1 Department of Radiology and Biomedical Imaging, University of California San Francisco, San Francisco, CA, USA ; 2 Agilent Technologies, Santa Clara, CA, USA ; 3 Magwale, Palo Alto, CA, USA ; 4 UC Berkeley/UCSF Joint Graduate Group in Bioengineering, San Francisco & Berkeley, CA, USA ; 5 California Institute for Quantitative Biosciences (QB3), San Francisco, CA, USA.
Quant Imaging Med Surg. 2014 Feb;4(1):50-6. doi: 10.3978/j.issn.2223-4292.2014.02.07.
In this work, we propose and investigate a volume coil array design method using different types of birdcage coils for MR imaging. Unlike the conventional radiofrequency (RF) coil arrays of which the array elements are surface coils, the proposed volume coil array consists of a set of independent volume coils including a conventional birdcage coil, a transverse birdcage coil, and a helix birdcage coil. The magnetic fluxes of these three birdcage coils are intrinsically cancelled, yielding a highly decoupled volume coil array. In contrast to conventional non-array type volume coils, the volume coil array would be beneficial in improving MR signal-to-noise ratio (SNR) and also gain the capability of implementing parallel imaging. The volume coil array is evaluated at the ultrahigh field of 7T using FDTD numerical simulations, and the g-factor map at different acceleration rates was also calculated to investigate its parallel imaging performance.
在这项工作中，我们提出并研究了一种使用不同类型的鸟笼线圈进行磁共振成像的体积线圈阵列设计方法。与传统的射频（RF）线圈阵列不同，其阵列元件为表面线圈，所提出的体积线圈阵列由一组独立的体积线圈组成，包括传统的鸟笼线圈、横向鸟笼线圈和螺旋鸟笼线圈。这三个鸟笼线圈的磁通量本质上是相互抵消的，从而产生高度解耦的体积线圈阵列。与传统的非阵列类型的体积线圈相比，体积线圈阵列有利于提高磁共振信号噪声比（SNR），并获得实现并行成像的能力。使用 FDTD 数值模拟在超高场（7T）下对体积线圈阵列进行了评估，还计算了不同加速率下的 g 因子图，以研究其并行成像性能。
