1.38 for rate-2 and rate-3 SENSE, respectively.
我们开发了一种8通道仅接收探测器阵列，用于人脑的敏感性磁共振成像（SENSE MRI）。线圈几何结构基于有间隙元件设计，并使用超高阻抗前置放大器实现元件间的相互去耦。电场和磁场的计算机模拟表明，通过将线圈元件靠近头部放置并在元件之间保持足够大的间隙，可以实现出色的信噪比（SNR）和SENSE性能。使用1.5 T原型线圈进行的测量表明，与传统的正交鸟笼式接收线圈相比，大脑平均SNR提高了2.7倍，对于速率为2和速率为3的SENSE，平均几何噪声放大因子（g值）分别为1.06和1.38。
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