Patents by Inventor Hiroshi Takai

Hiroshi Takai 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: 20190113588
    Abstract: A magnetic resonance imaging apparatus according to the present embodiment includes sequence control circuitry. The sequence control circuitry collect first MR data in a first cardiac cycle by excitation of a first region including a first slice, and collects reference data used for phase correction of second MR data on a second slice not included in the first region before and after the collection of the first MR data in the first cardiac cycle.
    Type: Application
    Filed: October 1, 2018
    Publication date: April 18, 2019
    Applicant: Canon Medical Systems Corporation
    Inventors: Takahiro TAMURA, Hiroshi TAKAI, Nobuyuki KONUMA
  • Patent number: 10175329
    Abstract: A magnetic resonance imaging apparatus according to an embodiment includes: an obtaining unit, a correction coefficient deriving unit, an amplification degree deriving unit, and a filtering processing unit. The obtaining unit obtains a distribution of a radio frequency magnetic field. The correction coefficient deriving unit derives, on a basis of the distribution of the radio frequency magnetic field, a transmission correction coefficient used for correcting a transmission unevenness. The amplification degree deriving unit derives, for each of pixels, an amplification degree by which noise components are amplified in the image due to the correction, on the basis of either the distribution of the radio frequency magnetic field or the transmission correction coefficient. The filtering processing unit performs a filtering process according to the amplification degree on each of the pixels in the image to which the correction is applied.
    Type: Grant
    Filed: June 12, 2014
    Date of Patent: January 8, 2019
    Assignee: TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventors: Junichi Kachi, Hiroshi Takai, Yoshiteru Watanabe, Yoshinari Morita, Kazuya Tanoue
  • Patent number: 9846216
    Abstract: According to one embodiment, an MRI apparatus includes a data acquiring unit and processing circuitry. The data acquiring unit acquires MR signals for imaging according to data acquiring conditions for acquiring MR signals multiple times following one excitation. The data acquiring unit also acquires reference MR signals for phase correction of real space data for imaging. The real space data are generated based on the MR signals for imaging. The processing circuitry is configured to calculate a phase error, in a real space region, of reference real space data and generate MR image data based on the MR signals for imaging with the phase correction of the real space data for imaging based on the calculated phase error. The reference real space data are generated based on the reference MR signals. The real space region is determined based on conditions of acquiring the reference MR signals or the like.
    Type: Grant
    Filed: September 25, 2015
    Date of Patent: December 19, 2017
    Assignee: TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventors: Yoshinari Morita, Hiroshi Takai, Yoshiteru Watanabe, Takashi Shigeta
  • Patent number: 9301706
    Abstract: A magnetic resonance imaging system uses a first RF coil for acquiring a magnetic resonance signal from a subject, and a device for estimating a cardiac phase of the subject based on the magnetic resonance signal acquired by the first RF coil. The first RF coil, for example, can be an RF coil exclusive to cardiac phase estimation. The magnetic resonance imaging system also uses a second RF coil for acquiring a magnetic resonance signal based on the estimated cardiac phase, and a device for reconstructing a magnetic resonance image of the subject based on the magnetic resonance signal acquired by the second RF coil. Thus, MRA can be performed by estimating a cardiac phase.
    Type: Grant
    Filed: October 23, 2013
    Date of Patent: April 5, 2016
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventors: Hiroshi Takai, Yoshimori Kassai
  • Patent number: 9301704
    Abstract: A magnetic resonance imaging system uses a first RF coil for acquiring a magnetic resonance signal from a subject, and a device for estimating a cardiac phase of the subject based on the magnetic resonance signal acquired by the first RF coil. The first RF coil, for example, can be an RF coil exclusive to cardiac phase estimation. The magnetic resonance imaging system also uses a second RF coil for acquiring a magnetic resonance signal based on the estimated cardiac phase, and a device for reconstructing a magnetic resonance image of the subject based on the magnetic resonance signal acquired by the second RF coil. Thus, MRA can be performed by estimating a cardiac phase.
    Type: Grant
    Filed: March 25, 2005
    Date of Patent: April 5, 2016
    Assignees: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATION
    Inventors: Hiroshi Takai, Yoshimori Kassai
  • Publication number: 20160018500
    Abstract: According to one embodiment, an MRI apparatus includes a data acquiring unit and processing circuitry. The data acquiring unit acquires MR signals for imaging according to data acquiring conditions for acquiring MR signals multiple times following one excitation. The data acquiring unit also acquires reference MR signals for phase correction of real space data for imaging. The real space data are generated based on the MR signals for imaging. The processing circuitry is configured to calculate a phase error, in a real space region, of reference real space data and generate MR image data based on the MR signals for imaging with the phase correction of the real space data for imaging based on the calculated phase error. The reference real space data are generated based on the reference MR signals. The real space region is determined based on conditions of acquiring the reference MR signals or the like.
    Type: Application
    Filed: September 25, 2015
    Publication date: January 21, 2016
    Inventors: Yoshinari MORITA, Hiroshi TAKAI, Yoshiteru WATANABE, Takashi SHIGETA
  • Patent number: 9073173
    Abstract: A polishing pad shape measured by a polishing pad shape measuring apparatus is modified into a target shape of a polishing pad by using a dressing tool so that a wafer has a desired surface shape. The invention is a method for shape modification of a polishing pad 14 for polishing a workpiece into a desired surface shape, comprising: a measurement step S9 of measuring a polishing pad shape in a state of being attached to a plate 12 by using a polishing pad shape measuring apparatus 10; a condition determination step S10 of selecting a dressing recipe capable of polishing the workpiece into a desired surface shape from a plurality of pre-provided dressing recipes based on the measurement result in the measurement step S9; and a shape modification step S11 of dressing the polishing pad 14 by using the dressing recipe determined in the condition determination step S10.
    Type: Grant
    Filed: December 29, 2010
    Date of Patent: July 7, 2015
    Assignee: SUMCO Corporation
    Inventors: Hiroshi Takai, Yuichi Nakayoshi
  • Publication number: 20140292335
    Abstract: A magnetic resonance imaging apparatus according to an embodiment includes: an obtaining unit, a correction coefficient deriving unit, an amplification degree deriving unit, and a filtering processing unit. The obtaining unit obtains a distribution of a radio frequency magnetic field. The correction coefficient deriving unit derives, on a basis of the distribution of the radio frequency magnetic field, a transmission correction coefficient used for correcting a transmission unevenness. The amplification degree deriving unit derives, for each of pixels, an amplification degree by which noise components are amplified in the image due to the correction, on the basis of either the distribution of the radio frequency magnetic field or the transmission correction coefficient. The filtering processing unit performs a filtering process according to the amplification degree on each of the pixels in the image to which the correction is applied.
    Type: Application
    Filed: June 12, 2014
    Publication date: October 2, 2014
    Inventors: Junichi KACHI, Hiroshi Takai, Yoshiteru Watanabe, Yoshinari Morita, Kazuya Tanoue
  • Publication number: 20140051978
    Abstract: A magnetic resonance imaging system uses a first RF coil for acquiring a magnetic resonance signal from a subject, and a device for estimating a cardiac phase of the subject based on the magnetic resonance signal acquired by the first RF coil. The first RF coil, for example, can be an RF coil exclusive to cardiac phase estimation. The magnetic resonance imaging system also uses a second RF coil for acquiring a magnetic resonance signal based on the estimated cardiac phase, and a device for reconstructing a magnetic resonance image of the subject based on the magnetic resonance signal acquired by the second RF coil. Thus, MRA can be performed by estimating a cardiac phase.
    Type: Application
    Filed: October 23, 2013
    Publication date: February 20, 2014
    Applicants: TOSHIBA MEDICAL SYSTEMS CORPORATION, KABUSHIKI KAISHA TOSHIBA
    Inventors: Hiroshi Takai, Yoshimori Kassai
  • Patent number: 8647174
    Abstract: Disclosed is a semiconductor wafer polishing method for polishing the surfaces to be polished of semiconductor wafers by use of polishing pads (16, 17) provided on fixing plates by relative movement of the polishing pads and the semiconductor wafers held by carriers. The shaping surfaces (25) of a polishing pad shaping jig (21) are shaped by inverting, with respect to ideal shapes, the shapes of the surfaces to be polished of each semiconductor wafer when the surfaces are polished by use of the polishing pads (16, 17) before shaping, and the shapes of the shaping surfaces of the polishing pad shaping jig are transferred to the pad surfaces (16A and 17A) of the respective polishing pads (16, 17). The surfaces to be polished of each semiconductor wafer are polished by use of the pad surfaces.
    Type: Grant
    Filed: April 26, 2010
    Date of Patent: February 11, 2014
    Assignee: Sumco Corporation
    Inventor: Hiroshi Takai
  • Patent number: 8643366
    Abstract: According to one embodiment, a MRI apparatus includes a data acquisition unit, a phase correction amount calculation unit and an image data generating unit. The data acquisition unit acquires MR signals in 3D k-space according to an imaging condition for HFI. The phase correction amount calculation unit calculates a first phase correction amount by applying processing including a phase correction based on k-space data for calculating the first phase correction amount and data compensation for a non-sampling region with the MR signals in the 3D k-space. The k-space data for calculating the first phase correction are MR signals less than the MR signals in the 3D k-space. The image data generating unit generates MR image data by applying processing including a phase correction using a second phase correction amount based on the first phase correction amount and the data compensation with the MR signals in the 3D k-space.
    Type: Grant
    Filed: September 15, 2011
    Date of Patent: February 4, 2014
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventor: Hiroshi Takai
  • Patent number: 8633694
    Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes; a data collection unit which collects magnetic resonance data from a patient by a half Fourier method using a plurality of coils; an unfolding unit which performs an unfolding process on a plurality of items of folded image data obtained from the plurality of coils to generate unfolded image data by using sensitivity data of the plurality of coils; and a data processing unit which repeatedly performs a data filling process and a phase correction process to improve accuracy of data in an unsampled region to generate image data for display, the data filling process filling the unsampled region in k-space with k-space data obtained by Fourier-transforming the unfolded image data and the unsampled region being a region for which the data have not been collected.
    Type: Grant
    Filed: October 22, 2010
    Date of Patent: January 21, 2014
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventor: Hiroshi Takai
  • Patent number: 8545712
    Abstract: In a method of manufacturing semiconductor wafers, front and back surfaces of the semiconductor wafers are simultaneously polished with a double-side polishing machine that includes: a carrier for accommodating the semiconductor wafer; and an upper press platen and a lower press platen for sandwiching the carrier. The method includes: accommodating the semiconductor wafer in the carrier while a thickness of the semiconductor wafer is set to be larger than a thickness of the carrier by 0 ?m to 5 ?m; and polishing the semiconductor wafer while feeding a polishing slurry to between the surfaces of the semiconductor wafer and surfaces of the press platens. In the polishing, an allowance of both surfaces of the semiconductor wafer is set at 5 ?m or less in total.
    Type: Grant
    Filed: September 11, 2008
    Date of Patent: October 1, 2013
    Assignee: Sumco Techxiv Corporation
    Inventors: Hiroshi Takai, Kenji Satomura, Yuichi Nakayoshi, Katsutoshi Yamamoto, Kouji Mizowaki
  • Patent number: 8396277
    Abstract: In an MRI apparatus, an executing unit executes an image taking sequence according to a parallel imaging method so as to collect MR signals by using a plurality of RF coils; a reconstructing unit reconstructs an MR image from the MR signals; an unfolding processing unit performs an unfolding process to unfold aliasing that has occurred in the MR image, by using sensitivity distribution data indicating a spatial sensitivity distribution of the RF coils; a judging unit judges whether the unfolded image includes one or more pixels of which the pixel values are abnormal; and when the judgment result is in the affirmative, a correcting unit corrects the sensitivity distribution data so that the pixel values of the pixels become closer to a normal value. After the sensitivity distribution data has been corrected, the unfolding processing unit performs the unfolding process again by using the corrected sensitivity distribution data.
    Type: Grant
    Filed: March 4, 2011
    Date of Patent: March 12, 2013
    Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems Corporation
    Inventor: Hiroshi Takai
  • Patent number: 8296961
    Abstract: A polishing pad thickness measuring method measures the thickness of a polishing pad attached to an upper surface of a surface plate. The polishing pad thickness measuring method measures a first distance between an upper surface of the polishing pad and a reference position on a vertical line perpendicular to the surface of the polishing pad and a second distance between an upper surface of the surface plate and the reference position on the vertical line, and calculates the thickness of the polishing pad from the difference between the first and second distances.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: October 30, 2012
    Assignee: Sumco Corporation
    Inventors: Yuichi Nakayoshi, Hiroshi Takai, Hironori Nishimura
  • Publication number: 20120081116
    Abstract: According to one embodiment, a MRI apparatus includes a data acquisition unit, a phase correction amount calculation unit and an image data generating unit. The data acquisition unit acquires MR signals in 3D k-space according to an imaging condition for HFI. The phase correction amount calculation unit calculates a first phase correction amount by applying processing including a phase correction based on k-space data for calculating the first phase correction amount and data compensation for a non-sampling region with the MR signals in the 3D k-space. The k-space data for calculating the first phase correction are MR signals less than the MR signals in the 3D k-space. The image data generating unit generates MR image data by applying processing including a phase correction using a second phase correction amount based on the first phase correction amount and the data compensation with the MR signals in the 3D k-space.
    Type: Application
    Filed: September 15, 2011
    Publication date: April 5, 2012
    Inventor: Hiroshi TAKAI
  • Publication number: 20120028547
    Abstract: Disclosed is a semiconductor wafer polishing method for polishing the surfaces to be polished of semiconductor wafers by use of polishing pads (16, 17) provided on fixing plates by relative movement of the polishing pads and the semiconductor wafers held by carriers. The shaping surfaces (25) of a polishing pad shaping jig (21) are shaped by inverting, with respect to ideal shapes, the shapes of the surfaces to be polished of each semiconductor wafer when the surfaces are polished by use of the polishing pads (16, 17) before shaping, and the shapes of the shaping surfaces of the polishing pad shaping jig are transferred to the pad surfaces (16A and 17A) of the respective polishing pads (16, 17). The surfaces to be polished of each semiconductor wafer are polished by use of the pad surfaces.
    Type: Application
    Filed: April 26, 2010
    Publication date: February 2, 2012
    Applicant: SUMCO CORPORATION
    Inventor: Hiroshi Takai
  • Publication number: 20110216955
    Abstract: In an MRI apparatus, an executing unit executes an image taking sequence according to a parallel imaging method so as to collect MR signals by using a plurality of RF coils; a reconstructing unit reconstructs an MR image from the MR signals; an unfolding processing unit performs an unfolding process to unfold aliasing that has occurred in the MR image, by using sensitivity distribution data indicating a spatial sensitivity distribution of the RF coils; a judging unit judges whether the unfolded image includes one or more pixels of which the pixel values are abnormal; and when the judgment result is in the affirmative, a correcting unit corrects the sensitivity distribution data so that the pixel values of the pixels become closer to a normal value. After the sensitivity distribution data has been corrected, the unfolding processing unit performs the unfolding process again by using the corrected sensitivity distribution data.
    Type: Application
    Filed: March 4, 2011
    Publication date: September 8, 2011
    Inventor: Hiroshi TAKAI
  • Patent number: RE43637
    Abstract: To optimize in advance a desired image quality determining pulse sequence parameter incorporated in an imaging scan, a preparation scan is adopted. The preparation scan is performed with the amount of at least one desired image quality parameter changed for each of plural preparatory images, so that a plurality of preparatory images at the desired same region of the object are acquired. For example, one such image quality parameter is TI (inversion time). The acquired preparatory scan data are processed into a plurality of preparatory images for display. A desired preparatory image is then selected from the plural preparatory images displayed, and the amount of the desired parameter used for that selected preparatory image is then set for use in the pulse sequence for a complete diagnostic imaging scan. Hence the desired image quality determining parameter of the pulse sequence is caused to have an optimum value before an actual complete diagnostic imaging scan.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: September 11, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mitsue Miyazaki, Hiroshi Takai
  • Patent number: RE43784
    Abstract: To optimize in advance a desired image quality determining pulse sequence parameter incorporated in an imaging scan, a preparation scan is adopted. The preparation scan is performed with the amount of at least one desired image quality parameter changed for each of plural preparatory images, so that a plurality of preparatory images at the desired same region of the object are acquired. For example, one such image quality parameter is TI (inversion time). The acquired preparatory scan data are processed into a plurality of preparatory images for display. A desired preparatory image is then selected from the plural preparatory images displayed, and the amount of the desired parameter used for that selected preparatory image is then set for use in the pulse sequence for a complete diagnostic imaging scan. Hence the desired image quality determining parameter of the pulse sequence is caused to have an optimum value before an actual complete diagnostic imaging scan.
    Type: Grant
    Filed: February 25, 2011
    Date of Patent: November 6, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Mitsue Miyazaki, Hiroshi Takai