Patent ID: 9689932
Date: 2017-06-27
CPC Classifications: A61B,G01N,G01R

Claim:
1. An apparatus for influencing and/or detecting magnetic particles in a field of view, which apparatus comprises: selection-and-focus means for generating a magnetic selection-and-focus field having a pattern in space of its magnetic field strength such that a first sub-zone having a low magnetic field strength where the magnetization of the magnetic particles is not saturated and a second sub-zone having a higher magnetic field strength where the magnetization of the magnetic particles is saturated are formed in the field of view and for changing the position in space of the field of view within an examination area, wherein said selection-and-focus means includes at least one set of selection-and-focus field coils and a selection-and-focus field generator unit for generating selection-and-focus field currents to be provided to said at least one set of selection-and-focus field coils for controlling the generation of said magnetic selection-and-focus field, wherein said at least one set of selection-and-focus field coils includes drive means including a drive field signal generator unit and drive field coils for changing the position in space and/or size of the two sub-zones in the field of view by means of a magnetic drive field so that the magnetization of the magnetic material changes locally.