MARKER FOR POSITION DETERMINATION WITH A MAGNETIC METHOD

摘要

The application relates to a marker whose position in an examination region can be determined by a magnetic method. This method is used to determine the spatial distribution of magnetic particles in an examination region. A spatially inhomogeneous gradient magnetic field is generated, having at least one low field strength region in which the magnetization of the particles is in an unsaturated state, while they are in a saturated state in the rest of the region. Displacing the low field strength region by variation means insid the examination region leads to a change in the magnetization of the magnetic particles, which can be detected externally and contains information about th spatial distribution of the magnetic particles in the examination region. Wit the aid of the markers according to the invention it is also possible to determine the position of objects, or parts of the examination subject in the examination region.