Patent ID: 7351194
Filing Date: 2008-04-01
Classification: A61B,A61N

Abstract:
1. An arrangement for influencing magnetic particles in a region of action, the arrangement comprising: means for generating a magnetic 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, means for changing the position in space of the two sub-zones in the region of action so that the magnetization of the particles changes locally, 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, an analyzing unit for obtaining information, from the signals, on the magnetic particles in the region of action, a control unit for controlling the means in such a way that in a first mode of operation, the position of the two sub-zones is changed, the signals resulting therefrom are acquired, and information on the spatial distribution of the magnetic particles in the region of action is determined from the signals, in a second mode of operation, the position in space of the two sub-zones is changed for so long, and at a frequency such, that at least part of the region of action is thereby heated up, wherein the means for generating the magnetic field comprise a gradient coil arrangement for generating a gradient magnetic field that reverses its direction and has a zero crossing in the first sub-zone.