Influencing and/or detecting magnetic particles in a region of action of an examination object

A method for influencing and/or detecting magnetic particles (100) in a region of action (300) of an examination object (350), wherein the method comprises the steps of

• generating a magnetic selection field (211) by means of selection means (210), the magnetic selection field (211) having a pattern in space of its magnetic field strength such that a first sub-zone (301) having a low magnetic field strength and a second sub-zone (302) having a higher magnetic field strength are formed in the region of action (300)
• changing the position in space of the two sub-zones (301, 302) in the region of action (300) by means of a magnetic drive field (221) generated by drive means (220) so that the magnetization of the magnetic particles (100) change locally,
• acquiring signals by means of receiving means (230), which signals depend on the magnetization in the region of action (300), which magnetization is influenced by the change in the position in space of the first and second sub-zone (301, 302),
• wherein the selection means (210) and/or the drive means (220) and/or the receiving means (230) are provided at least partly movable relative to the examination object (350) during the acquisition and/or the change in the position in space of the two sub-zones (301, 302) in the region of action (300).