Arnder L L, Shattuck M D, Black R D
Department of Radiology, University of North Carolina, Chapel Hill, USA.
Magn Reson Med. 1996 May;35(5):727-33. doi: 10.1002/mrm.1910350514.
The signal-to-noise ration (SNR) from implanted coils is widely known to be superior to that from surface coils. This article addresses the quantitative aspects of this improvement by explicitly evaluating the magnetic vector potential in a conducting medium of finite extent for both implanted and surface coils. The predictions of the model are tested with actual image data from spin warp experiments on gelatin phantoms. The authors derived a simplified expression that yields the gain in SNR of an implanted coil relative to that of a surface coil and is valid in many practical situations.
植入式线圈的信噪比（SNR）明显优于表面线圈，这是广为人知的。本文通过明确评估植入式线圈和表面线圈在有限导电介质中的磁矢势，探讨了这种改善的定量方面。利用明胶模型自旋扭曲实验的实际图像数据对该模型的预测进行了测试。作者推导了一个简化表达式，该表达式给出了植入式线圈相对于表面线圈的SNR增益，并且在许多实际情况下都是有效的。
