MAGNETICALLY INDUCED SURFACE-CHARGES ON SAMPLES IN MAGNETIC-RESONANCE-IMAGING RADIOFREQUENCY COILS - EFFECT ON ELECTRIC-FIELDS, SAMPLE LOSSES, AND COIL RESONANCE

We present a solution to Maxwell’s equations which describe the inductive interaction between an irregularly shaped sample in a magnetic resonance imaging rf coil. It is demonstrated that the inductive interaction between the coil and sample can induce charge densities on the sample surface and that these charge densities lead to observable changes in coil Q, resonant frequency offset and sample power dissipation. © 1990, American Association of Physicists in Medicine. All rights reserved.