A three-dimensional magnetic susceptibility map of an object including a
patient placed in a magnetic field is generated from a three-dimensional
map of the resonant radio frequency (RF) magnetic flux external to the
patient. The magnetic susceptibility of each voxel is determined from the
shift of the Larmor frequency due to the presence of the voxel in the
magnetizing field. The intensity variation of the transverse RF field over
space is used to determine the coordinate location of each voxel. The RF
field is the near field which is a dipole that serves as a basis element
to form a unique reconstruction. The geometric system function
corresponding to a dipole which determines the spatial intensity
variations of the RF field is a band-pass for k.sub..rho. =k.sub.z. In the
limit, each volume element is reconstructed independently in parallel with
all other volume elements such that the scan time is no greater than the
nuclear free induction decay (FID) time. With the magnetic susceptibility
determined independently (via by the Larmor frequency) from the spatial
reconstruction (via the geometric system function), a digital versus
analogue reconstruction is possible. With these unique features, the
present novel magnetic resonance imaging (MRI) invention has the potential
to generate high resolution, three-dimensional, real-time anatomical
images and images based on physiological parameters with little or no
deterioration from motion artifact.