  The relation between the parameters of the microscopic structure of the
myocardium and the spin dephasing is analyzed. The microscopic structure of the
myocardium is described in terms of Krogh's capillary model. In this model the
myocardium is reduced to a single capillary which is surrounded by a concentric
tissue cylinder. In the tissue cylinder the dephasing and diffusion process
occurs. Mathematically the dephasing process is described by the
Bloch-Torrey-equation. Experimentally the Signal-time-decay was measured using
a PRESS-sequence and a gradient-echo-sequence. Using the methods provided in
this work, the relation between the capillary radius and the measured free
induction decay can be given.
