Method for determining the spacial distribution of magnetic particles

摘要

The method involves generating a magnetic field to produce in an examination region a first sub-region of low magnetic field strength, and a second sub-region of high magnetic field strength. The spatial position of the two sub-regions is varied so that the magnetization of the particles varies locally. Signals are detected that depend on the magnetization influenced by this variation. The signals are evaluated to obtain information relating to the spatial distribution of the magnetic particles in the examination region. Independent claims are also included for the following: (1) The use of mono-domain particles made of ferro- or ferrite-magnetic material in the method; and (2) an apparatus for performing the method.