Patents by Inventor Volker Niemann

Volker Niemann has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20210116525
    Abstract: A hybrid imaging apparatus for imaging an object to be examined located in a sample volume can be operated in an MPI mode and in at least one further imaging mode and comprises a magnet arrangement embodied to generate, in the MPI mode, a magnetic field with a gradient B1 and a field-free region in the sample volume, wherein the magnet arrangement comprises a ring magnet pair with two ring magnets in a Halbach dipole configuration, which are arranged coaxially on a common Z-axis that extends through the sample volume, wherein the ring magnets are arranged so as to be twistable relative to one another about the Z-axis. Consequently, it is possible to generate magnetic fields that meet the requirements of both MRI and MPI such that the hybrid imaging apparatus can be equipped for measurements in various imaging modes, including MPI, MRI and CT.
    Type: Application
    Filed: October 19, 2020
    Publication date: April 22, 2021
    Inventors: Jochen FRANKE, Volker NIEMANN
  • Patent number: 10976391
    Abstract: A magnet arrangement having a hollow-cylindrical magnet element that has an axial length Lz,M and an inner radius Rin, is constructed from magnet segments arranged concentrically around the z-axis, and has a Halbach magnetization. At least one ring-shaped magnet element has a notched, hollow-cylindrical cutout extending circumferentially around the z-axis symmetrically with respect to the plane z=0, the axial extent Lz,A of the cutout being less than the axial length Lz,M of the magnet element. The cutout has a radial depth TA and an axial length Lz,A<Lz,M between the z-positions z=?zA to z=+zA. The radial depth TA and the axial length Lz,A of the cutout are to ensure that the remaining inhomogeneity of the homogenous magnetic field B0 in a predefined measurement volume having an axial plateau length LP in the center of the magnet arrangement does not exceed 10 ppm.
    Type: Grant
    Filed: November 25, 2019
    Date of Patent: April 13, 2021
    Assignee: BRUKER BIOSPIN GMBH
    Inventors: Rainer Pietig, Volker Niemann, Lukas Haenichen
  • Publication number: 20200166591
    Abstract: A magnet arrangement having a hollow-cylindrical magnet element that has an axial length Lz,M and an inner radius Rin, is constructed from magnet segments arranged concentrically around the z-axis, and has a Halbach magnetization. At least one ring-shaped magnet element has a notched, hollow-cylindrical cutout extending circumferentially around the z-axis symmetrically with respect to the plane z=0, the axial extent Lz,A of the cutout being less than the axial length Lz,M of the magnet element. The cutout has a radial depth TA and an axial length Lz,A<Lz,M between the z-positions z=?zA to z=+zA. The radial depth TA and the axial length Lz,A of the cutout are to ensure that the remaining inhomogeneity of the homogenous magnetic field B0 in a predefined measurement volume having an axial plateau length LP in the center of the magnet arrangement does not exceed 10 ppm.
    Type: Application
    Filed: November 25, 2019
    Publication date: May 28, 2020
    Inventors: Rainer PIETIG, Volker NIEMANN, Lukas HAENICHEN
  • Patent number: 10598745
    Abstract: A magnet arrangement (1) having a permanent magnet system with at least two ring-shaped magnet elements (2) which are made of individual magnet segments (3), are arranged cylindrically symmetrically and stacked on one another in the z direction and/or concentrically, and arranged such that the magnetization directions of the individual segments in the rings extend parallel in an x-y plane. The magnet elements align relative to one another in the z direction and have a Halbach magnetization Before final mounting in the magnetic resonance apparatus, the magnet elements are prefabricated as solid structures and their respective magnet segments are fixed undisplaceably relative to one another. But the magnet elements are displaceable relative to one another in the x-y plane, and are mounted rotatably and/or tiltably relative to one another.
    Type: Grant
    Filed: March 30, 2018
    Date of Patent: March 24, 2020
    Assignee: BRUKER BIOSPIN GMBH
    Inventors: Volker Niemann, Rainer Pietig, Lukas Haenichen
  • Publication number: 20200064424
    Abstract: A magnet arrangement (1) in a magnetic resonance apparatus having a permanent magnet system for generating a homogeneous magnetic field in a direction perpendicular to a z-axis in a measurement volume. The magnet system has at least two ring-shaped magnet elements (2) in a ring plane, which are arranged coaxially around the z-axis and are constructed from individual magnet segments (3) arranged next to one another in a Halbach configuration. The magnetization direction of at least two ring-shaped magnet elements deviates from the ring plane such that the component perpendicular to the ring plane varies cosinusoidally with the azimuthal angle of the respective ring-shaped magnet element. The magnetization of in each case two ring-shaped magnet elements is mirror-symmetrical with respect to one another, wherein the mirror plane is the central x-y-plane perpendicular to the z-axis. The disclosed arrangement provides a compact and lightweight permanent magnet arrangement for an MR apparatus.
    Type: Application
    Filed: August 22, 2019
    Publication date: February 27, 2020
    Inventors: Volker NIEMANN, Rainer PIETIG
  • Patent number: 10393833
    Abstract: A superconducting magnet coil arrangement has a high-temperature superconductor (HTS) coil section (1a,1b,1c) in the form of a solenoid that is wound with an HTS tape conductor, and also has a field-shaping device comprising at least two field-shaping elements (2a,2b,2c). At least one respective field-shaping element is arranged adjoining each of the two axial ends of the HTS coil section, the field-shaping elements being configured in such a way that they reduce the field angle of the magnetic field generated by the magnet coil arrangement with respect to the axial direction in the region of the HTS coil section by at least 1.5°.
    Type: Grant
    Filed: May 12, 2017
    Date of Patent: August 27, 2019
    Assignee: BRUKER BIOSPIN GMBH
    Inventors: Patrick Wikus, Volker Niemann, Wolfgang Frantz, Michael Dumm, Michael Wagenknecht
  • Patent number: 10191130
    Abstract: A device for alternating examination of a measurement object (170) by means of MPI and MRI with two magnetic field-generating elements is presented. The device is characterized by a main magnet coil system with two coaxial partial coil systems (100a1, 100a2; 100b2, 100b1) arranged mirror-symmetrically relative to a central plane running perpendicularly to the z-axis through the first volume under investigation (162). The volumes under investigation are superimposed. A polarity reversal device (190) reverses the polarity of the current through a partial coil system and the main magnet coil system generates a homogeneous magnetic field of at least sixth order in the first volume under investigation when the partial coil systems have identical polarity, and a spatially strongly varying magnetic field profile in the second volume under investigation when the polarities are opposite. Repositioning of the measurement object is thereby simplified or can even be eliminated.
    Type: Grant
    Filed: November 22, 2013
    Date of Patent: January 29, 2019
    Assignee: BRUKER BIOSPIN MRI GMBH
    Inventors: Michael Heidenreich, Jochen Franke, Volker Niemann, Rainer Pietig
  • Publication number: 20180292481
    Abstract: A magnet arrangement (1) having a permanent magnet system with at least two ring-shaped magnet elements (2) which are made of individual magnet segments (3), are arranged cylindrically symmetrically and stacked on one another in the z direction and/or concentrically, and arranged such that the magnetization directions of the individual segments in the rings extend parallel in an x-y plane. The magnet elements align relative to one another in the z direction and have a Halbach magnetization Before final mounting in the magnetic resonance apparatus, the magnet elements are prefabricated as solid structures and their respective magnet segments are fixed undisplaceably relative to one another. But the magnet elements are displaceable relative to one another in the x-y plane, and are mounted rotatably and/or tiltably relative to one another.
    Type: Application
    Filed: March 30, 2018
    Publication date: October 11, 2018
    Inventors: Volker Niemann, Rainer Pietig, Lukas Haenichen
  • Patent number: 10060998
    Abstract: An arrangement for setting the spatial profile of a magnetic field in a working volume of a main field magnet (2), in particular a superconducting main field magnet, of a magnetic resonance installation. The main field magnet is arranged in a cryostat (1) and the spatial profile is set by a passive shim apparatus (3) with magnetic field forming elements which are arranged within the cryostat during operation and which have cryogenic temperatures. The magnetic resonance installation contains a room temperature tube (4), in which the sample volume is situated during operation. The passive shim apparatus is introduced into or removed from the cold region of the cryostat via a vacuum lock (5), without needing to ventilate the cold region of the cryostat. This provides a relatively simple, cost effective, and time-efficient method to carry out a stable field homogenization using a passive shim apparatus.
    Type: Grant
    Filed: May 5, 2017
    Date of Patent: August 28, 2018
    Assignee: Bruker BioSpin GmbH
    Inventors: Patrick Wikus, Volker Niemann, Wolfgang Frantz, Michael Dumm, Michael Wagenknecht, Steffen Bonn
  • Patent number: 9927500
    Abstract: Device for alternating examination of a measurement object (103) by means of MPI and MRI within a magnetic system is characterized in that the magnetic system has a specified magnetic field profile, which is not temporally variable during the alternating examination, and both magnetic field generating elements (101,102; 201,202; 801a,801b,811,812) generate a magnetic field portion, in the first examination region (104) and in the second examination region (105), which is essential for the MRI operation and for the MPI operation, and in that there is a transport apparatus (106) by means of which the measurement object can be moved out of the first examination region and into the second examination region and/or vice versa. The total space requirement for both modalities is thus reduced and the complexity of an integrally designed hybrid system is minimized.
    Type: Grant
    Filed: August 16, 2013
    Date of Patent: March 27, 2018
    Assignee: Bruker BioSpin MRI GmbH
    Inventors: Michael Heidenreich, Jochen Franke, Volker Niemann, Rainer Pietig
  • Publication number: 20170343629
    Abstract: A superconducting magnet coil arrangement has a high-temperature superconductor (HTS) coil section (1a,1b,1c) in the form of a solenoid that is wound with an HTS tape conductor, and also has a field-shaping device comprising at least two field-shaping elements (2a,2b,2c). At least one respective field-shaping element is arranged adjoining each of the two axial ends of the HTS coil section, the field-shaping elements being configured in such a way that they reduce the field angle of the magnetic field generated by the magnet coil arrangement with respect to the axial direction in the region of the HTS coil section by at least 1.5°.
    Type: Application
    Filed: May 12, 2017
    Publication date: November 30, 2017
    Inventors: Patrick WIKUS, Volker NIEMANN, Wolfgang FRANTZ, Michael DUMM, Michael WAGENKNECHT
  • Publication number: 20170322270
    Abstract: An arrangement for setting the spatial profile of a magnetic field in a working volume of a main field magnet (2), in particular a superconducting main field magnet, of a magnetic resonance installation. The main field magnet is arranged in a cryostat (1) and the spatial profile is set by a passive shim apparatus (3) with magnetic field forming elements which are arranged within the cryostat during operation and which have cryogenic temperatures. The magnetic resonance installation contains a room temperature tube (4), in which the sample volume is situated during operation. The passive shim apparatus is introduced into or removed from the cold region of the cryostat via a vacuum lock (5), without needing to ventilate the cold region of the cryostat. This provides a relatively simple, cost effective, and time-efficient method to carry out a stable field homogenization using a passive shim apparatus.
    Type: Application
    Filed: May 5, 2017
    Publication date: November 9, 2017
    Inventors: Patrick WIKUS, Volker NIEMANN, Wolfgang FRANTZ, Michael DUMM, Michael WAGENKNECHT, Steffen BONN
  • Publication number: 20150316628
    Abstract: A device for alternating examination of a measurement object (170) by means of MPI and MRI with two magnetic field-generating elements is presented. The device is characterized by a main magnet coil system with two coaxial partial coil systems (100a1, 100a2; 100b2, 100b1) arranged mirror-symmetrically relative to a central plane running perpendicularly to the z-axis through the first volume under investigation (162). The volumes under investigation are superimposed. A polarity reversal device (190) reverses the polarity of the current through a partial coil system and the main magnet coil system generates a homogeneous magnetic field of at least sixth order in the first volume under investigation when the partial coil systems have identical polarity, and a spatially strongly varying magnetic field profile in the second volume under investigation when the polarities are opposite. Repositioning of the measurement object is thereby simplified or can even be eliminated.
    Type: Application
    Filed: November 22, 2013
    Publication date: November 5, 2015
    Inventors: Michael Heidenreich, Jochen Franke, Volker Niemann, Rainer Pietig
  • Publication number: 20150285875
    Abstract: Device for alternating examination of a measurement object (103) by means of MPI and MRI within a magnetic system is characterized in that the magnetic system has a specified magnetic field profile, which is not temporally variable during the alternating examination, and both magnetic field generating elements (101,102; 201,202; 801a,801b,811,812) generate a magnetic field portion, in the first examination region (104) and in the second examination region (105), which is essential for the MRI operation and for the MPI operation, and in that there is a transport apparatus (106) by means of which the measurement object can be moved out of the first examination region and into the second examination region and/or vice versa. The total space requirement for both modalities is thus reduced and the complexity of an integrally designed hybrid system is minimized.
    Type: Application
    Filed: August 16, 2013
    Publication date: October 8, 2015
    Inventors: Michael Heidenreich, Jochen Franke, Volker Niemann, Rainer Pietig
  • Patent number: 7330092
    Abstract: A superconducting magnet coil configuration comprising at least one section of a superconducting strip conductor, which is continuously wound in a cylindrical winding chamber (1) between two end flanges (2, 3) in several solenoid-like layers is characterized in that the section comprises an axial region of reduced current density (=notch region (12)), and the winding chamber (1) in the notch region (12) contains a first separating body (4) with a truncated conical envelope (5) which axially divides the winding chamber (1) into two partial chambers (6, 7), the superconducting strip conductor being guided over the truncated conical envelope (5) of the first separating body (4) from one partial chamber (6) into the other partial chamber (7) via a single-layer transfer winding (9), and a second separating body (10) is provided which supplements the first separating body (4) in the notch region (12) in a radial outer direction to form a circular cylinder, wherein the single-layer transfer winding (9) is disposed b
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: February 12, 2008
    Assignee: Bruker Biospin GmbH
    Inventors: Volker Niemann, Gerhard Roth, Klaus Schlenga
  • Patent number: 7317369
    Abstract: A superconducting magnet coil configuration comprising at least one section of a superconducting strip conductor, which is continuously wound in a cylindrical winding chamber (1) between two end flanges (2, 3) in several solenoid-like layers is characterized in that the section comprises an axial region of reduced current density (=notch region (10)), and the winding layers (6, 9) have hollow cylindrical blind regions (4a, 4b, 4c) which are filled with filler and which have different axial lengths, and radially sequential blind regions (4a, 4b, 4c) each alternately abut one of the two end flanges (2, 3) and are each radially separated from each other by at least one continuous winding layer (7), wherein the axial overlapping region of the blind regions (4a, 4b, 4c) forms the notch region (10). The inventive device thereby realizes a magnet coil configuration comprising a strip conductor which has a notch region for correcting inhomogeneities, wherein the mechanical load on the strip conductor is minimized.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: January 8, 2008
    Assignee: Bruker Biospin GmbH
    Inventors: Gerhard Roth, Volker Niemann, Klaus Schlenga
  • Patent number: 7310034
    Abstract: A superconducting magnet coil configuration has at least one section containing a superconducting strip conductor which is wound in several layers like a solenoid in a cylindrical winding chamber (1) between two end flanges (2, 3), characterized in that the radially innermost layers of the section consist of metallic low-temperature superconductors (LTS) (LTS layers (8)) and radially adjacent layers of the section are formed from high-temperature superconductor (HTS) material (HTS layers (9)). The invention proposes a magnet coil configuration using HTS material which has a notch structure for correcting inhomogeneities and homogenizing a compact high-field magnet, wherein the mechanical load on the HTS strip conductor is minimized.
    Type: Grant
    Filed: August 31, 2005
    Date of Patent: December 18, 2007
    Assignee: Bruker Biospin GmbH
    Inventors: Klaus Schlenga, Volker Niemann, Gerhard Roth
  • Patent number: 7215230
    Abstract: A method for calculating the shape of a band-shaped superconductor (3) of a solenoid-shaped coil section of a high-field magnet coil (1) in a transfer region (5) is characterized in that the band-shaped superconductor (3) is changed in the transfer region from a first orientation (3a) tangentially flatly abutting on the surface of a cylindrical coil body (2) and substantially perpendicular to the longitudinal direction of the cylindrical coil body (2) to a second orientation (3b) with its narrow side seating on the surface of the cylindrical coil body and parallel to the longitudinal direction (or vice versa).
    Type: Grant
    Filed: December 9, 2003
    Date of Patent: May 8, 2007
    Assignee: Bruker Biospin GmbH
    Inventors: Volker Niemann, Klaus Schlenga
  • Publication number: 20070008055
    Abstract: A superconducting magnet coil configuration comprising at least one section of a superconducting strip conductor, which is continuously wound in a cylindrical winding chamber (1) between two end flanges (2, 3) in several solenoid-like layers is characterized in that the section comprises an axial region of reduced current density (=notch region (10)), and the winding layers (6, 9) have hollow cylindrical blind regions (4a, 4b, 4c) which are filled with filler and which have different axial lengths, and radially sequential blind regions (4a, 4b, 4c) each alternately abut one of the two end flanges (2, 3) and are each radially separated from each other by at least one continuous winding layer (7), wherein the axial overlapping region of the blind regions (4a, 4b, 4c) forms the notch region (10). The inventive device thereby realizes a magnet coil configuration comprising a strip conductor which has a notch region for correcting inhomogeneities, wherein the mechanical load on the strip conductor is minimized.
    Type: Application
    Filed: August 31, 2005
    Publication date: January 11, 2007
    Applicant: Bruker BioSpin GmbH
    Inventors: Gerhard Roth, Volker Niemann, Klaus Schlenga
  • Publication number: 20060152315
    Abstract: A superconducting magnet coil configuration has at least one section containing a superconducting strip conductor which is wound in several layers like a solenoid in a cylindrical winding chamber (1) between two end flanges (2, 3), characterized in that the radially innermost layers of the section consist of metallic low-temperature superconductors (LTS) (LTS layers (8)) and radially adjacent layers of the section are formed from high-temperature superconductor (HTS) material (HTS layers (9)). The invention proposes a magnet coil configuration using HTS material which has a notch structure for correcting inhomogeneities and homogenizing a compact high-field magnet, wherein the mechanical load on the HTS strip conductor is minimized.
    Type: Application
    Filed: August 31, 2005
    Publication date: July 13, 2006
    Applicant: Bruker BioSpin GmbH
    Inventors: Klaus Schlenga, Volker Niemann, Gerard Roth