Patents Examined by G. M. Hyder
  • Patent number: 10871530
    Abstract: Methods and apparatus for reducing noise in RF signal chain circuitry for a low-field magnetic resonance imaging system are provided. A switching circuit in the RF signal chain circuitry may include at least one field effect transistor (FET) configured to operate as an RF switch at an operating frequency of less than 10 MHz. A decoupling circuit may include tuning circuitry coupled across inputs of an amplifier and active feedback circuitry coupled between an output of the amplifier and an input of the amplifier, wherein the active feedback circuitry includes a feedback capacitor configured to reduce a quality factor of an RF coil coupled to the amplifier.
    Type: Grant
    Filed: May 21, 2019
    Date of Patent: December 22, 2020
    Assignee: Hyperfine Research, Inc.
    Inventors: Hadrien A. Dyvorne, Todd Rearick
  • Patent number: 10871538
    Abstract: The invention relates to a method of MR imaging of at least a portion of a body (10) placed in a main magnetic field within the examination volume of a MR device (1). It is an object of the invention to facilitate the planning of an arterial spin labeling (ASL) MR imaging session and to improve the image quality in perfusion weighted MR imaging. The method of the invention comprises the following steps: acquiring angiographic MR signal data by subjecting the portion of the examined body (10) to one or more MR angiography scans; deriving quantitative blood flow parameters from the angiographic MR signal data; —computing a labeling efficiency of an ASL sequence from the sequence parameters of the ASL sequence and from the quantitative blood flow parameters; optimizing the sequence parameters by maximizing the labeling efficiency; acquiring perfusion weighted MR signal data by subjecting the portion of the body to the ASL sequence; and—reconstructing a MR image from the perfusion weighted MR signal data.
    Type: Grant
    Filed: November 16, 2017
    Date of Patent: December 22, 2020
    Assignee: Koninklijke Philips N.V.
    Inventors: Michael Gunter Helle, Peter Boernert, Kim Cornelia Carolina Van De Ven
  • Patent number: 10866296
    Abstract: A plurality of subject parameter maps are acquired at high speed. In addition to using an imaging sequence for generating both a gradient echo and a spin echo in a single imaging sequence, one or more parameters such as the longitudinal relaxation time T1 and the apparent transverse relaxation time T2* are calculated using the gradient echo and another parameter such as true transverse relaxation time T2 is calculated using the spin echo. When a value of one parameter is calculated, a value of the parameter calculated at the time of calculating the other parameter can be used.
    Type: Grant
    Filed: October 11, 2017
    Date of Patent: December 15, 2020
    Assignee: HITACHI, LTD.
    Inventors: Yo Taniguchi, Hisaaki Ochi, Toru Shirai, Yoshihisa Sotome, Suguru Yokosawa, Tomoki Amemiya
  • Patent number: 10859648
    Abstract: Various systems are provided for magnetic resonance imaging (MRI). In one example, a method includes selecting a contour topology for operating a configurable radio frequency (RF) coil assembly, wherein the configurable RF coil assembly includes an array of conductive segments coupled via a plurality of switches, and the contour topology defines a configuration of one or more RF coil elements formed on the configurable RF coil assembly. The method further includes, during a receive mode, at least partially activating one or more subsets of switches of the plurality of switches according to the selected contour topology to form the one or more RF coil elements.
    Type: Grant
    Filed: April 1, 2019
    Date of Patent: December 8, 2020
    Assignee: GE Precision Healthcare LLC
    Inventors: Fraser John Laing Robb, Robert Steven Stormont, Victor Taracila, Dan Kenrick Spence
  • Patent number: 10859521
    Abstract: The present disclosure provides a method of measuring a percent solids content (PSC) of solids by mass in a slurry catalyst composition, where the solids include a catalyst. The method includes obtaining a first time domain (TD) 1H-nuclear magnetic resonance (NMR) spectrum using a time domain (TD)-NMR spectrometer and a test sample of the slurry catalyst composition from which a value of a voltage signal (a) that represents the slurry catalyst composition is determined. A second TD 1H-NMR spectrum using the TD NMR spectrometer is obtained for a neat sample of the suspension liquid for the solids of the slurry catalyst composition, where a value of a voltage signal (b) from the second TD 1H-NMR spectrum that represents the suspension liquid for the solids of the slurry catalyst composition is determined.
    Type: Grant
    Filed: November 15, 2017
    Date of Patent: December 8, 2020
    Assignee: Univation Technologies, LLC
    Inventors: Kishori Deshpande, Gian C. Gobbi, Nathan Rau
  • Patent number: 10859654
    Abstract: A method for determining quantitative parameters for dynamic contrast-enhanced MR data includes acquiring a set of contrast-enhanced MR data for a region of interest using a T1-weighted pulse sequence, generating at least one contrast concentration curve based on the set of contrast-enhanced MR data, accessing a comprehensive dictionary of contrast concentration curves and generating a grouped dictionary that has a plurality of groups based on the comprehensive dictionary. Each group includes a plurality of correlated contrast concentration curves and a group representative signal for the group. The method also includes comparing a contrast concentration curve with the group representative signal of each group to select a group, comparing the contrast concentration curve to the plurality of correlated contrast concentration curves in the selected group to identify a set of quantitative parameters for the concentration curve and generating a report including the set of quantitative parameter.
    Type: Grant
    Filed: March 12, 2019
    Date of Patent: December 8, 2020
    Assignee: CASE WESTERN RESERVE UNIVERSITY
    Inventors: Vikas Gulani, Satyam Ghodasara, Katherine Wright, Nicole Seiberlich, Mark A. Griswold
  • Patent number: 10859655
    Abstract: An imaging system includes determination of a first gradient-modulated offset-independent adiabaticity pulse associated with a first bandwidth and a first gradient strength, determination of a second gradient-modulated offset-independent adiabaticity pulse associated with a second bandwidth less than the first bandwidth and a second gradient strength less than the first gradient strength, determination of a third asymmetric adiabatic pulse based on the first gradient-modulated offset-independent adiabaticity pulse and the second gradient-modulated offset-independent adiabaticity pulse, and control of a radio frequency system and gradient system to apply the third asymmetric adiabatic pulse to patient tissue.
    Type: Grant
    Filed: April 16, 2019
    Date of Patent: December 8, 2020
    Assignee: Siemens Healthcare GmbH
    Inventors: Jin Jin, Xiaoming Bi, Fei Han
  • Patent number: 10859649
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes: a cylindrical magnetic pole for generating a static magnetic field in an imaging region; a cylindrical gradient magnetic field coil arranged on a radially inner side of the magnetic pole, coaxially with the magnetic pole to generate a dynamic magnetic field having a linear magnetic field strength in the imaging region; a cylindrical high frequency coil arranged on a radially inner side of the gradient magnetic field coil, coaxially with the magnetic pole and the gradient magnetic field coil to generate a high frequency magnetic field in the imaging region; and a computer system for processing signals to obtain images. The magnetic resonance imaging apparatus further includes at least two loop-shaped additional coils arranged on the radially outer side of the gradient magnetic field coil and having different electric current circulating direction.
    Type: Grant
    Filed: April 15, 2019
    Date of Patent: December 8, 2020
    Assignee: HITACHI, LTD.
    Inventors: Yukinobu Imamura, Akira Kurome, Takeshi Yatsuo
  • Patent number: 10852372
    Abstract: An MRI image with high image quality can be acquired regardless of a size of an examinee. An array coil includes: a coil unit in which a plurality of sub-coils which includes a loop coil portion in which a conductor having flexibility with a predetermined length is curved and which is adjusted to receive a magnetic resonance signal from an examinee are arranged at predetermined intervals; and a coil casing that is formed of a sheet-shaped material which expands and contracts in at least one direction and accommodates the coil unit therein. At least one position of each of the plurality of sub-coils is fixed to the coil casing and an inter-center distance between the sub-coils varies with expansion and contraction of the coil casing.
    Type: Grant
    Filed: April 15, 2019
    Date of Patent: December 1, 2020
    Assignee: HITACHI, LTD.
    Inventors: Kohjiro Iwasawa, Yosuke Otake, Kazuyuki Kato, Hisaaki Ochi
  • Patent number: 10845442
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry configured to generate a plurality of reference partial k-space data items based on the filling positions and reference k-space data, generate a plurality of difference k-space data items by taking differences between the partial k-space data items and the reference k-space data items to each of the frames, generate a plurality of difference images by applying the reconstruction processing respectively to the difference k-space data items, and generate a plurality of composite images by combining the reference image with each of the difference images.
    Type: Grant
    Filed: April 25, 2019
    Date of Patent: November 24, 2020
    Assignee: Canon Medical Systems Corporation
    Inventor: Hidenori Takeshima
  • Patent number: 10845439
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes processing circuitry. The processing circuitry generates positional information related to a positional relationship between a transmitter coil and a receiver coil based on a magnetic resonance signal received from a subject. The processing circuitry adjusts an irradiation intensity of an RF pulse to be irradiated on the subject in accordance with the positional information.
    Type: Grant
    Filed: March 21, 2019
    Date of Patent: November 24, 2020
    Assignee: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Shinji Mitsui, Masahiro Fukushima, Satoshi Imai, Miyuki Ota, Sadanori Tomiha
  • Patent number: 10845446
    Abstract: A system and method are provided for controlling a magnetic resonance imaging system to perform a gradient echo pulse sequence that includes varying a phase of an RF pulse of the gradient echo pulse sequence between repetitions and acquire complex MR data. The method includes processing the complex MR data to determine signal contributions from transverse relaxation (T2) in the subject, generating a quantitative T2 map of the subject using the signal contributions from T2 in the subject, and displaying the quantitative T2 map.
    Type: Grant
    Filed: April 24, 2019
    Date of Patent: November 24, 2020
    Assignee: WISCONSIN ALUMNI RESEARCH FOUNDATION
    Inventors: Scott B. Reeder, Xiaoke Wang
  • Patent number: 10838025
    Abstract: A radio-frequency system for a magnetic resonance apparatus has a local coil, a body coil, and an impedance adjusting shield. The body coil is wirelessly power-coupled with the local coil such that the body coil serves as a transmitting coil for radio-frequency signals and the local coil serves as a receiving coil for magnetic resonance signals. The local coil is disposed in an internal cavity of the impedance adjusting shield. An impedance of the local coil is adjusted by the impedance adjusting shield so as to match the impedance of the local coil and the body coil. The impedance adjusting shield has a frequency modulation element that adjusts the resonance frequency of the local coil. The body coil couples power to the local coil, and the impedance adjusting shield effectively reduces energy transmission efficiency loss caused by reflection, thereby improving energy transmission efficiency.
    Type: Grant
    Filed: April 25, 2019
    Date of Patent: November 17, 2020
    Assignee: Siemens Healthcare GmbH
    Inventors: Yan Li Chen, Shu Du, Markus Vester, Jian Min Wang
  • Patent number: 10838027
    Abstract: A magnetic resonance coil and a magnetic resonance imaging system using the same are provided. The magnetic resonance coil may include an antenna and a signal processor. The antenna may be configured to receive a radio frequency (RF) signal emitted from an object, wherein the antenna does not resonate with the RF signal. The signal processor may be coupled to the antenna configured to process the RF signal to generate a processed signal.
    Type: Grant
    Filed: January 23, 2020
    Date of Patent: November 17, 2020
    Assignee: SHANGHAI UNITED IMAGING HEALTHCARE CO., LTD.
    Inventors: Ling Ji, Shao Che, Yunlei Yao
  • Patent number: 10838329
    Abstract: An image heating apparatus includes first and second heat generating elements arranged adjacent to each other, and a control portion that controls power supplied to the first and second heat generating elements, and that is capable of individually controlling the first and second heat generating elements, the first and second heat generating elements being respectively controlled so as to maintain a control temperature. When an image exists in a second region on the recording material heated by the second heat generating element, and an image does not exist in a first region on the recording material heated by the first heat generating element, the control portion sets the control temperature of the second heat generating element, when heating the second region, in accordance with a distance between an end section of the image in the second region and a boundary of the first region and the second region.
    Type: Grant
    Filed: October 31, 2019
    Date of Patent: November 17, 2020
    Assignee: Canon Kabuskiki Kaisha
    Inventors: Masato Sako, Atsushi Iwasaki
  • Patent number: 10830853
    Abstract: A computer implemented method for measuring T1 in an anatomical region of interest during a dynamic procedure includes acquiring a reference MR image of the anatomical region of interest using a first flip angle. A first set of dynamic MR images of the anatomical region of interest are acquired using a second flip angle. The reference MR image and the first set are used to calculate a reference T1 value for tissue in the anatomical region of interest. During an intervention where the T1 value may change, a second set of dynamic MR images of the anatomical region of interest is acquired using the second flip angle. The reference MR image and the second set are used to calculate an estimated T1 value. The reference T1 value, the estimated T1 value, and the first and second flip angles may then be used to correct the estimated T1 value.
    Type: Grant
    Filed: April 19, 2019
    Date of Patent: November 10, 2020
    Assignees: Siemens Healthcare GmbH, University of Utah Research Foundation
    Inventors: Bryant Svedin, Dennis L. Parker, Allison Payne
  • Patent number: 10831141
    Abstract: Provided is an image forming apparatus capable of forming a desired image with high accuracy. The image forming apparatus includes: an endless belt configured to convey a sheet; a conveying roller configured to convey the endless belt while being driven by a drive source; a first sensor configured to detect a specific position on the endless belt; a second detecting sensor configured to detect the specific position on the endless belt; a tension roller, which is provided between those sensors, and is configured to support the endless belt in a tensioned state while applying a tensile force to the endless belt; and a control unit.
    Type: Grant
    Filed: January 22, 2020
    Date of Patent: November 10, 2020
    Assignee: Canon Kabushiki Kaisha
    Inventor: Masaki Maeno
  • Patent number: 10830855
    Abstract: In some aspects, the disclosed technology relates to free-breathing cine DENSE (displacement encoding with stimulated echoes) imaging. In some embodiments, self-gated free-breathing adaptive acquisition reduces free-breathing artifacts by minimizing the residual energy of the phase-cycled T1-relaxation signal, and the acquisition of the k-space data is adaptively repeated with the highest residual T1-echo energy. In some embodiments, phase-cycled spiral interleaves are identified at matched respiratory phases by minimizing the residual signal due to T1 relaxation after phase-cycling subtraction; image-based navigators (iNAVs) are reconstructed from matched phase-cycled interleaves that are comprised of the stimulated echo iNAVs (ste-iNAVs), wherein the ste-iNAVs are used for motion estimation and compensation of k-space data.
    Type: Grant
    Filed: March 28, 2019
    Date of Patent: November 10, 2020
    Assignee: University of Virginia Patent Foundation
    Inventors: Xiaoying Cai, Frederick H. Epstein
  • Patent number: 10823803
    Abstract: In a method for reconstructing contrast levels from magnetic resonance (MR) acquisitions using a parallel acquisition (PAT) technique, MR raw data for at least two contrast levels are generated or acquired, the raw data includes reference lines. Reference line images are reconstructed from the reference lines of the MR raw data for at least two of the contrast levels. A histogram analysis is implemented on the basis of the reference line images. A PAT reconstruction of image representations of the different contrast levels is implemented, wherein the decision as to which reference lines are used for the PAT reconstruction being made on the basis of the histogram analysis.
    Type: Grant
    Filed: April 15, 2019
    Date of Patent: November 3, 2020
    Assignee: Siemens Healthcare GmbH
    Inventors: Flavio Carinci, Dominik Paul
  • Patent number: 10824103
    Abstract: An image forming apparatus includes an image forming device that forms images in an image region on a sheet. An image fixing device includes heater elements disposed along a sheet-width direction. A controller is configured to identify a heater element that will overlap with an edge of the image region when a sheet is conveyed to the image fixing device. The controller calculates whether a shift of the image region by a shift amount less than a threshold would cause the heater element to not overlap. If so, the image forming device is controlled to form the image in a shifted image region and only those heater elements in the plurality of heater elements that overlap with the shifted image region are turned on when fixing the sheet if the image has been formed in the shifted image region.
    Type: Grant
    Filed: February 26, 2020
    Date of Patent: November 3, 2020
    Assignee: TOSHIBA TEC KABUSHIKI KAISHA
    Inventor: Yayoi Doi