Patents by Inventor Andrew Dewdney

Andrew Dewdney 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).

  • Patent number: 11112472
    Abstract: A gradient system characterization function (e.g., a gradient system transfer function) may be developed by measuring a behavior of the MR device at a target temperature and developing at least one gradient system characterization function for a gradient coil of a magnetic resonance (MR) device at the target temperature based on the measured behavior. A patient may be subsequently imaged by the MR device, wherein the imaging process comprises measuring a temperature of a gradient coil, determining a gradient system characterization function at the measured temperature, calculating a pre-emphasized gradient of the gradient coil, and imaging the patient using the pre-emphasized magnetic field component.
    Type: Grant
    Filed: November 29, 2019
    Date of Patent: September 7, 2021
    Assignees: Siemens Healthcare GmbH, Julius-Maximilians-Universität Würzburg, THE UNITED STATES OF AMERICA, as represented by the Secretary, Department of Health and Human Services
    Inventors: Gudrun Ruyters, Andrew Dewdney, Manuel Stich, Herbert Köstler, Christiane Pfaff, Tobias Wech, Adrienne Campbell
  • Publication number: 20200333410
    Abstract: The disclosure relates to methods, devices, and systems for developing gradient system characterization functions and imaging a patient using pre-emphasized magnetic field components in a magnetic resonance (MR) device, wherein the processes allow for a reduction in a number of artifacts when reconstructing the magnetic resonance image. The gradient system characterization function (e.g., a gradient system transfer function) may be developed by measuring a behavior of the MR device at a target temperature and developing at least one gradient system characterization function for a gradient coil of the MR device at the target temperature based on the measured behavior.
    Type: Application
    Filed: November 29, 2019
    Publication date: October 22, 2020
    Inventors: Gudrun Ruyters, Andrew Dewdney, Manuel Stich, Herbert Köstler, Christiane Pfaff, Tobias Wech, Adrienne Campbell-Washburn
  • Publication number: 20200241093
    Abstract: A magnetic resonance device (1), having a main magnet unit (2) with a cylindrical patient aperture (3), wherein at least one radial gradient coil (9) is provided in the patient aperture (3) which generates a gradient field having, at least in regions, a radial gradient in relation to its own central axis parallel to the longitudinal axis of the patient aperture (3), the radial gradient coil (9) being embodied as a cylinder coil.
    Type: Application
    Filed: January 29, 2020
    Publication date: July 30, 2020
    Applicant: Siemens Healthcare GmbH
    Inventors: Peter Dietz, Andrew Dewdney
  • Patent number: 10408902
    Abstract: A method for improving shim pre-settings of a magnetic resonance device and a magnetic resonance device are provided. Efficient computation of shim settings for magnetic resonance imaging is provided by the method. The method includes loading of shim pre-settings from a database, creating shim settings using the shim pre-settings for recording magnetic resonance image data of an examination object by a magnetic resonance device, and activating a shim unit of the magnetic resonance device for recording the magnetic resonance image data. The method also includes using the created shim settings, improving the shim pre-settings using the created shim settings, and storing the improved shim pre-settings in the database.
    Type: Grant
    Filed: July 9, 2015
    Date of Patent: September 10, 2019
    Assignee: Siemens Aktiengesellschaft
    Inventor: Andrew Dewdney
  • Patent number: 10401451
    Abstract: In a method for actuating a shim coil arrangement of a magnetic resonance data acquisition scanner that has a shim controller that operates said shim coil arrangement, and a gradient coil arrangement operated by a gradient controller, the gradient controller determine a gradient pulse shape, in accordance with specifications of a magnetic resonance data acquisition sequence, that is activated by the gradient coil arrangement, when the sequence is executed in said scanner. A modifies the gradient pulse shape and provides the modified gradient pulse shape to the shim controller and the shim controller generates shim settings dependent on the modified gradient pulse shape, and actuates said shim coil arrangement according to the shim settings during activation of the gradient pulse shape by the gradient coil arrangement during execution of the sequence in said scanner.
    Type: Grant
    Filed: November 9, 2016
    Date of Patent: September 3, 2019
    Assignee: Siemens Healthcare GmbH
    Inventors: Andrew Dewdney, Eva Eberlein, Andreas Krug
  • Patent number: 10393829
    Abstract: A method for determining a position of a mobile device relative to a B0 field magnet along a z-coordinate axis, and a device and a magnetic resonance tomography unit for performing the method are provided. The device includes a magnetic field strength sensor arranged in a fixed relative position. A characteristic magnetic field strength Bref of the B0 field magnet that emerges for a plurality of x-y coordinate pairs with a same reference z-coordinate zref is ascertained. The device is moved along the z-coordinate axis until the magnetic field strength sensor measures the characteristic magnetic field strength Bref.
    Type: Grant
    Filed: February 28, 2017
    Date of Patent: August 27, 2019
    Assignee: Siemens Healthcare GmbH
    Inventors: Klaus Ludwig, Volker Schnetter, Johann Sukkau, Andrew Dewdney, Axel Heitland, Ralf Ladebeck, Ronny Pflichtbeil, Jörg Rothard, Volker Weißenberger
  • Patent number: 10386431
    Abstract: A magnetic resonance tomography system has a frequency control device for temperature compensation, a temperature sensor, and a high frequency generator. An output frequency of an output signal from the high frequency generator is dependent on a value of a digital frequency variable, and a synthesis signal with the system frequency is generated dependent on the output signal. A temperature change is detected using the temperature sensor, a temperature-time function of the temperature is determined using the temperature change that has been detected, a time is determined at which a change in the digital frequency variables in the least significant bit brings about a change in the frequency of the synthesis signal that corresponds with a change in the system frequency due to a temperature, according to the interpolated temperature-time function, and the digital frequency variable in the least significant bit is changed at the specified time.
    Type: Grant
    Filed: September 7, 2017
    Date of Patent: August 20, 2019
    Assignee: Siemens Healthcare GmbH
    Inventors: Rudi Baumgartl, Andrew Dewdney
  • Patent number: 10197650
    Abstract: In a method, device and magnetic resonance apparatus for determining basic shim settings for shim elements of a magnetic resonance scanner of the apparatus, an optimization function is established in a processor, which includes multiple optimization parameters, including a first optimization parameter that designates a homogeneity value of a spatial distribution of the basic magnetic field in the scanner, and a second optimization parameter that designates a value of a force acting on the shim elements. The processor is configured to calculate the spatial distribution of the shim elements by minimizing the optimization function, dependent on the first and second parameters. Shim settings for the scanner are determined using the calculated spatial distribution of the shim elements.
    Type: Grant
    Filed: November 25, 2015
    Date of Patent: February 5, 2019
    Assignee: Siemens Aktiengesellschaft
    Inventor: Andrew Dewdney
  • Publication number: 20180074141
    Abstract: A magnetic resonance tomography system has a frequency control device for temperature compensation, a temperature sensor, and a high frequency generator. A system frequency of the magnetic resonance tomography system has a temperature dependence on a temperature. An output frequency of an output signal from the high frequency generator is dependent on a value of a digital frequency variable, and a synthesis signal with the system frequency is generated dependent on the output signal.
    Type: Application
    Filed: September 7, 2017
    Publication date: March 15, 2018
    Inventors: Rudi Baumgartl, Andrew Dewdney
  • Patent number: 9880237
    Abstract: A magnetic resonance imaging (MRI) scanner includes a control device, a gradient coil for generating a gradient field, a gradient coil connector for connecting the gradient coil to the control device, and a temperature sensor. The temperature sensor is configured and disposed to detect a temperature of the gradient coil connector.
    Type: Grant
    Filed: September 26, 2013
    Date of Patent: January 30, 2018
    Assignee: Siemens Aktiengesellschaft
    Inventor: Andrew Dewdney
  • Publication number: 20170248665
    Abstract: A method for determining a position of a mobile device relative to a B0 field magnet along a z-coordinate axis, and a device and a magnetic resonance tomography unit for performing the method are provided. The device includes a magnetic field strength sensor arranged in a fixed relative position. A characteristic magnetic field strength Bref of the B0 field magnet that emerges for a plurality of x-y coordinate pairs with a same reference z-coordinate zref is ascertained. The device is moved along the z-coordinate axis until the magnetic field strength sensor measures the characteristic magnetic field strength Bref.
    Type: Application
    Filed: February 28, 2017
    Publication date: August 31, 2017
    Inventors: Klaus Ludwig, Volker Schnetter, Johann Sukkau, Andrew Dewdney, Axel Heitland, Ralf Ladebeck, Ronny Pflichtbeil, Jörg Rothard, Volker Weißenberger
  • Patent number: 9709647
    Abstract: A method for operating a mobile magnetic resonance tomography system having magnets and/or coils generating a magnetic field and a shield surrounding the magnets and/or coils is intended to enable an optimal image quality during the examination and at the same time have a small space requirement. For this purpose, a temperature is measured at a plurality of points on the shield by a temperature measuring system, where measured data of the temperature measuring system is sent to a compensation system, and where effects of temperature differences on the homogeneity of the magnetic field are compensated by the compensation system.
    Type: Grant
    Filed: May 13, 2014
    Date of Patent: July 18, 2017
    Assignee: Siemens Aktiengesellschaft
    Inventors: Andrew Dewdney, Matthias Drobnitzky, Ralf Ladebeck
  • Publication number: 20170131372
    Abstract: In a method for actuating a shim coil arrangement of a magnetic resonance data acquisition scanner that has a shim controller that operates said shim coil arrangement, and a gradient coil arrangement operated by a gradient controller, the gradient controller determine a gradient pulse shape, in accordance with specifications of a magnetic resonance data acquisition sequence, that is activated by the gradient coil arrangement, when the sequence is executed in said scanner. A modifies the gradient pulse shape and provides the modified gradient pulse shape to the shim controller and the shim controller generates shim settings dependent on the modified gradient pulse shape, and actuates said shim coil arrangement according to the shim settings during activation of the gradient pulse shape by the gradient coil arrangement during execution of the sequence in said scanner.
    Type: Application
    Filed: November 9, 2016
    Publication date: May 11, 2017
    Applicant: Siemens Healthcare GmbH
    Inventors: Andrew Dewdney, Eva Eberlein, Andreas Krug
  • Publication number: 20160282431
    Abstract: In a method and magnetic resonance apparatus for correcting field drifts of a higher order than the zeroth order that occur due to the operation of gradient coils in a magnetic resonance scanner while recording magnetic resonance data, at least one temperature sensor is used to determine the gradient coil temperature directly on the gradient coils, and as a function of the gradient coil temperature, at least one field variable describing at least one part of the field drifts is determined, and the field drifts are corrected by the actuation of the gradient coils and/or shim coils being modified in order to compensate for field drifts described by the field variable, and/or the acquired magnetic resonance data are corrected in post-processing as to the effects of the field drifts described by the field variable.
    Type: Application
    Filed: March 23, 2016
    Publication date: September 29, 2016
    Applicant: Siemens Aktiengesellschaft
    Inventor: Andrew Dewdney
  • Patent number: 9423478
    Abstract: A magnetic shield for a field magnet of a magnetic resonance system is provided. A magnet apparatus with a field magnet for a magnetic resonance system with active shielding and a magnetic shield, wherein the magnetic shield forms a hollow body which accommodates the field magnets is also provided. A wall of the hollow body has a first, a second and a third area, which are disposed along the axis. In this case the second area separates the first area and the third area from one another and has a smaller wall thickness than the first and the third area.
    Type: Grant
    Filed: August 29, 2013
    Date of Patent: August 23, 2016
    Assignee: SIEMENS HEALTHCARE GMBH
    Inventors: Andrew Dewdney, Matthias Drobnitzky, Bernhard Heinrich
  • Publication number: 20160154076
    Abstract: In a method, device and magnetic resonance apparatus for determining basic shim settings for shim elements of a magnetic resonance scanner of the apparatus, an optimization function is established in a processor, which includes multiple optimization parameters, including a first optimization parameter that designates a homogeneity value of a spatial distribution of the basic magnetic field in the scanner, and a second optimization parameter that designates a value of a force acting on the shim elements. The processor is configured to calculate the spatial distribution of the shim elements by minimizing the optimization function, dependent on the first and second parameters. Shim settings for the scanner are determined using the calculated spatial distribution of the shim elements.
    Type: Application
    Filed: November 25, 2015
    Publication date: June 2, 2016
    Applicant: Siemens Aktiengesellschaft
    Inventor: Andrew Dewdney
  • Publication number: 20160011287
    Abstract: A method for improving shim pre-settings of a magnetic resonance device and a magnetic resonance device are provided. Efficient computation of shim settings for magnetic resonance imaging is provided by the method. The method includes loading of shim pre-settings from a database, creating shim settings using the shim pre-settings for recording magnetic resonance image data of an examination object by a magnetic resonance device, and activating a shim unit of the magnetic resonance device for recording the magnetic resonance image data. The method also includes using the created shim settings, improving the shim pre-settings using the created shim settings, and storing the improved shim pre-settings in the database.
    Type: Application
    Filed: July 9, 2015
    Publication date: January 14, 2016
    Inventor: Andrew Dewdney
  • Publication number: 20140354277
    Abstract: A method for operating a mobile magnetic resonance tomography system having magnets and/or coils generating a magnetic field and a shield surrounding the magnets and/or coils is intended to enable an optimal image quality during the examination and at the same time have a small space requirement. For this purpose, a temperature is measured at a plurality of points on the shield by a temperature measuring system, where measured data of the temperature measuring system is sent to a compensation system, and where effects of temperature differences on the homogeneity of the magnetic field are compensated by the compensation system.
    Type: Application
    Filed: May 13, 2014
    Publication date: December 4, 2014
    Inventors: Andrew Dewdney, Matthias Drobnitzky, Ralf Ladebeck
  • Publication number: 20140084917
    Abstract: A magnetic resonance imaging (MRI) scanner includes a control device, a gradient coil for generating a gradient field, a gradient coil connector for connecting the gradient coil to the control device, and a temperature sensor. The temperature sensor is configured and disposed to detect a temperature of the gradient coil connector.
    Type: Application
    Filed: September 26, 2013
    Publication date: March 27, 2014
    Inventor: Andrew Dewdney
  • Publication number: 20140062483
    Abstract: A magnetic shield for a field magnet of a magnetic resonance system is provided. A magnet apparatus with a field magnet for a magnetic resonance system with active shielding and a magnetic shield, wherein the magnetic shield forms a hollow body which accommodates the field magnets is also provided. A wall of the hollow body has a first, a second and a third area, which are disposed along the axis. In this case the second area separates the first area and the third area from one another and has a smaller wall thickness than the first and the third area.
    Type: Application
    Filed: August 29, 2013
    Publication date: March 6, 2014
    Inventors: Andrew Dewdney, Matthias Drobnitzky, Bernhard Heinrich