Lorentz cavity field in media with magnetic structure
Alexander Ruh 1 and Valerij G. Kiselev 1
Dept. of Radiology, Medical Physics,
University Medical Center Freiburg, Freiburg, Germany
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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