The present invention relates to an arrangement (10) and a method for imaging an object including a vessel (400), within which magnetic particles (100) are present and which is placed in a region of action, which comprises selection means (210) for generating a 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).
