Weizenecker
Jeurgen Weizenecker, Stutensee DE
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20110246103 | ARRANGEMENT AND METHOD FOR DETECTING AND/OR LOCATING A MAGNETIC MATERIAL IN A REGION OF ACTION - In Magnetic Particle Imaging (MPI) the reconstruction requires the knowledge of a so called system function. This function describes the relation between spatial position and frequency response and is currently measured once for a scanner set-up and a tracer material. For reasonable resolutions and fields of view the system function becomes quite large, resulting in large acquisition times to obtain reasonable signal-to-noise. However, the system function has a number of properties which can be used to improve signal-to-noise. According to the present invention use is made of the spatial symmetry and/or identical responses at different frequencies for this purpose. | 10-06-2011 |
Juergen Weizenecker, Stutensee DE
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20110237928 | ARRANGEMENT AND METHOD FOR DETECTING AND/OR LOCATING A MAGNETIC MATERIAL IN A REGION OF ACTION - In Magnetic Particle Imaging (MPI) the reconstruction requires the knowledge of a so called system function. This function describes the relation between spatial position and frequency response. For reasonable resolutions and field of views the system function becomes quite large, resulting in large acquisition times for the system function and high memory demand during reconstruction. The present invention proposes to reduce the size of the system function matrix by making use of structural properties of the matrix. Such properties are, for instance, spatial symmetries reducing the number of columns and identical responses at different frequencies reducing the number of rows. In other embodiments the matrix can be transformed to a sparse representation using appropriate base functions. | 09-29-2011 |
20120035456 | ARRANGEMENT FOR IMAGING AN OBJECT INCLUDING A VESSEL USING MAGNETIC PARTICLE IMAGING - An arrangement ( | 02-09-2012 |
Juergen Weizenecker, Eindhoven NL
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20100033173 | ARRANGEMENT FOR INFLUENCING AND/OR DETECTING MAGNETIC PARTICLES IN A REGION OF ACTION AND METHOD OF PRODUCING A DISK SHAPED COIL - An arrangement for influencing and/or detecting magnetic particles in a region of action and a method of producing a disk shaped coil is disclosed, which arrangement comprises: selection means 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 region of action, drive means for changing the position in space of the two sub-zones in the region of action by means of a magnetic drive field so that the magnetization of the magnetic particles changes locally, receiving means for acquiring signals, which signals depend on the magnetization in the region of action, which magnetization is influenced by the change in the position in space of the first and second sub-zone, wherein the selection means and/or the drive means and/or the receiving means comprises an at least partially disk shaped coil. | 02-11-2010 |
Juergen Weizenecker, Eggenstein DE
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20110251476 | ARRANGEMENT AND METHOD FOR MEASURING THE LOCAL VELOCITY OF A LIQUID - The present invention relates to an arrangement ( | 10-13-2011 |
Jurgen Weizenecker, Eggenstein-Leopoldshafen DE
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20150300987 | REMOVAL OF BACKGROUND IN MPI - The present invention relates to an apparatus ( | 10-22-2015 |
Jurgen Weizenecker, Eindhoven DE
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20100096581 | METHOD AND ARRANGEMENT FOR SEPARATING MAGNETIC PARTICLES, MAGNETIC PARTICLES AND USE MAGNETIC PARTICLES - A method and an arrangement for separating magnetic particles, magnetic particles and the use of magnetic particles are disclosed wherein the method comprises the steps of: —subjecting the magnetic particles to a first magnetic field such that the particle direction of easy magnetization is oriented parallel to the magnetic field vector of the first magnetic field, —subjecting the magnetic particles to a second magnetic field having an orientation rotated about an angle relative to the magnetic field vector of the first magnetic field, —applying a separating force on the magnetic particles. | 04-22-2010 |
Jurgen Weizenecker, Stutensee DE
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20110273175 | PERMANENT MAGNETIC ASSEMBLY FOR - The present invention relates to an arrangement ( | 11-10-2011 |
20120153948 | APPARATUS AND METHOD FOR INFLUENCING AND/OR DETECTING MAGNETIC PARTICLES IN A FIELD OF VIEW - The present invention relates to an apparatus ( | 06-21-2012 |
Jurgen Weizenecker, Eindhoven NL
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20100045281 | ARRANGEMENT AND METHOD FOR DETECTING AND/OR LOCATING A MAGNETIC MATERIAL IN A REGION OF ACTION, USE OF AN ARRANGEMENT IN THE EXAMINATION OF BUILDINGS - An arrangement and a method for detecting and/or locating magnetic material, and the use of an arrangement in the examination of buildings is disclosed, which arrangement comprises: selection means 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 region of action, drive means for changing the position in space of the two sub-zones in the region of action by means of a magnetic drive field so that the magnetization of the magnetic material changes locally, receiving means for acquiring detection signals, which detection signals depend on the magnetization in the region of action, which magnetization is influenced by the change in the position in space of the first and second sub-zone, wherein the magnetic selection field comprises at least a time-variable field component varying at a frequency of at least about 100 Hz. | 02-25-2010 |
20100052668 | ARRANGEMENT AND METHOD FOR INFLUENCING AND/OR DETECTING MAGNETIC PARTICLES IN A REGION OF ACTION - An arrangement and a method for influencing and/or detecting magnetic particles in a region of action is disclosed, which arrangement comprises:—selection means 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 region of action,—drive means for changing the position in space of the two sub-zones in the region of action by means of a magnetic drive field so that the magnetization of the magnetic particles changes locally,—receiving means for acquiring signals, which signals depend on the magnetization in the region of action, which magnetization is influenced by the change in the position in space of the first and second sub-zone, wherein the selection means and/or the drive means and/or the receiving means comprises at least partially a litz wire/stranded wire. | 03-04-2010 |
20100109662 | ARRANGEMENT AND METHOD FOR INFLUENCING AND/OR DETECTING MAGNETIC PARTICLES IN A REGION OF ACTION - An arrangement and a method for influencing and/or detecting magnetic particles in a region of action is disclosed, which arrangement comprises: selection means 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 region of action, drive means for changing the position in space of the two sub-zones in the region of action by means of a magnetic drive field so that the magnetization of the magnetic particles changes locally, wherein the selection means comprise at least one permanent magnet comprising a high resistive permanent magnet material. | 05-06-2010 |
20100179412 | ARRANGEMENT FOR MAGNETIC PARTICLE IMAGING, METHOD FOR INFLUENCING AND/OR DETECTING MAGNETIC PARTICLES AND MAGNETIC PARTICLE - An arrangement for magnetic particle imaging and a method for influencing and/or detecting magnetic particles in a region of action is disclosed, which arrangement comprises: magnetic particles in a region of action, the magnetic particles being influenceable and/or detectable, selection means 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 strengthare formed in the region of action, drive means for changing the position in space of the two sub-zones in the region of action by means of a magnetic drive field so that the magnetization of the magnetic particles changes locally, wherein each magneticparticle comprises a non-magnetic substrate with a layer of stainless steel. | 07-15-2010 |
Jürgen Weizenecker, Hamburg DE
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20090240135 | METHOD OF DETERMINING A SPATIAL DISTRIBUTION OF MAGNETIC PARTICLES - The invention relates to a method of determining a spatial distribution of magnetic particles in an examination zone, in which a magnetic field is generated that has a first sub-zone of lower magnetic field strength and a second sub-zone of higher magnetic field strength. The positions of the two sub-zones are changed, as a result of which the magnetization in the examination zone changes. Measured values that depend on the change in magnetization are acquired. A reference response function by means of which measured values can be determined mathematically from a spatial distribution of magnetic particles is then determined by means of at least extensive magnetic specimen distribution. Finally, the spatial distribution of magnetic particles is reconstructed from the measured values by means of the reference response function. | 09-24-2009 |
Jürgen Weizenecker, Hamburg DE
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20080284436 | Imaging Region-Specific Radio Frequency Coils for Mri - A radio frequency coil includes a non-cylindrical conformal surface ( | 11-20-2008 |
20090240135 | METHOD OF DETERMINING A SPATIAL DISTRIBUTION OF MAGNETIC PARTICLES - The invention relates to a method of determining a spatial distribution of magnetic particles in an examination zone, in which a magnetic field is generated that has a first sub-zone of lower magnetic field strength and a second sub-zone of higher magnetic field strength. The positions of the two sub-zones are changed, as a result of which the magnetization in the examination zone changes. Measured values that depend on the change in magnetization are acquired. A reference response function by means of which measured values can be determined mathematically from a spatial distribution of magnetic particles is then determined by means of at least extensive magnetic specimen distribution. Finally, the spatial distribution of magnetic particles is reconstructed from the measured values by means of the reference response function. | 09-24-2009 |