Wiggins G C, Triantafyllou C, Potthast A, Reykowski A, Nittka M, Wald L L
Department of Radiology, A.A. Martinos Center for Biomedical Imaging, Massachusetts General Hospital, Charlestown, Massachusetts 02129, USA.
Magn Reson Med. 2006 Jul;56(1):216-23. doi: 10.1002/mrm.20925.
A 32-channel 3T receive-only phased-array head coil was developed for human brain imaging. The helmet-shaped array was designed to closely fit the head with individual overlapping circular elements arranged in patterns of hexagonal and pentagonal symmetry similar to that of a soccer ball. The signal-to-noise ratio (SNR) and noise amplification (g-factor) in accelerated imaging applications were quantitatively evaluated in phantom and human images and compared with commercially available head coils. The 32-channel coil showed SNR gains of up to 3.5-fold in the cortex and 1.4-fold in the corpus callosum compared to a (larger) commercial eight-channel head coil. The experimentally measured g-factor performance of the helmet array showed significant improvement compared to the eight-channel array (peak g-factor 59% and 26% of the eight-channel values for four- and fivefold acceleration). The performance of the arrays is demonstrated in high-resolution and highly accelerated brain images.
为进行人脑成像，研发了一种32通道3T仅接收相控阵头部线圈。头盔形状的阵列设计为紧密贴合头部，其单个重叠圆形元件以类似于足球的六边形和五边形对称模式排列。在体模和人体图像中对加速成像应用中的信噪比（SNR）和噪声放大（g因子）进行了定量评估，并与市售头部线圈进行了比较。与（更大的）商用八通道头部线圈相比，32通道线圈在皮质中的SNR增益高达3.5倍，在胼胝体中为1.4倍。头盔阵列的实验测量g因子性能与八通道阵列相比有显著改善（四倍和五倍加速时，峰值g因子分别为八通道值的59%和26%）。在高分辨率和高度加速的脑部图像中展示了这些阵列的性能。
