Arrangement and method for determining the spatial distribution of magnetic particles

An arrangement for determining spatial distribution of magnetic particles in an examination area, the arrangement comprising:

• a) magnetic field means for generating a magnetic field with a spatial course of a magnetic field strength, such that there is in the examination area a first part-region with a low magnetic field strength and a second part-region with a higher magnetic field strength;
• b) change means for changing the spatial position of the first and second part-regions in the examination area, so that magnetization of the particles changes locally;
• c) detection means for detecting signals which depend on the magnetization in the examination area that is affected by the change in spatial position;
• and
• d) evaluation means for evaluating the signals in order to obtain information about the spatial distribution of the magnetic particles in the examination area,
• wherein a first means selection selected from one or more of the magnetic field means, the change means, and the detection means are arranged at least partially on a medical instrument.