Effects of densely sampled dipole field on quantitative susceptibility mapping.

We present a method of resolving a fine structure in a magnetic susceptibility map, which cannot be distinguished by the conventional method, by using a densely sampled dipole field and by expanding a magnetic field perturbation map. We investigate effects of a sampling density of the dipole field on the spatial resolution and on obtained susceptibility values. When the sampling density is increased, a shape of an otherwise undistinguishable fine structure recovers gradually in an obtained susceptibility map. Furthermore, a peak susceptibility value of the fine structure is slowly getting closer to the correct values.