Koninklijke Philips Corporation N.v.

Sven Biederer

Thorsten Manuel Buzug

Timo Frederik Sattel

Tobias Knopp

Peter Boernert

Paul Royston Harvey

Ulrich Wolfgang Katscher

Ingmar Graesslin

Wilhelmus Reinerius Maria Mens

Ferdinand Schweser

The present invention relates to an MPI (Magnetic Particle Imaging) apparatus and a method for influencing and/or detecting magnetic particles in a field of view. Rather than moving the FFP (field free point) along a single, time-consuming high density trajectory it is proposed to use a number of low density trajectories with travelling phase, wherein each of said low density trajectories has the form of a closed curve differently located within the field of view.

Apparatus and method for influencing and/or detecting magnetic particles

The present invention relates to an apparatus and a method for generating and changing a magnetic field in a field of view (), said magnetic field having a, in particular ball-shaped or line-shaped, first sub-zone () having a low magnetic field strength and a second sub-zone () having a higher magnetic field strength. The proposed apparatus comprises at least three pairs of first coils (-), wherein the coils are arranged along a ring around the field of view and wherein the two coils of each pair are opposingly arranged on opposite sides of the field of view, at least one pair of second coils () opposingly arranged on opposite sides of the field of view at the open sides of said ring, generator means () for generating current signals for provision to said first and second coils for generating the desired magnetic fields by said first and second coils, and control means () for controlling said generator means.

Apparatus and method for generating and moving a magnetic field having a field free line

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 () wherein neighboring coil sets are partially overlapping, a transmit coil set comprising: a pair () of 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.

Apparatus and method for influencing and/or detecting magnetic particles in a field of view having an array of single-sided transmit coil sets

In a method and apparatus to enable increased RF duty cycle in high field MR scans, a specific energy absorption rate (SAR) calculation processor calculates the local and global SAR or even a spatial SAR map. By incorporating additional information as, e.g. patient position, the SAR calculation accuracy can be increased as well as by using more patient specific pre-calculated information (e.g. based on different bio meshes), the so called Q-matrices. A sequence controller maybe provided to create a global SAR optimal RF pulse. After the optimal RF pulse is applied, the SAR and its spatial distribution are determined. SAR hotspots are also determined. Q-matrices within an appropriate radius around the hotspots are averaged and added to a global Q-matrix in a weighted fashion. After the global Q-matrix is updated, a new optimal RF pulse is created.

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Luebeck, Germany

Sven Biederer