Patents by Inventor G. Randy Duensing

G. Randy Duensing 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: 20090224763
    Abstract: Embodiments of the invention relate to methods and apparatus for lossless, or low loss, coupling for many channel RF coil arrays. Non-invertible noise can be converted to invertible noise. Specific embodiments pertain to methods and apparatus for magnetic resonance imaging (MRI) with many channel RF coil arrays. Specific embodiments pertain to methods and apparatus for matching one or more preamplifiers to associated coils in an MRI array and tuning the MRI coil array. Embodiments of the invention can incorporate matching of the coil to the impedance of the preamplifier.
    Type: Application
    Filed: December 8, 2008
    Publication date: September 10, 2009
    Applicant: Koninklijke Philips Electronics N.V.
    Inventor: G. Randy Duensing
  • Patent number: 7576536
    Abstract: The subject invention pertains to method and apparatus for parallel imaging. The subject method can be utilized with imaging systems utilizing parallel imaging techniques. In a specific embodiment, the subject invention can be used in magnetic resonance imaging (MRI). A specific embodiment of the subject invention can reduce parallel reconstruction CPU and system resources usage by reducing the number of channels employed in the parallel reconstruction from the M channel signals to a lower number of channel signals. In a specific embodiment, sensitivity map information can be used in the selection of the M channel signals to be used, and how the selected channel signals are to be combined, to create the output channel signals. In an embodiment, for a given set of radio-frequency (RF) elements, an optimal choice of reconstructed channel modes can be made using prior view information and/or sensitivity data for the given slice. The subject invention can utilize parallel imaging speed up in multiple directions.
    Type: Grant
    Filed: May 8, 2006
    Date of Patent: August 18, 2009
    Assignee: Invivo Corporation
    Inventors: James Akao, G. Randy Duensing, Feng Huang
  • Publication number: 20090191531
    Abstract: The subject invention relates to a method and apparatus for synchronization of sensory stimulation with the reading experience. In a specific embodiment, audio and/or video stimulation can be provided to a reader. In additional embodiments, the sensory stimulation can include touch, smell, and/or taste. The reading experience can include, for example, the reading of books, magazines, textbooks, telephone directories, maps, resumes, brochures, newspapers, or other forms of written or printed materials, which can include, but are not limited to, words, photographs, illustrations, drawings, cartoons, and braille. The synchronization of sensory stimulation with the reading experience can involve providing sensory stimulation in relation to a reader's location or approximate location with respect to written or printed materials. In addition to sensory stimulation, other forms of interaction can be provided, such as interactive games, or interactive tests.
    Type: Application
    Filed: December 22, 2008
    Publication date: July 30, 2009
    Inventors: Joseph Saccocci, G. Randy Duensing
  • Publication number: 20080278165
    Abstract: Embodiments of the invention pertain to a method and apparatus for image reconstruction for parallel Magnetic Resonance Imaging (MRI). In a specific embodiment, a method for image reconstruction in image space is provided. The method can suppress aliasing caused by undersampling when the number of sampling lines in k-space is reduced to increase the imaging speed. In an embodiment, suppressing aliasing from under-sampling can improve the quality of images reconstructed from the data acquired using a MRI coil array. In an embodiment, the method operates in image space and achieves a good resolution. In the reconstruction, the sum of square errors can be minimized within a region of interest, which can allow the image reconstruction to be optimized in a particular imaging region of interest by sacrificing the reconstruction of other regions. In a further embodiment, image reconstruction can be implemented region by region, allowing global optimization by spending a longer time in reconstruction.
    Type: Application
    Filed: April 18, 2008
    Publication date: November 13, 2008
    Inventors: Yu Li, Feng Huang, G. Randy Duensing
  • Publication number: 20080154116
    Abstract: Embodiments of the subject invention relate to a method and apparatus for obtaining an electrocardiogram (ECG) signal. Embodiments can separate a true ECG signal from one or more signals due to electric fields caused by moving electrical charges. In a specific embodiment, an ECG signal can be separated from one or more electric fields caused by blood flow. An embodiment pertains to a joint MRI and diagnostic ECG system. In an embodiment, the joint diagnostic quality ECG can add information to a MRI cardiac study. This additional information can be useful for MR guided intervention treatments, such as locating tissue that created bad electrical arrhythmia. In an embodiment, the subject method and apparatus can be utilized to obtain an ECG for patient located in a magnetic field of 1.5 T or higher, such as in MRI systems with 1.5 T or higher magnetic fields.
    Type: Application
    Filed: December 22, 2006
    Publication date: June 26, 2008
    Inventors: G. Randy Duensing, Charles A. Saylor
  • Patent number: 7233147
    Abstract: The subject invention pertains to a method and apparatus utilizing one or more spiral coils, such as spiral birdcage coils, spiral saddle coils, Helmholtz coil pairs, and other spiral volume and spiral surface coils. The spiral coils of the subject array can be substantially isolated from each other while covering nearly the same volume or surface. For cylindrical geometrics, isolation can be enhanced by having the rotation, or change in direction from one end of the coil to the other, be 2n?, where n is an integer.
    Type: Grant
    Filed: July 22, 2002
    Date of Patent: June 19, 2007
    Assignee: Invivo Corporation
    Inventor: G. Randy Duensing
  • Patent number: 7230429
    Abstract: The subject invention pertains to a method and apparatus for producing sensitivity maps with respect to medical imaging. The subject invention relates to a method for applying an inpainting model to correct images in parallel imaging. Some images, such as coil sensitivity maps and intensity correction maps, have no signal at some places and may have noise. Advantageously, the subject invention allows an accurate method to fill in holes in sensitivity maps, where holes can arise when, for example, the pixel intensity magnitudes for two images being used to create the sensitivity map are zero. A specific embodiment of the subject invention can accomplish de-noise, interpolation, and extrapolation simultaneously for these types of maps such that the local texture can be carefully protected.
    Type: Grant
    Filed: January 24, 2005
    Date of Patent: June 12, 2007
    Assignee: Invivo Corporation
    Inventors: Feng Huang, G. Randy Duensing, Yunmei Chen
  • Patent number: 7215122
    Abstract: The subject invention relates to a method and apparatus for producing stimulated MRI data. In an embodiment, a remote-controlled “smart phantom” can produce simulated data. The simulated data can be acquired from a MRI system. The subject device can generate control signals and send the generated control signals to secondary coils/probes placed in the subject smart phantom. The control signals determine the current flow in the secondary coils/probes, which act as local spin magnetization amplifiers and thus produce regions of variable contrast to noise ratio. The control signals can be generated with various parameters, such as BOLD models, different levels of contrast-to-noise ratio (CNR), signal intensities, and physiological signals. Comparisons can be made with the widely-used simulated data by computers. Validation of the subject smart phantom can be performed with both theoretical analysis and data of human subjects.
    Type: Grant
    Filed: October 4, 2004
    Date of Patent: May 8, 2007
    Assignee: Invivo Corporation
    Inventors: Qun Zhao, G. Randy Duensing, Hu Cheng, William A. Edelstein
  • Patent number: 7166999
    Abstract: The subject invention pertains to methods and apparatus for producing excitation for magnetic resonance imaging (MRI) from a plurality of local exciting elements such that each local exciting element's excitation is independent of the other local exciting elements' excitation. The methods and apparatus of the subject invention can be utilized in magnetic resonance imaging (MRI) and in magnetic resonance spectroscopy (MRS), where MRI produces a magnitude for each pixel that combines many frequency components, typically for magnitude images, and MRS produces a spectrum of outputs over a range of frequencies for each pixel, typically a spectral output. The subject method and apparatus can be utilized for exciting proton, and/or other imaging materials relating to spin magnetization, such as, but not limited to, phosphorous, carbon, and fluorine.
    Type: Grant
    Filed: March 7, 2005
    Date of Patent: January 23, 2007
    Assignee: Invivo Corporation
    Inventor: G. Randy Duensing
  • Patent number: 7145339
    Abstract: The subject invention pertains to a technique and device that can isolate and separate resultant electromagnetic fields of volume coils at high frequency. In an embodiment, an RF shield can be used to isolate and separate resultant electromagnetic fields. In an embodiment, the shield can have a cylindrical shape that can form a partially closed volume in which an object to be imaged, or sample, can be inserted. In an embodiment, the RF shield can be part of a RF coil. In a specific embodiment, some parts of a volume coil can be inside a shield, and the other parts of a volume coil can be outside the shield. The shielding of some of the parts of a volume coil can create conductor patterns corresponding to the specific parts inside the shield and the specific parts outside the shield. In an embodiment, two or more conductor patterns can be placed in proximity to the same shield and either be driven independently, driven together, or act as receiving elements, combined or uncombined.
    Type: Grant
    Filed: October 7, 2005
    Date of Patent: December 5, 2006
    Assignee: Invivo Corporation
    Inventors: Charles A. Saylor, G. Randy Duensing
  • Patent number: 7141971
    Abstract: The subject invention pertains to a method and apparatus for enhanced multiple coil imaging. The subject invention is advantageous for use in imaging devices, such as MRIs where multiple images can be combined to form a single composite image. In one specific embodiment, the subject method and apparatus utilize a novel process of converting from the original signal vector in the time domain to allow the subject invention to be installed in-line with current MRI devices.
    Type: Grant
    Filed: November 8, 2005
    Date of Patent: November 28, 2006
    Assignee: Invivo Corporation
    Inventors: G. Randy Duensing, Steve Varosi, Scott B. King
  • Patent number: 7057387
    Abstract: The subject invention pertains to a method and apparatus for enhanced multiple coil imaging. The subject invention is advantageous for use in imaging devices, such as MRIs where multiple images can be combined to form a single composite image. In one specific embodiment, the subject method and apparatus utilize a novel process of converting from the original signal vector in the time domain to allow the subject invention to be installed in-line with current MRI devices.
    Type: Grant
    Filed: June 18, 2002
    Date of Patent: June 6, 2006
    Assignee: Invivo Corporation
    Inventors: G. Randy Duensing, Steve Varosi, Scott B. King
  • Patent number: 6894496
    Abstract: The subject invention pertains to a method and apparatus for Nuclear Magnetic Resonance (NMR) imaging. The subject method and apparatus are advantageous with respect to the use of RF coils for receiving signals in NMR scanners. The subject invention can utilize multiple coils to, for example, improve the signal to noise, increase the coverage area, and/or reduce the acquisition time. The use of multiple smaller surface or volume coils to receive NMR signals from the sample can increase the signal to noise ratio compared to a larger coil that has the same field of view and coverage area.
    Type: Grant
    Filed: June 25, 2003
    Date of Patent: May 17, 2005
    Assignee: MRI Devices Corp.
    Inventors: David A. Molyneaux, G. Randy Duensing, S. Uli Gotshal, Thomas E. Schubert, Alan Holland, Scott B. King
  • Patent number: 6865494
    Abstract: The subject invention pertains to an imaging technique and apparatus which can utilize an array of RF probes to measure the non-resonant thermal noise which is produced within a sample, such as a body, and produce a non-resonant thermal noise correlation. The detected noise correlation is a function of the spatial overlap of the electromagnetic fields of the probes and the spatial distribution of the conductivity of the sample. The subject technique, which can be referred to as Noise Tomography (NT), can generate a three-dimensional map of the conductivity of the sample. Since the subject invention utilizes detection of the thermal noise generated within the body, the subject method can be non-invasive and can be implemented without requiring external power, chemicals, or radionuclides to be introduced into the body. The subject imaging method can be used as a stand along technique or can be used in conjunction with other imaging techniques.
    Type: Grant
    Filed: December 18, 2002
    Date of Patent: March 8, 2005
    Assignee: MRI Devices Corp.
    Inventors: G. Randy Duensing, Charles Saylor, Feng Huang
  • Patent number: 6836118
    Abstract: The subject invention pertains to a method and apparatus for Nuclear Magnetic Resonance (NMR) imaging. The subject method and apparatus are advantageous with respect to the use of RF coils for receiving signals in NMR scanners. The subject invention can utilize multiple coils to, for example, improve the signal to noise, increase the coverage area, and/or reduce the acquisition time. The use of multiple smaller surface or volume coils to receive NMR signals from the sample can increase the signal to noise ratio compared to a larger coil that has the same field of view and coverage area.
    Type: Grant
    Filed: March 10, 2000
    Date of Patent: December 28, 2004
    Assignee: MRI Devices Corp.
    Inventors: David A. Molyneaux, G. Randy Duensing, S. Uli Gotshal, Thomas E. Schubert, Alan Holland, Scott B. King
  • Publication number: 20040212366
    Abstract: The subject invention pertains to a method and apparatus for Nuclear Magnetic Resonance (NMR) imaging. The subject method and apparatus are advantageous with respect to the use of RF coils for receiving signals in NMR scanners. The subject invention can utilize multiple coils to, for example, improve the signal to noise, increase the coverage area, and/or reduce the acquisition time. The use of multiple smaller surface or volume coils to receive NMR signals from the sample can increase the signal to noise ratio compared to a larger coil that has the same field of view and coverage area.
    Type: Application
    Filed: March 10, 2000
    Publication date: October 28, 2004
    Inventors: David A. Molyneaux, G. Randy Duensing, S. Uli Gotshal, Thomas E. Schubert, Alan Holland, Scott B. King
  • Publication number: 20040000908
    Abstract: The subject invention pertains to a method and apparatus for Nuclear Magnetic Resonance (NMR) imaging. The subject method and apparatus are advantageous with respect to the use of RF coils for receiving signals in NMR scanners. The subject invention can utilize multiple coils to, for example, improve the signal to noise, increase the coverage area, and/or reduce the acquisition time. The use of multiple smaller surface or volume coils to receive NMR signals from the sample can increase the signal to noise ratio compared to a larger coil that has the same field of view and coverage area.
    Type: Application
    Filed: June 25, 2003
    Publication date: January 1, 2004
    Inventors: David A. Molyneaux, G. Randy Duensing, S. Uli Gotshal, Thomas E. Schubert, Alan Holland, Scott B. King
  • Publication number: 20030160622
    Abstract: The subject invention pertains to an imaging technique and apparatus which can utilize an array of RF probes to measure the non-resonant thermal noise which is produced within a sample, such as a body, and produce a non-resonant thermal noise correlation. The detected noise correlation is a function of the spatial overlap of the electromagnetic fields of the probes and the spatial distribution of the conductivity of the sample. The subject technique, which can be referred to as Noise Tomography (NT), can generate a three-dimensional map of the conductivity of the sample. Since the subject invention utilizes detection of the thermal noise generated within the body, the subject method can be non-invasive and can be implemented without requiring external power, chemicals, or radionuclides to be introduced into the body. The subject imaging method can be used as a stand along technique or can be used in conjunction with other imaging techniques.
    Type: Application
    Filed: December 18, 2002
    Publication date: August 28, 2003
    Inventors: G. Randy Duensing, Charles Saylor, Feng Huang
  • Publication number: 20030038632
    Abstract: The subject invention pertains to a method and apparatus for enhanced multiple coil imaging. The subject invention is advantageous for use in imaging devices, such as MRIs where multiple images can be combined to form a single composite image. In one specific embodiment, the subject method and apparatus utilize a novel process of converting from the original signal vector in the time domain to allow the subject invention to be installed in-line with current MRI devices.
    Type: Application
    Filed: June 18, 2002
    Publication date: February 27, 2003
    Inventors: G. Randy Duensing, Steve Varosi, Scott B. King
  • Publication number: 20030020476
    Abstract: The subject invention pertains to a method and apparatus utilizing one or more spiral coils, such as spiral birdcage coils, spiral saddle coils, Helmholtz coil pairs, and other spiral volume and spiral surface coils. The spiral coils of the subject array can be substantially isolated from each other while covering nearly the same volume or surface. For cylindrical geometrics, isolation can be enhanced by having the rotation, or change in direction from one end of the coil to the other, be 2n&pgr;, where n is an integer.
    Type: Application
    Filed: July 22, 2002
    Publication date: January 30, 2003
    Inventor: G. Randy Duensing