Patents by Inventor Hiroaki Nakai

Hiroaki Nakai 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: 20210052236
    Abstract: In general, an X-ray imaging apparatus according to one embodiment includes an X-ray tube, an X-ray detector, and processing circuitry. The processing circuitry is configured to obtain correction-target data that includes component deterioration resulting from a transient response of the X-ray detector, and to output, based on the obtained correction-target and a model that outputs data in which component deterioration resulting from a transient response is reduced based on an input of data that includes component deterioration resulting from a transient response, corrected data in which the component deterioration resulting from the transient response of the X-ray detector is reduced.
    Type: Application
    Filed: August 7, 2020
    Publication date: February 25, 2021
    Applicant: Canon Medical Systems Corporation
    Inventor: Hiroaki NAKAI
  • Publication number: 20200367836
    Abstract: A radiation detector according to an embodiment includes a sensor, an electronic circuitry, a switch, and a control circuitry. The sensor configured to be formed of plural electrodes and detect radiation. Based on signals output from the electrodes, the electronic circuitry configured to output digital data. The switch configured to be provided between each of the electrodes and the electronic circuitry. The control circuitry configured to control the switch, based on a positional relation between the plural electrodes and an anti-scatter grid.
    Type: Application
    Filed: May 20, 2020
    Publication date: November 26, 2020
    Applicant: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Go KAWATA, Hiroaki NAKAI
  • Patent number: 10769822
    Abstract: An X-ray CT apparatus according to an embodiment includes a photon counting detector, and processing circuitry. The photon counting detector includes a plurality of detecting elements each of which outputs signals corresponding to numbers of photons that are counted. The processing circuitry generates pieces of first projection data on a basis of the signals from the plurality of detecting elements. The processing circuitry generate second projection data by bundling together, in spatial units, pieces of first projection data from a predetermined number of detecting elements among the plurality of detecting elements. The processing circuitry reconstructs a material decomposition image on a basis of the second projection data.
    Type: Grant
    Filed: April 12, 2018
    Date of Patent: September 8, 2020
    Assignee: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Emi Tamura, Hiroaki Nakai
  • Patent number: 10743834
    Abstract: An X-ray image diagnostic apparatus according to an embodiment includes a photon counting X-ray detector, calibration circuitry, and image generating circuitry. The photon counting X-ray detector includes a plurality of detection elements each of which is configured to detect X-rays and output a detection signal. The calibration circuitry calibrates a detection signal of each of the detection elements using a correction value calculated from a plurality of signals output from the detection elements and corresponding to a plurality of X-ray application conditions relating to continuous X-rays. The image generating circuitry generates an image using the calibrated detection signals of the detection elements.
    Type: Grant
    Filed: October 3, 2017
    Date of Patent: August 18, 2020
    Assignee: Canon Medical Systems Corporation
    Inventors: Tooru Kato, Hiroaki Nakai
  • Patent number: 10667774
    Abstract: An X-ray CT apparatus according to an embodiment includes a photon counting detector and processing circuitry. The photon counting detector includes a plurality of detection areas arranged in a channel direction and a column direction and is configured to output detection signals corresponding to the quantity of photons incident thereto, the detection areas each including a plurality of detecting elements. The processing circuitry is configured to calculate a heat generation amount for each of the detection areas on the basis of the detection signal corresponding to the incident photons detected in the detection area, to determine a control amount on the basis of the heat generation amount calculated for each of the detection areas, and to control temperature in each of the detection areas by using the determined control amount.
    Type: Grant
    Filed: July 20, 2018
    Date of Patent: June 2, 2020
    Assignee: Canon Medical Systems Corporation
    Inventors: Tooru Kato, Hiroaki Miyazaki, Emi Tamura, Hiroaki Nakai
  • Patent number: 10646186
    Abstract: An X-ray computed tomography (CT) apparatus according to an embodiment includes an X-ray generator, an X-ray detector and processing circuitry. The X-ray generator irradiates X-rays to a subject. The X-ray detector detects the X-rays that have passed through the subject. The processing circuitry calculates an estimated spectrum based on an irradiation spectrum, an estimated length and information indicating a distortion of a spectrum occurring in a path of the X-rays passing through the subject, the estimated length representing an estimated value of an X-ray transmission length of a material of decomposition target. The processing circuitry determines an X-ray transmission length of the material of decomposition target based on the estimated spectrum and a detected spectrum that is a spectrum after the X-rays have passed through the subject and that is detected by the X-ray detector.
    Type: Grant
    Filed: January 18, 2017
    Date of Patent: May 12, 2020
    Assignee: CANON MEDICAL SYSTEMS CORPORATION
    Inventors: Shuhei Nitta, Toshiyuki Ono, Takashi Ida, Hiroaki Nakai
  • Patent number: 10591188
    Abstract: A refrigeration cycle device includes a refrigeration cycle formed by connecting a compressor, a condenser, an expansion valve and an evaporator to each other. As a refrigerant in the refrigeration cycle, a working fluid containing 1,1,2-trifluoroethylene (R1123) and difluoromethane (R32) is used. A degree of opening of the expansion valve is controlled such that the refrigerant has two phases at a suction portion of the compressor.
    Type: Grant
    Filed: May 8, 2015
    Date of Patent: March 17, 2020
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Fuminori Sakima, Akira Fujitaka, Shigehiro Sato, Kenji Takaichi, Yoshikazu Kawabe, Hiroaki Nakai
  • Patent number: 10590934
    Abstract: The present invention includes a refrigeration cycle circuit that includes compressor, indoor heat exchanger, expansion valve, and outdoor heat exchanger that are connected to each other. A working fluid containing R1123 (1,1,2-trifluoroethylene) and R32 (difluoromethane) is used as a refrigerant sealed in the refrigeration cycle circuit, and an electric motor driving device that drives an electric motor of compressor includes a rotational speed estimator. The rotational speed estimator estimates rotational speed based on information on a detection value of an electric current input to the electric motor or a magnetic pole position of a rotor that constitutes the electric motor.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: March 17, 2020
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Fuminori Sakima, Akira Fujitaka, Hiroaki Nakai, Akihiro Kyogoku, Hideaki Matsuo, Shigehiro Sato, Kenji Takaichi
  • Publication number: 20200063737
    Abstract: In an asymmetrical scroll compressor, at least one injection port through which an intermediate-pressure refrigerant is injected into a first compression chamber and a second compression chamber, at least one injection port penetrating an end plate of a fixed scroll at a position where the injection port is open to the first compression chamber or the second compression chamber during a compression stroke after a suction refrigerant is introduced and closed. Further, the amount of a refrigerant injected from an injection port into the first compression chamber is made more than the amount of a refrigerant injected from the injection port into the second compression chamber.
    Type: Application
    Filed: October 12, 2017
    Publication date: February 27, 2020
    Inventors: Hiroaki NAKAI, Atsushi SAKUDA
  • Publication number: 20200064498
    Abstract: According to one embodiment, a sensitivity correction method includes acquiring count rates for respective pixels in a photon counting detector; preparing incident dose adjustment materials for the respective pixels based on the count rates for the respective pixels; and providing the incident dose adjustment materials in a surface of the photon counting detector.
    Type: Application
    Filed: August 14, 2019
    Publication date: February 27, 2020
    Applicant: Canon Medical Systems Corporation
    Inventors: Hiroaki NAKAI, Hiroaki MIYAZAKI, Tooru KATO, Mikihito HAYASHI, Naoki SUGIHARA
  • Publication number: 20200063736
    Abstract: A compression chamber includes the compression chamber partitioning member, an intermediate pressure chamber guides an intermediate pressure working fluid before injection to the compression chamber, and the intermediate pressure chamber and the compression chamber face each other with a compression chamber partitioning member interposed between the intermediate pressure chamber and the compression chamber. Further, the intermediate pressure chamber includes an intermediate pressure chamber inlet through which an intermediate pressure working fluid flows, an injection port inlet of an injection port through which the intermediate pressure working fluid is injected into the compression chamber, and a liquid reservoir formed at a position below the intermediate pressure chamber inlet, and the liquid reservoir is formed by the compression chamber partitioning member.
    Type: Application
    Filed: October 12, 2017
    Publication date: February 27, 2020
    Inventors: Hiroaki NAKAI, Atsushi SAKUDA, Takashi MORIMOTO
  • Publication number: 20200033273
    Abstract: A photon counting X-ray CT apparatus according to an embodiment includes: data acquiring circuitry, and processing circuitry. The data acquiring circuitry is configured to allocate energy measured by signals output from a photon counting detector in response to incidence of X-ray photons to any of a plurality of first energy bins so as to acquire a first data group as count data of each of the first energy bins. The processing circuitry is configured to determine a plurality of second energy bins obtained by grouping the first energy bins in accordance with a decomposition target material that is a material to be decomposed in a imaging region, allocate the first data group to any of the second energy bins so as to generate a second data group, and use the second data group to generate an image representing a distribution of the decomposition target material.
    Type: Application
    Filed: October 1, 2019
    Publication date: January 30, 2020
    Applicant: Canon Medical Systems Corporation
    Inventors: Kenta Moriyasu, Taichiro Shiodera, Shuhei Nitta, Tomoyuki Takeguchi, Hidenori Takeshima, Toshiyuki Ono, Takashi Ida, Hiroaki Nakai
  • Patent number: 10497152
    Abstract: An X-ray CT apparatus according to an embodiment includes an X-ray tube, a photon counting detector, and a processing circuitry. The X-ray tube is configured to generate X-rays. The photon counting detector includes a plurality of detecting elements each configured to output a signal in response to any of the X-rays becoming incident thereto after having passed through an examined subject. The processing circuitry is configured to determine, within a reconstruction region, a first region on which a spectrum reconstructing process is to be performed and a second region on which an energy integral reconstructing process is to be performed, on the basis of output values related to energy spectra based on the signals output by the detecting elements. The processing circuitry is configured to generate an image on the basis of the determined first region and the determined second region.
    Type: Grant
    Filed: January 23, 2018
    Date of Patent: December 3, 2019
    Assignee: Canon Medical Systems Corporation
    Inventors: Hiroaki Miyazaki, Hiroaki Nakai, Naoki Sugihara, Tooru Kato, Mikihito Hayashi, Emi Tamura
  • Patent number: 10451568
    Abstract: A photon counting X-ray CT apparatus according to an embodiment includes: data acquiring circuitry, and processing circuitry. The data acquiring circuitry is configured to allocate energy measured by signals output from a photon counting detector in response to incidence of X-ray photons to any of a plurality of first energy bins so as to acquire a first data group as count data of each of the first energy bins. The processing circuitry is configured to determine a plurality of second energy bins obtained by grouping the first energy bins in accordance with a decomposition target material that is a material to be decomposed in a imaging region, allocate the first data group to any of the second energy bins so as to generate a second data group, and use the second data group to generate an image representing a distribution of the decomposition target material.
    Type: Grant
    Filed: August 21, 2015
    Date of Patent: October 22, 2019
    Assignee: Canon Medical Systems Corporation
    Inventors: Kenta Moriyasu, Taichiro Shiodera, Shuhei Nitta, Tomoyuki Takeguchi, Hidenori Takeshima, Toshiyuki Ono, Takashi Ida, Hiroaki Nakai
  • Publication number: 20190309750
    Abstract: In a scroll compressor according to the present invention, at least one injection port penetrating a second end plate of a fixed scroll at a position where the injection port is open to a first compression chamber or a second compression chamber in a compression stroke after the suction refrigerant is introduced and closed. Further, the discharge bypass port is disposed such that a volume ratio, which is a ratio of a suction volume to a discharge volume of the second compression chamber at which the refrigerant in the first compression chamber can be discharged, is smaller in the first compression chamber, which is one compression chamber having the large amount of the refrigerant injected from the injection port, than in the second compression chamber, which is the other compression chamber among the first compression chamber and the second compression chamber.
    Type: Application
    Filed: October 12, 2017
    Publication date: October 10, 2019
    Inventors: Hiroaki NAKAI, Atsushi SAKUDA
  • Patent number: 10338012
    Abstract: A photon counting detector of an embodiment includes X-ray detection elements, a capacitor, and generating circuitry. The X-ray detection elements detect an X-ray and generate an electrical signal. The capacitor is provided for each of the X-ray detection element, and accumulates an electrical signal generated in each of the X-ray detection element. The generating circuitry has low sensitivity to radiation, and generates a digital signal by using an accumulation result of the electrical signal in the capacitors, and reference information that is stored in advance.
    Type: Grant
    Filed: March 1, 2017
    Date of Patent: July 2, 2019
    Assignee: Toshiba Medical Systems Corporation
    Inventors: Tooru Kato, Hiroaki Nakai, Mikihito Hayashi
  • Patent number: 10251626
    Abstract: According to one embodiment, a medical image processing apparatus includes a storage and processing circuitry. The storage stores a first image indicating a breast of an object captured by a medical image diagnostic apparatus and interpretation information associated with the first image. The processing circuitry generates, based on position information of a region of interest based on the interpretation information and information of an interpretation direction, schematic diagram information for adding information about a position of the region of interest onto a schematic diagram of the breast. The processing circuitry transmits information, including the schematic diagram information, for generating the schematic diagram.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: April 9, 2019
    Assignee: Toshiba Medical Systems Corporation
    Inventors: Kazuki Utsunomiya, Yusuke Kano, Shinya Sugiyama, Kei Mori, Tooru Kato, Hiroaki Nakai
  • Patent number: 10233930
    Abstract: A rotary compressor having two cylinders includes crankshaft having first eccentric portion and second eccentric portion connected to each other by connecting portion. The rotary compressor further includes two compressive elements that compress working fluid in cylinder as first piston inserted over first eccentric portion eccentrically rotates in accordance with rotation of crankshaft. Further, first piston inserted over first eccentric portion undergoes assembly by being inserted over first eccentric portion through second eccentric portion. Further, a releasing portion is provided at each of outer diameter portions of first eccentric portion and second eccentric portion.
    Type: Grant
    Filed: June 8, 2018
    Date of Patent: March 19, 2019
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Hiroaki Nakai, Hirofumi Yoshida, Shingo Oyagi, Yu Shiotani, Tsuyoshi Karino
  • Patent number: 10233929
    Abstract: A rotary compressor having two cylinders includes crankshaft having first eccentric portion and second eccentric portion connected to each other by connecting portion. The rotary compressor further includes two compressive elements that compress working fluid in cylinder as first piston inserted over first eccentric portion eccentrically rotates in accordance with rotation of crankshaft. Further, first piston inserted over first eccentric portion undergoes assembly by being inserted over first eccentric portion through second eccentric portion. Further, a releasing portion is provided at each of outer diameter portions of first eccentric portion and second eccentric portion.
    Type: Grant
    Filed: June 8, 2015
    Date of Patent: March 19, 2019
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Hiroaki Nakai, Hirofumi Yoshida, Shingo Oyagi, Yu Shiotani, Tsuyoshi Karino
  • Patent number: 10219775
    Abstract: A photon-counting X-ray computed tomography (CT) apparatus according to an embodiment includes an X-ray tube, a detector, a photon counting circuitry, a correcting circuitry, and a calculating circuitry. The X-ray tube irradiates a subject with X-rays. The detector includes a plurality of detection elements that detect photons of X-rays incident on the detection elements. The photon counting circuitry counts the count of X-ray photons for each energy bin set in an X-ray energy distribution, for each position of the X-ray tube, and for each of the detection elements. The correcting circuitry corrects the count of the X-ray photons counted by the photon counting circuitry, based on a detection characteristic, of the detection elements. The calculating circuitry calculates the reliability of a pixel in a reconstruction image, based on the correction.
    Type: Grant
    Filed: October 27, 2016
    Date of Patent: March 5, 2019
    Assignee: Toshiba Medical Systems Corporation
    Inventors: Hiroaki Nakai, Mikihito Hayashi, Tooru Kato