Different excitation and reception distributions with a single-loop transmit-receive surface coil near a head-sized spherical phantom at 300 MHz
Different excitation and reception distributions with a single-loop transmit-receive surface coil near a head-sized spherical phantom at 300 MHz
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DOI：
10.1002/mrm.10153
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发表时间：
2002-05-01
影响因子：
3.3
通讯作者：
Chen, W
中科院分区：
文献类型：
--
作者：
Collins, CM;Yang, QX;Chen, W
通过计算和实验来检查由直径为 10 厘米的表面线圈在 300 MHz 下激励的 16 厘米直径球形模型中的 B、场行为和信号强度分布。在这个简单的高频系统中，存在非常复杂的射频场行为，导致不同的激励和接收分布。这项工作包括一个简单的演示，即线圈的接收能力与沿与核进动相反的方向旋转的 Ell 场的圆偏振分量的大小成正比。很明显，即使在这个频率下头大小样本的非常简单的系统中，考虑单独的激励和接收分布以理解信号强度分布也很重要。 (C) 2002 Wiley-Liss, Inc.
Calculations and experiments were used to examine the B, field behavior and signal intensity distribution in a 16-cm diameter spherical phantom excited by a 10-cm diameter surface coil at 300 MHz. In this simple system at this high frequency very complex RF field behavior exists, resulting in different excitation and reception distributions. Included in this work is a straightforward demonstration that coil receptivity is proportional to the magnitude of the circularly polarized component of the Ell field that rotates in the direction opposite to that of nuclear precession. It is clearly apparent that even in very simple systems in head-sized samples at this frequency it is important to consider the separate excitation and reception distributions in order to understand the signal intensity distribution. (C) 2002 Wiley-Liss, Inc.