Patents by Inventor Kazuto Nogami
Kazuto Nogami 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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Publication number: 20230277082Abstract: A permanent current switch apparatus according to an embodiment is a permanent current switch apparatus electrically connected to a superconducting coil via a superconducting wire, the permanent current switch apparatus including a plurality of parallel structures with thermal permanent current switches connected in parallel, the thermal permanent current switches being capable of switching between conducting and interrupting an electric current flowing through the superconducting wire. The parallel structures are connected in series.Type: ApplicationFiled: February 2, 2023Publication date: September 7, 2023Applicant: CANON MEDICAL SYSTEMS CORPORATIONInventors: Toshiki IDEMARU, Dai YAMASHIRO, Kazuto NOGAMI
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Patent number: 10578693Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a static field magnet, a gradient coil and a shim housing box. The static field magnet generates a static magnetic field in a space within a substantially cylindrical hollow. The gradient coil is provided inside the static field magnet and generates a gradient magnetic field. The shim housing box is capable of housing a metallic shim, the shim housing box being formed into a shape such that an attractive force of the static magnetic field applied to the shim housing box under magnetic excitation becomes smaller than a predetermined threshold.Type: GrantFiled: August 26, 2015Date of Patent: March 3, 2020Assignee: TOSHIBA MEDICAL SYSTEMS CORPORATIONInventors: Yoshitomo Sakakura, Kazuto Nogami, Hidekazu Tanaka
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Publication number: 20180067181Abstract: A magnetic field adjusting method according to an embodiment includes: acquiring, by using a measuring device, first data related to a static magnetic field while a static magnetic field magnet is generating the static magnetic field having magnetic field intensity lower than rated magnetic field intensity required by an imaging process performed by a magnetic resonance imaging apparatus; and calculating, by using processing circuitry, a positional arrangement of a shim member used for correcting uniformity of the static magnetic field on the basis of the first data.Type: ApplicationFiled: September 6, 2017Publication date: March 8, 2018Applicant: Toshiba Medical Systems CorporationInventors: Kazuto NOGAMI, Fumitoshi KOJIMA, Yoshitomo SAKAKURA, Hidekazu TANAKA, Takehiro SHIBUYA
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Patent number: 9835702Abstract: According to one embodiment, a magnetic field adjustment implement for a magnetic resonance imaging apparatus includes a magnetic field adjustment unit and a placing unit. The magnetic field adjustment unit is configured to improve a uniformity of a static magnetic field formed by a magnet of the magnetic resonance imaging apparatus. The static magnetic field is formed under an influence of a circumstance in a shield room in which the magnet is placed. The magnetic field adjustment is placed outside the magnet. The placing unit is configured to place the magnetic field adjustment unit outside the magnet.Type: GrantFiled: February 14, 2013Date of Patent: December 5, 2017Assignee: TOSHIBA MEDICAL SYSTEMS CORPORATIONInventors: Shohei Takami, Yoshitomo Sakakura, Kazuto Nogami, Hidekazu Tanaka
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Patent number: 9784808Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes an imaging unit and a shield. The imaging unit is configured to perform magnetic resonance imaging of an object by transmitting a radio frequency signal from a radio frequency coil while magnetic fields are formed by a gradient coil and a superconducting magnet respectively. The shield is configured to form a gradient magnetic field for the magnetic resonance imaging with the gradient coil and to prevent ingress of heat into the superconducting magnet.Type: GrantFiled: May 22, 2014Date of Patent: October 10, 2017Assignee: TOSHIBA MEDICAL SYSTEMS CORPORATIONInventors: Yoshitomo Sakakura, Kazuto Nogami, Hidekazu Tanaka
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Publication number: 20150362570Abstract: A magnetic resonance imaging apparatus according to an embodiment includes a static field magnet, a gradient coil and a shim housing box. The static field magnet generates a static magnetic field in a space within a substantially cylindrical hollow. The gradient coil is provided inside the static field magnet and generates a gradient magnetic field. The shim housing box is capable of housing a metallic shim, the shim housing box being formed into a shape such that an attractive force of the static magnetic field applied to the shim housing box under magnetic excitation becomes smaller than a predetermined threshold.Type: ApplicationFiled: August 26, 2015Publication date: December 17, 2015Inventors: Yoshitomo SAKAKURA, Kazuto NOGAMI, Hidekazu TANAKA
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Publication number: 20150346294Abstract: A magnetic resonance imaging device according to embodiments includes a substantially cylindrical-shaped coil structure. The coil structure includes a static field magnet generating a magnetostatic field in a space inside a cylinder, and a gradient coil disposed inside the cylinder of the static field magnet and generating a gradient magnetic field. In the coil structure, magnetic bodies are supported independently of the gradient coil, and are disposed near the center of the coil structure in the long axis direction in such a way as to extend along the circumferential direction of the substantially cylindrical shape.Type: ApplicationFiled: August 11, 2015Publication date: December 3, 2015Inventors: Kazuto NOGAMI, Yoshitomo SAKAKURA, Hidekazu TANAKA
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Publication number: 20140253125Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes an imaging unit and a shield. The imaging unit is configured to perform a magnetic resonance imaging of an object by transmitting a radio frequency signal from a radio frequency coil in a condition that magnetic fields are formed by a gradient coil and a superconducting magnet respectively. The shield is configured to form a gradient magnetic field for the magnetic resonance imaging with the gradient coil and to prevent an ingress of a heat into the superconducting magnet.Type: ApplicationFiled: May 22, 2014Publication date: September 11, 2014Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATIONInventors: Yoshitomo SAKAKURA, Kazuto NOGAMI, Hidekazu TANAKA
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Patent number: 8598879Abstract: A magnetic resonance diagnostic apparatus is configured in such a manner that: a high-frequency transmission coil transmits a high-frequency electromagnetic wave at a magnetic resonance frequency to an examined subject; a heating coil performs a heating process by radiating a high-frequency electromagnetic wave onto the examined subject at a frequency different from the magnetic resonance frequency; based on a magnetic resonance signal, a measuring unit measures the temperature of the examined subject changing due to the high-frequency electromagnetic wave radiated by the heating coil; and a control unit exercises control so that the measuring unit measures the temperature while the heating coil is performing the heating process, by ensuring that the transmission of the high-frequency electromagnetic wave by the high-frequency transmission coil and the radiation of the high-frequency electromagnetic wave by the heating coil are performed in parallel.Type: GrantFiled: May 16, 2011Date of Patent: December 3, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems CorporationInventors: Yoshitomo Sakakura, Satoshi Sugiura, Tomoyuki Yoshida, Takashi Yanashima, Masateru Iwasa, Yutaka Kato, Koji Kitamura, Kazuto Nogami, Hidekazu Tanaka, Makoto Sato, Shigehide Kuhara, Taketo Kawakami, Yasutake Yasuhara, Hiroshi Sugimoto
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Patent number: 8575934Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes a static magnetic-field generating unit, a gradient magnetic-field generating unit, a plurality of metal shim plates in a plate shape, and a shim holding unit. The metal shim plates adjust uniformity of the static magnetic field. The shim holding unit holds the metal shim plates in a layered state. Each of the metal shim plates includes a convex having a certain angle at a certain position, and the metal shim plates are layered such that the convex of each one metal shim plate comes into contact with a back of the bent convex of another metal shim plate.Type: GrantFiled: July 9, 2010Date of Patent: November 5, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems CorporationInventors: Masateru Iwasa, Yoshitomo Sakakura, Kazuto Nogami, Hidekazu Tanaka
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Patent number: 8564292Abstract: A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.Type: GrantFiled: October 4, 2012Date of Patent: October 22, 2013Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems CorporationInventors: Masateru Iwasa, Kazuto Nogami, Tomoyuki Yoshida, Fumitoshi Kojima, Yoshitomo Sakakura, Kohei Adachi
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Patent number: 8305079Abstract: A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.Type: GrantFiled: September 25, 2009Date of Patent: November 6, 2012Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems CorporationInventors: Masateru Iwasa, Kazuto Nogami, Tomoyuki Yoshida, Fumitoshi Kojima, Yoshitomo Sakakura, Kohei Adachi
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Publication number: 20110279116Abstract: A magnetic resonance diagnostic apparatus is configured in such a manner that: a high-frequency transmission coil transmits a high-frequency electromagnetic wave at a magnetic resonance frequency to an examined subject; a heating coil performs a heating process by radiating a high-frequency electromagnetic wave onto the examined subject at a frequency different from the magnetic resonance frequency; based on a magnetic resonance signal, a measuring unit measures the temperature of the examined subject changing due to the high-frequency electromagnetic wave radiated by the heating coil; and a control unit exercises control so that the measuring unit measures the temperature while the heating coil is performing the heating process, by ensuring that the transmission of the high-frequency electromagnetic wave by the high-frequency transmission coil and the radiation of the high-frequency electromagnetic wave by the heating coil are performed in parallel.Type: ApplicationFiled: May 16, 2011Publication date: November 17, 2011Inventors: Yoshitomo Sakakura, Satoshi Sugiura, Tomoyuki Yoshida, Takashi Yanashima, Masateru Iwasa, Yutaka Kato, Koji Kitamura, Kazuto Nogami, Hidekazu Tanaka, Makoto Sato, Shigehide Kuhara, Taketo Kawakami, Yasutake Yasuhara, Hiroshi Sugimoto
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Publication number: 20110006769Abstract: According to one embodiment, a magnetic resonance imaging apparatus includes a static magnetic-field generating unit, a gradient magnetic-field generating unit, a plurality of metal shim plates in a plate shape, and a shim holding unit. The metal shim plates adjust uniformity of the static magnetic field. The shim holding unit holds the metal shim plates in a layered state. Each of the metal shim plates includes a convex having a certain angle at a certain position, and the metal shim plates are layered such that the convex of each one metal shim plate comes into contact with a back of the bent convex of another metal shim plate.Type: ApplicationFiled: July 9, 2010Publication date: January 13, 2011Inventors: Masateru Iwasa, Yoshitomo Sakakura, Kazuto Nogami, Hidekazu Tanaka
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Publication number: 20100085053Abstract: A feedforward control unit predicts the maximum value of the temperature of a gradient coil based on a power duty and a scan time of a pulse sequence, and a present temperature of the gradient coil. When the maximum value exceeds a predetermined upper limit, the feedforward control unit then instructs a temperature adjusting unit to start a water circulation in a chiller at the start of a prescan, and the temperature adjusting unit starts the water circulation based on the instruction.Type: ApplicationFiled: September 25, 2009Publication date: April 8, 2010Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSYTEMS CORPORATIONInventors: Masateru IWASA, Kazuto NOGAMI, Tomoyuki YOSHIDA, Fumitoshi KOJIMA, Yoshitomo SAKAKURA, Kohei ADACHI
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Patent number: 7541812Abstract: A magnetic resonance imaging apparatus includes a static magnetic field generating unit, a main coil (gradient magnetic coil), a radio frequency coil, and a shimming structure unit. The shimming structure unit includes first iron shims and second iron shims. The first iron shims are disposed between the main coil and a shield coil of the gradient magnetic coil and disposed in a central axial center of the static magnetic field generating unit. The second iron shims are disposed on an outer side of the main coil and the shield coil and disposed on a central axial end of the static magnetic field generating unit.Type: GrantFiled: January 31, 2008Date of Patent: June 2, 2009Assignees: Kabushiki Kaisha Toshiba, Toshiba Medical Systems CorporationInventor: Kazuto Nogami
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Publication number: 20080191698Abstract: A magnetic resonance imaging apparatus includes a static magnetic field generating unit, a main coil (gradient magnetic coil), a radio frequency coil, and a shimming structure unit. The shimming structure unit includes first iron shims and second iron shims. The first iron shims are disposed between the main coil and a shield coil of the gradient magnetic coil and disposed in a central axial center of the static magnetic field generating unit. The second iron shims are disposed on an outer side of the main coil and the shield coil and disposed on a central axial end of the static magnetic field generating unit.Type: ApplicationFiled: January 31, 2008Publication date: August 14, 2008Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATIONInventor: Kazuto Nogami
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Publication number: 20060230769Abstract: A superconducting magnet device-monitoring system includes detecting unit, remaining amount estimating unit, and output unit. The detecting unit detects a remaining amount of liquid helium, in which a superconducting coil is immersed stored in a liquid helium container of a superconducting magnet device. The remaining amount estimating unit calculates an estimated remaining amount, which shows an estimated value of the remaining amount, on the basis of the remaining amount of liquid helium preliminarily detected by the detecting unit. The output unit outputs monitoring information on the superconducting magnet device on the basis of the detected remaining amount and estimated remaining amount of liquid helium.Type: ApplicationFiled: January 4, 2006Publication date: October 19, 2006Applicants: KABUSHIKI KAISHA TOSHIBA, TOSHIBA MEDICAL SYSTEMS CORPORATIONInventor: Kazuto Nogami