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).
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Patent number: 10151514Abstract: A compressor uses a refrigerant containing R1123 (1,1,2-trifluoroethylene) as a working fluid, and uses a polyol ester oil as a compressor lubricating oil. In addition, a fixed scroll and a revolving scroll each having a spiral lap rising from an end plate, and a compression chamber which is formed by meshing the fixed scroll and the revolving scroll, are provided. In addition, a discharge hole which is provided at a center position of the end plate of the fixed scroll, and is open to a discharge chamber, a bypass hole which is provided in the end plate of the fixed scroll, and communicates with the compression chamber and the discharge chamber at a timing different from a timing at which the compression chamber communicates with the discharge hole, and a check valve which is provided in the bypass hole, and allows a flow from the compression chamber side to the discharge chamber side.Type: GrantFiled: April 27, 2015Date of Patent: December 11, 2018Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Akira Fujitaka, Fuminori Sakima, Yoshikazu Kawabe, Atsushi Sakuda, Hiroaki Nakai, Shigehiro Sato, Kenji Takaichi
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Patent number: 10149655Abstract: According to one embodiment, a photon counting imaging apparatus includes an X-ray tube, an X-ray detector, and data acquisition circuitry. The X-ray detector includes a detector pixel including photoelectric conversion cells each configured to individually generate an electrical signal of a predetermined pulse height, and output circuitry configured to generate an energy signal having a pulse height corresponding to energy of the X-rays based on the electrical signals from the photoelectric conversion cells. The data acquisition circuitry corrects the energy signal based on a relationship between an amplification factor and an applied voltage to the detector pixel during a period until the voltage applied to the detector pixel recovers from a breakdown voltage to a reverse bias voltage.Type: GrantFiled: November 16, 2016Date of Patent: December 11, 2018Assignee: Toshiba Medical Systems CorporationInventors: Tooru Kato, Mikihito Hayashi, Hiroaki Nakai
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Publication number: 20180300909Abstract: 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: ApplicationFiled: April 12, 2018Publication date: October 18, 2018Applicant: Canon Medical Systems CorporationInventors: Emi TAMURA, Hiroaki NAKAI
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Patent number: 10102651Abstract: According to an embodiment, a device includes first and second generators, a detector, and a corrector. The first generator is configured to generate a first image based on data corresponding to photons with a first energy from among data that is obtained based on an energy of radiation that has passed through a subject. The second generator is configured to generate a second image based on data corresponding to photons with a second energy. The detector is configured to detect, in the second image, a second block having a similar pattern of pixel values to a first block included in the second image. The corrector is configured to correct pixel values of a third block in the first image corresponding to the first block based on new pixel values of the third block that are calculated by using pixel values included in a fourth block in the first image.Type: GrantFiled: March 26, 2018Date of Patent: October 16, 2018Assignee: Toshiba Medical Systems CorporationInventors: Takashi Ida, Toshiyuki Ono, Shuhei Nitta, Taichiro Shiodera, Hidenori Takeshima, Tomoyuki Takeguchi, Hiroaki Nakai
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Publication number: 20180291899Abstract: 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: ApplicationFiled: June 8, 2018Publication date: October 11, 2018Inventors: Hiroaki NAKAI, Hirofumi YOSHIDA, Shingo OYAGI, Yu SHIOTANI, Tsuyoshi KARINO
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Patent number: 10077922Abstract: A compressor uses a refrigerant containing R1123 (1,1,2-trifluoroethylene) as a working fluid, and uses a polyvinyl ether oil as a compressor lubricating oil. In addition, a fixed scroll (12) and a revolving scroll (13) each having a spiral lap rising from an end plate, and a compression chamber (15) which is formed by meshing the fixed scroll (12) and the revolving scroll (13), are provided. In addition, a discharge hole (18) which is provided at a center position of the end plate of the fixed scroll (12), and is open to a discharge chamber (31), a bypass hole (68) which is provided in the end plate of the fixed scroll (12), and communicates with the compression chamber (15) and the discharge chamber (31) at a timing different from a timing at which the compression chamber (15) communicates with the discharge hole (18), and a check valve which is provided in the bypass hole (68), and allows a flow from the compression chamber (15) side to the discharge chamber (31) side.Type: GrantFiled: April 27, 2015Date of Patent: September 18, 2018Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Akira Fujitaka, Fuminori Sakima, Yoshikazu Kawabe, Atsushi Sakuda, Hiroaki Nakai, Shigehiro Sato, Kenji Takaichi
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Patent number: 10074197Abstract: An X-ray computed-tomography (CT) apparatus of an embodiment includes an X-ray tube, an X-ray detector, and processing circuitry. The X-ray tube is configured to generate an X-ray. The X-ray detector includes a plurality of X-ray detection elements configured to output a signal based on the X-ray entered therein. The processing circuitry is configured to derive a constraint condition by using at least one piece of projection data out of a plurality of pieces of projection data corresponding energy bins of which differ at least partially, calculate an effective length that is a total length for which the X-ray has passed through a region in which a material to be decomposed is present, and generate image data showing information about the material by using the projection data and the effective length.Type: GrantFiled: September 1, 2015Date of Patent: September 11, 2018Assignee: Toshiba Medical Systems CorporationInventors: Shuhei Nitta, Taichiro Shiodera, Tomoyuki Takeguchi, Hidenori Takeshima, Toshiyuki Ono, Takashi Ida, Hiroaki Nakai
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Publication number: 20180242927Abstract: According to one embodiment, an X-ray computed tomography apparatus includes an X-ray tube and an X-ray detector. The X-ray tube generates X-rays. The X-ray detector includes a first detection area detecting the X-rays and a second detection area detecting the X-rays. The first detection area includes a first scintillator having a first fluorescence decay time, the second detection area includes a second scintillator having a second fluorescence decay time shorter than the first fluorescence decay time. The second detection area is arranged at both ends of the first detection area with respect to a channel direction.Type: ApplicationFiled: February 22, 2018Publication date: August 30, 2018Applicant: Canon Medical Systems CorporationInventors: Hiroaki Nakai, Emi Tamura, Hiroaki Miyazaki, Mikihito Hayashi, Tooru Kato, Naoki Sugihara
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Patent number: 10043293Abstract: An image processing device to reduce noise in a medical image includes first and second generators, a detector, and a corrector. A first image is generated based on data corresponding to photons with a first energy from among data that is obtained based on an energy of radiation that has passed through a subject and a second image is generated based on data corresponding to photons with a second energy. The detector finds, in the second image, a second block having a similar pattern of pixel values to a first block included in the second image. The corrector reduces noise by correcting pixel values of a third block in the first image corresponding to the first block based on new pixel values of the third block that are calculated by using pixel values included in a fourth block in the first image.Type: GrantFiled: June 2, 2015Date of Patent: August 7, 2018Assignee: Toshiba Medical Systems CorporationInventors: Takashi Ida, Toshiyuki Ono, Shuhei Nitta, Taichiro Shiodera, Hidenori Takeshima, Tomoyuki Takeguchi, Hiroaki Nakai
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Publication number: 20180211418Abstract: According to an embodiment, a device includes first and second generators, a detector, and a corrector. The first generator is configured to generate a first image based on data corresponding to photons with a first energy from among data that is obtained based on an energy of radiation that has passed through a subject. The second generator is configured to generate a second image based on data corresponding to photons with a second energy. The detector is configured to detect, in the second image, a second block having a similar pattern of pixel values to a first block included in the second image. The corrector is configured to correct pixel values of a third block in the first image corresponding to the first block based on new pixel values of the third block that are calculated by using pixel values included in a fourth block in the first image.Type: ApplicationFiled: March 26, 2018Publication date: July 26, 2018Applicant: Toshiba Medical Systems CorporationInventors: Takashi IDA, Toshiyuki Ono, Shuhei Nitta, Taichiro Shiodera, Hidenori Takeshima, Tomoyuki Takeguchi, Hiroaki Nakai
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Publication number: 20180211417Abstract: 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: ApplicationFiled: January 23, 2018Publication date: July 26, 2018Applicant: Canon Medical Systems CorporationInventors: Hiroaki MIYAZAKI, Hiroaki NAKAI, Naoki SUGIHARA, Tooru KATO, Mikihito HAYASHI, Emi TAMURA
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Publication number: 20180156217Abstract: 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: ApplicationFiled: June 7, 2016Publication date: June 7, 2018Inventors: FUMINORI SAKIMA, AKIRA FUJITAKA, HIROAKI NAKAI, AKIHIRO KYOGOKU, HIDEAKI MATSUO, SHIGEHIRO SATO, KENJI TAKAICHI
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Publication number: 20180098746Abstract: 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: ApplicationFiled: October 3, 2017Publication date: April 12, 2018Applicant: Toshiba Medical Systems CorporationInventors: Tooru KATO, Hiroaki NAKAI
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Patent number: 9924916Abstract: An X-ray CT apparatus includes: intensity distribution data acquiring circuitry is configured to acquire, by performing a first scan, intensity distribution data of X-rays being radiated from an X-ray tube and having passed through a subject; scan controlling circuitry is configured to estimate an X-ray dose with which it is possible to discriminate individual X-ray photons having passed through the subject based on the intensity distribution data and to cause a second scan that is for a photon counting CT purpose to be performed by causing the estimated dose of X-rays to be radiated from the X-ray tube to the subject; a counting result acquiring circuitry is configured to acquire, by the second scan, a counting result by counting the X-ray photons being radiated from the X-ray tube and having passed through the subject; and an image reconstructing circuitry is configured to reconstruct X-ray CT image data based on the counting result.Type: GrantFiled: June 19, 2015Date of Patent: March 27, 2018Assignee: Toshiba Medical Systems CorporationInventors: Tooru Kato, Hiroaki Nakai, Kanta Kobuchi
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Patent number: 9913622Abstract: According to an embodiment, an X-ray computed tomography (CT) apparatus includes processing circuitry. The processing circuitry is configured to acquire projection data that is based on a spectrum representing an amount of X-rays with respect to energy of a radiation having passed through a subject; select a plurality of materials; generate, from the projection data, first density images for each of the selected materials; generate a monochromatic image of specific energy from the first density images; reconstruct the projection data corresponding to the specific energy to generate a reconstructed image; compare the monochromatic image and the reconstructed image; and provide a notification indicating a result of the comparison.Type: GrantFiled: February 17, 2016Date of Patent: March 13, 2018Assignee: Toshiba Medical Systems CorporationInventors: Takashi Ida, Toshiyuki Ono, Shuhei Nitta, Hiroaki Nakai
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Patent number: 9872661Abstract: According to an embodiment, an X-ray computed tomography apparatus includes processing circuitry. The processing circuitry is configured to acquire first projection data that is based on a first spectrum representing an amount of radioactive rays in a unit of energy of the radioactive rays having passed through a subject and detected by a detector. The processing circuitry is configured to generate second projection data by correcting the first projection data based on a response characteristic of the detector. The processing circuitry is configured to operate reconstruction process to the second projection data.Type: GrantFiled: November 18, 2015Date of Patent: January 23, 2018Assignee: Toshiba Medical Systems CorporationInventors: Toshiyuki Ono, Takashi Ida, Shuhei Nitta, Hiroaki Nakai
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Patent number: 9872654Abstract: A medical image processing apparatus according to an embodiment includes compressing circuitry. The compressing circuitry is configured to compress, for each of a first data group and a second data group both of which being included in data pertaining to a medical image, each of the first data group and the second data group separately, starting from data corresponding to a boundary between the first data group and the second data group and shifting sequentially to a direction away from the boundary.Type: GrantFiled: June 30, 2015Date of Patent: January 23, 2018Assignee: Toshiba Medical Systems CorporationInventors: Nakaba Kogure, Tomoya Kodama, Shinichiro Koto, Wataru Asano, Hiroaki Nakai
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Patent number: 9844350Abstract: A medical image processing apparatus according to an embodiment includes compressing circuitry. The compressing circuitry is configured to compress, for each of a first data group and a second data group both of which being included in data pertaining to a medical image, each of the first data group and the second data group separately, starting from data corresponding to a boundary between the first data group and the second data group and shifting sequentially to a direction away from the boundary.Type: GrantFiled: June 30, 2015Date of Patent: December 19, 2017Assignee: Toshiba Medical Systems CorporationInventors: Nakaba Kogure, Tomoya Kodama, Shinichiro Koto, Wataru Asano, Hiroaki Nakai
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Patent number: 9841389Abstract: A photon-counting type X-ray computed tomography apparatus that comprises a high-voltage generator to generate a voltage signal, an X-ray tube to emit X-rays when the X-ray tube receives the voltage signal from the high-voltage generator, an X-ray detector to detect photons derived from the X-rays emitted from the X-ray tube, and circuitry to count a number of the detected photons with respect to a plurality of energy bands, detect a number of photons in a first energy band that exceeds an energy level corresponding to a voltage value of the voltage signal, and changing a number of photons at a second energy band based on the detected number of photons in the first energy band, to correct for operational limitations of the X-ray detector.Type: GrantFiled: January 14, 2015Date of Patent: December 12, 2017Assignee: Toshiba Medical Systems CorporationInventors: Emi Tamura, Yasuo Saito, Takuzo Takayama, Hiroaki Miyazaki, Hiroaki Nakai
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Publication number: 20170350623Abstract: A refrigeration cycle device according to the present invention includes a compressor having a first compression chamber and a second compression chamber, a condenser, a decompressor, an evaporator, an injection path configured to introduce intermediate pressure refrigerant, a communication passage configured to introduce intermediate pressure refrigerant compressed in the first compression chamber to the second compression chamber, and a switch element configured to selectively make the second compression chamber communicate with the evaporator or make the second compression chamber communicate with the communication passage. The injection path introduces the intermediate pressure refrigerant to the second compression chamber. Single-stage compressing operation is performed when the second compression chamber is communicated with the evaporator, and two-stage compressing operation is performed when the second compression chamber is communicated with the communication passage.Type: ApplicationFiled: November 12, 2015Publication date: December 7, 2017Inventors: HIROAKI NAKAI, ATSUSHI SAKUDA