Tropp J
General Electric Medical Systems, 47697 Westinghouse Drive, Fremont, California, 94539
J Magn Reson. 1997 May;126(1):9-17. doi: 10.1006/jmre.1997.1149.
Formulas are derived to account for the effect of the mutual inductances, between all meshes, upon the electrical resonance spectra bird-cage resonators, and similar structures such as the TEM resonator of P. K. H. Roschmann (United States Patent 4,746,866) and J. T. Vaughan et al. (Magn. Reson. Med. 32, 206, 1994). The equations are parameterized in terms of isolated mesh frequencies and coupling coefficients, and ought therefore apply not only to simple magnetic couplings used in the derivation, but to electromagnetic couplings as well. A method for measuring the coupling coefficients-applicable to shielded as well as unshielded resonators-is described, based upon the splitting of frequencies in pairs of coupled resonators; and detailed comparisons are given between calculated and measured resonance spectra: for bird-cage resonators, with and without shields, and for the TEM resonator.
推导了公式，以说明所有网孔之间的互感对鸟笼式谐振器的电共振谱的影响，以及对类似结构的影响，如P.K.H.罗施曼（美国专利4,746,866）和J.T.沃恩等人（《磁共振医学》32, 206, 1994）的TEM谐振器。这些方程是根据孤立网孔频率和耦合系数进行参数化的，因此不仅应该适用于推导中使用的简单磁耦合，也适用于电磁耦合。描述了一种测量耦合系数的方法——适用于屏蔽和非屏蔽谐振器——基于耦合谐振器对中频率的分裂；并给出了计算和测量的共振谱之间的详细比较：对于有屏蔽和无屏蔽的鸟笼式谐振器，以及对于TEM谐振器。
