| 摘要 |
The present invention relates to an apparatus and a method for influencing and/or detecting magnetic particles in a field of view (28). The apparatus comprises selection means for generating a magnetic selection field (50) and drive and focus means (120) comprising a drive field signal generator unit (122), a focus field signal generator unit (132) and drive-focus-coils (124; 125, 126, 127) for changing the position in space of the two sub- zones (52, 54) in the field of view (28) by means of a magnetic drive field so that the magnetization of the magnetic material changes locally and a magnetic focus field having a lower frequency than the magnetic drive field. Further, coupling coils (134; 134, 136, 137) coupled between said focus field signal generator unit (132) and said drive-focus-coils (124; 125, 126, 127) are provided to insulate the magnetic drive field from the magnetic focus field. |
