Patent ID: 8368394

Claim:
An arrangement ( 10 ) for influencing and/or detecting magnetic particles ( 100 ) in a region of action ( 300 ), which arrangement 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 ), drive means ( 220 ) for 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 ) so that the magnetization of the magnetic particles ( 100 ) changes locally, receiving means ( 230 ) for detecting signals from the magnetic particles ( 100 ), 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 ) comprises at least partially a litz wire/stranded wire ( 250 ), and wherein the signals detected from the magnetic particles ( 100 ) located in the sub-zone ( 301 ) are detected in another frequency band than a frequency band of the magnetic drive field ( 221 ).