Apparatus and method for influencing and/or detecting magnetic particles in a field of view having an array of single-sided transmit coil sets
First Claim
1. An apparatus for influencing and/or detecting magnetic particles in a field of view, which apparatus comprises:
- i) two or more transmit coil sets, wherein neighboring transmit coil sets are partially overlapping, each transmit coil set comprising;
a pair of coplanar, concentrically arranged selection field coils for generating a magnetic selection 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 field of view, andat least one pair of drive field coils for changing the position in space of the two sub-zones in the field of view by means of a magnetic drive field so that the magnetization of the magnetic particles changes locally, said at least one pair of drive field coils being arranged parallel to said pair of selection field coils and being formed by two neighboring coil loops having adjacent segments, the adjacent segments being angularly offset from adjacent segments of a neighboring pair of drive field coils,ii) generator means for generating current signals for provision to said selection field coils and said drive field coils for generating desired magnetic fields by said coils, andiii) control means for controlling said generator means to generate direct currents of opposite directions for provision to the two selection field coils of said pair of selection field coils and alternate currents of opposite directions for provision to the two drive field coils of said at least one pair of drive field coilswherein the control means is configured to control said generator means to generate currents for provision to the coils of the transmit coil sets such that for transfer of the first sub-zone from a first transmit coil set to a second transmit coil set the first sub-zone is driven to the border of the field of view of the first transmit coil set, the magnetic selection field of the first transmit coil set is decreased and the magnetic selection field of the second transmit coil set is increased.
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Accused Products
Abstract
The present invention relates to an apparatus and a method for influencing and/or detecting magnetic particles in a field of view. To increase the field of view and, at the same time, allow access to the patient during imaging, the apparatus comprises two or more transmit coil sets (200) wherein neighboring coil sets are partially overlapping, a transmit coil set comprising: a pair (210) of concentrically arranged selection field coils (211, 212) for generating a magnetic selection field (50) having a pattern in space of its magnetic field strength such that a first sub-zone (52) having a low magnetic field strength and a second sub-zone (54) having a higher magnetic field strength are formed in the field of view (28), and at least one pair (220, 230) of drive field coils (221, 222; 231, 232) 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 particles changes locally, said at least one pair (220, 230) of drive field coils being arranged parallel to said pair (210) of selection field coils (211, 212) and being formed by two neighboring coil loops.
9 Citations
14 Claims
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1. An apparatus for influencing and/or detecting magnetic particles in a field of view, which apparatus comprises:
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i) two or more transmit coil sets, wherein neighboring transmit coil sets are partially overlapping, each transmit coil set comprising; a pair of coplanar, concentrically arranged selection field coils for generating a magnetic selection 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 field of view, and at least one pair of drive field coils for changing the position in space of the two sub-zones in the field of view by means of a magnetic drive field so that the magnetization of the magnetic particles changes locally, said at least one pair of drive field coils being arranged parallel to said pair of selection field coils and being formed by two neighboring coil loops having adjacent segments, the adjacent segments being angularly offset from adjacent segments of a neighboring pair of drive field coils, ii) generator means for generating current signals for provision to said selection field coils and said drive field coils for generating desired magnetic fields by said coils, and iii) control means for controlling said generator means to generate direct currents of opposite directions for provision to the two selection field coils of said pair of selection field coils and alternate currents of opposite directions for provision to the two drive field coils of said at least one pair of drive field coils wherein the control means is configured to control said generator means to generate currents for provision to the coils of the transmit coil sets such that for transfer of the first sub-zone from a first transmit coil set to a second transmit coil set the first sub-zone is driven to the border of the field of view of the first transmit coil set, the magnetic selection field of the first transmit coil set is decreased and the magnetic selection field of the second transmit coil set is increased. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for influencing and/or detecting magnetic particles in a field of view, which method comprises the steps of:
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i) generating magnetic fields by two or more transmit coil sets, wherein neighboring transmit coil sets are partially overlapping, said step of generating magnetic fields comprising; generating a magnetic selection 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 field of view by a pair of coplanar, concentrically arranged selection field coils and changing the position in space of the two sub-zones in the field of view by means of a magnetic drive field so that the magnetization of the magnetic particles changes locally by at least one pair of drive field coils, said at least one pair of drive field coils being arranged parallel to said pair of selection field coils and being formed by two neighboring coil loops having adjacent segments, the adjacent segments being angularly offset from adjacent segments of a neighboring pair of drive field coils, ii) generating, with a generator means, current signals for provision to said selection field coils and said drive field coils for generating desired magnetic fields by said coils, and iii) controlling, with a control means, said generator means to generate direct currents of opposite directions for provision to the two selection field coils of said pair of selection field coils and alternate currents of opposite directions for provision to the two drive field coils of said at least one pair of drive field coils wherein the control means is configured to control said generator means to generate currents for provision to the coils of the transmit coil sets such that for transfer of the first sub-zone from a first transmit coil set to a second transmit coil set the first sub-zone is driven to the border of the field of view of the first transmit coil set, the magnetic selection field of the first transmit coil set is decreased and the magnetic selection field of the second transmit coil set is increased. - View Dependent Claims (14)
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Specification