Patent ID: 8355771

Claim:
A method of determining a spatial distribution of magnetic particles in an examination zone, the method comprising: a) generating measured values by generating a first magnetic having a pattern of magnetic field strength in space such that a first sub-zone of lower magnetic field strength and a second sub-zone of higher magnetic field strength are produced in the examination zone, changing the positions in space of the two sub-zones in the examination zone, thus causing a local change in the magnetization of the particles, acquiring measured values that depend on the magnetization in the examination zone, which has been affected by the change in the positions of the two sub-zones, b) providing a reference response function by means of which measured values can be determined mathematically from a spatial distribution of magnetic particles, the reference response function being determined by de-convoluting at least one extensive specimen distribution by means of at least one extensive magnetic specimen distribution, and c) reconstructing the spatial distribution (C({right arrow over (x)})) of magnetic particles in the examination zone from the measured values by means of the reference response function provided.