Harpen M D
University of South Alabama, Department of Radiology, Mobile 36617.
Med Phys. 1992 May-Jun;19(3):607-10. doi: 10.1118/1.596852.
Presented is a theoretical description of the self-capacitance of a low-pass birdcage coil. The problem considered is that the modification of the distributed self-capacitance produced by the electric interaction between the coil and a cylindrical Faraday screen and illustrates the phenomenon of coil self-capacitance as well as the influence of Faraday screens. Changes in coil self-capacitance produced by the presence of the screens are shown to be consistent with measured shifts in coil resonant frequencies.
本文给出了低通鸟笼式线圈自电容的理论描述。所考虑的问题是线圈与圆柱形法拉第屏蔽之间的电相互作用对分布自电容的修正，并阐述了线圈自电容现象以及法拉第屏蔽的影响。结果表明，屏蔽的存在所引起的线圈自电容变化与实测的线圈谐振频率偏移一致。
