An arrangement for influencing and/or detecting magnetic particles in a
region of action and a method of producing a disk shaped coil is
disclosed, which arrangement comprises: selection means for generating a
magnetic selection field having a pattern in space of its magnetic field
strength such that a first sub-zone having a low magnetic field strength
and a second sub-zone having a higher magnetic field strength are formed
in the region of action, drive means for changing the position in space
of the two sub-zones in the region of action by means of a magnetic drive
field so that the magnetization of the magnetic particles changes
locally, receiving means for acquiring signals, which signals depend on
the magnetization in the region of action, which magnetization is
influenced by the change in the position in space of the first and second
sub-zone, wherein the selection means and/or the drive means and/or the
receiving means comprises an at least partially disk shaped coil.