MPI APPARATUS WITH FAST FIELD OF VIEW MOTION

摘要

The present invention relates to an apparatus (100) for influencing and/or detecting magnetic particles in a field of view (28), in particular an MPI apparatus. The apparatus comprises selection field elements (116) for generating a magnetic selection field (50), drive field coils (124; 125, 126, 127) for changing the position in space of the two sub-zones (52, 54) by means of a magnetic drive field, focus field elements (116) for changing the position in space of the field of view (28) by means of a magnetic focus field, and receiving elements (148) for acquiring detection signals. A static system function of the apparatus is obtained in the absence of a magnetic focus field, from which an extended system function is generated by shifting a time-domain representation of said static system function proportional to the changes of the position of the field of view caused by appliance of the magnetic focus field. Said extended system function is then used for reconstructing the spatial distribution of the magnetic particles in the field of view from the detection signals.

主权项

1. An apparatus for influencing and/or detecting magnetic particles in a field of view comprising:
selection elements, the selection elements comprising a selection field signal generator unit and selection field elements, wherein the selection field elements are arranged to generate a magnetic selection field, the magnetic selection field having a pattern in space of its magnetic field strength such that a first sub-zone has a low magnetic field strength where the magnetization of the magnetic particles is not saturated and a second sub-zone has a higher magnetic field strength where the magnetization of the magnetic particles is saturated is formed in the field of view, drive elements comprising a drive field signal generator unit and drive field coils, wherein the drive field coils are arranged to change a position in space of the first and second sub-zones in the field of view using a magnetic drive field so that the magnetization of the magnetic material changes locally, focus elements comprising a focus field signal generator unit and one or more focus field elements, wherein the focus field elements are arranged to change a position in space of the field of view using a magnetic focus field, receiving elements arranged to acquire detection signals, wherein the detection signals depend on the magnetization in the field of view, wherein the magnetization in the field of view is influenced by the change in the position in space of the first and second sub-zone, storage elements for storing a static system function of the apparatus obtained in the absence of the magnetic focus field, processing elements for generating an extended system function by shifting a time-domain representation of the static system function in proportion to the changes of the position of the field of view caused by appliance of the magnetic focus field, wherein the processing elements reconstruct the spatial distribution of the magnetic particles in the field of view using the detection signals and the extended system function.