Lorentz cavity field in media with magnetic structure

The notion of the Lorentz cavity is fundamental for NMR. It has been recently revised to include effects of fine magnetic structure carried by the cellular architecture in biological tissues such as brain white matter. We point out that the inclusion of cells in the Larmor cavity crucially depends on the relation of their size to the diffusion length during the acquisition of the free induction decay (FID). We demonstrate using numerical simulations how the cavity field interpolates between the classical value for small cells and the generalized one for large cells.

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