van Heteren J G, Henkelman R M, Bronskill M J
Magn Reson Imaging. 1987;5(2):93-9. doi: 10.1016/0730-725x(87)90038-5.
An equivalent circuit is presented which accurately models the performance of magnetic resonance imaging receiver coils used with conducting samples. Coil-sample interaction is determined by measuring either the complex impedance or the associated resonant frequency and quality factor when samples of different conductivity are placed in the coil. The equivalent circuit component values are obtained from these data using a global nonlinear least squares fit. This equivalent circuit contains a minimum number of components necessary for understanding and quantifying the detuning and losses caused by electric and magnetic field coupling with the sample.
本文提出了一种等效电路，该电路能精确模拟与导电样品一起使用的磁共振成像接收线圈的性能。当将不同电导率的样品置于线圈中时，通过测量复阻抗或相关的谐振频率及品质因数来确定线圈与样品之间的相互作用。使用全局非线性最小二乘法拟合从这些数据中获得等效电路元件值。该等效电路包含理解和量化由电场和磁场与样品耦合引起的失谐和损耗所需的最少元件数量。
