Patents by Inventor Hiroyuki Takeuchi
Hiroyuki Takeuchi 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: 8870676Abstract: A golf club 2 includes a shaft 6, a grip 8 mounted to an end part of the shaft 6, a cavity body 10 mounted to the end part of the shaft 6 to which the grip 8 is mounted, and a weight body 12 detachably mounted to the cavity body 10. The cavity body 10 includes a polymer. Preferably, an outer peripheral surface 16a of the cavity body 10 is mounted to an inner peripheral surface 6a of the shaft so as to abut on the inner peripheral surface 6a. Two or more projections are formed on one of the outer peripheral surface 16a of the cavity body 10 and the inner peripheral surface 6a of the shaft. Two or more recessed parts are formed on the other. The two or more projections are engaged with the two or more recessed parts.Type: GrantFiled: December 6, 2011Date of Patent: October 28, 2014Assignee: SRI Sports LimitedInventor: Hiroyuki Takeuchi
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Publication number: 20140292334Abstract: With minimizing extension of imaging time, the B1 non-uniformity reducing effect of RF shimming is maximized for an imaging section of an arbitrary axis direction and an arbitrary position. B1 distributions are measured for only several sections of one predetermined direction, and a radio frequency magnetic field condition that maximizes the B1 non-uniformity reducing effect for an imaging section of an arbitrary direction and an arbitrary position is calculated from the B1 distribution data.Type: ApplicationFiled: July 27, 2012Publication date: October 2, 2014Applicant: Hitachi Medical CorporationInventors: Yukio Kaneko, Yoshihisa Soutome, Yoshitaka Bito, Hiroyuki Takeuchi, Tetsuhiko Takahashi, Hideta Habara, Yosuke Otake
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Publication number: 20140253126Abstract: In order to provide a technique which can suppress coupling to homogenize the spatial distribution of an RF magnetic field and can improve penetration of the RF magnetic field into the subject, pad-like electric field conductors having a predetermined area are provided outside both ends of a rung conductor as a part of a configuration which forms a loop-like circuit and is driven as an antenna. An antenna device includes a sheet-like conductor, a rung conductor which is arranged at a predetermined distance from the sheet-like conductor, two electric field conductors which are arranged in both end portions of the rung conductor at a predetermined distance from the sheet-like conductor, and connection terminals which are transmission and reception terminals provided in the rung conductor and the sheet-like conductor. The rung conductor and the sheet-like conductor configure a loop circuit which resonates at a preset frequency.Type: ApplicationFiled: October 17, 2012Publication date: September 11, 2014Applicant: HITACHI MEDICAL CORPORATIONInventors: Hideta Habara, Yoshihisa Soutome, Hiroyuki Takeuchi, Hisaaki Ochi
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Publication number: 20140210476Abstract: A device includes: a static magnetic field generating device including static magnetic field generating sources generating a homogeneous magnetic field in a space; gradient magnetic field generating sources superimposing a gradient magnetic field on the homogeneous magnetic field, and conductor rings arranged between the static magnetic field generating sources and the gradient magnetic field generating sources in a pair of arranging regions on both sides in a direction of the homogeneous magnetic field in a region where the homogeneous magnetic field is generated (imaging region), respectively, the conductor rings being separated from each other and making a pair. The conductor rings are mechanically connected to the gradient magnetic field generating device or the static magnetic field generating device. This provides an MRI device 1 capable of reduction in vibration with suppression of the image quality deterioration of the tomographic images.Type: ApplicationFiled: August 10, 2012Publication date: July 31, 2014Applicant: HITACHI MEDICAL CORPORATIONInventors: Takeshi Kawamura, Yukinobu Imamura, Mitsushi Abe, Takuro Honda, Hiroyuki Takeuchi
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Patent number: 8648597Abstract: An RF coil is provided with a hollow-shaped outer conductive element and strip-shaped conductive elements disposed along the outer conductive element in the axial direction. The strip-shaped conductive elements are disposed with uneven intervals to secure an internal space at a position where the strip-shaped conductive elements are not disposed. In order to obtain uniform sensitivity at the center section of the RF coil, the strip-shaped conductive elements and the outer conductive element are electrically connected via capacitors of which capacitances are adjusted so that a magnetic field component perpendicular to the center axis should be generated at a desired resonance frequency, and the strip-shaped conductive elements are axisymmetrically disposed with respect to the center axis of the outer conductive element. As a result, a comfortable examination space in a tunnel type MRI apparatus is achieved without increasing the manufacturing cost of the MRI apparatus.Type: GrantFiled: February 9, 2010Date of Patent: February 11, 2014Assignee: Hitachi Medical CorporationInventors: Hideta Habara, Yoshitaka Bito, Hisaaki Ochi, Yoshihisa Soutome, Masayoshi Dohata, Tetsuhiko Takahashi, Hiroyuki Takeuchi
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Publication number: 20130335088Abstract: A gradient coil device includes a major axis gradient coil, having an ellipse in a cross section generating a gradient magnetic field inclined in a major axis direction of the ellipse at a magnetic field space; and a minor axis gradient coil, having an ellipse in a cross section generating a gradient magnetic field inclined in a minor axis direction of the ellipse at the magnetic field space. A length of the minor axis field coil in the center axis direction is shorter than a length of the major axis gradient coil in the center axis direction. A maximum value of a residual magnetic field generated by the minor axis gradient coil at a space outside the magnetic field space is equal to or smaller than a maximum value of a residual magnetic field generated by the major axis gradient coil at a space outside the magnetic field space.Type: ApplicationFiled: January 13, 2012Publication date: December 19, 2013Applicant: HITACHI MEDICAL CORPORATIONInventors: Masanao Terada, Mitsushi Abe, Yukinobu Imamura, Hiroyuki Takeuchi, Akira Kurome
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Patent number: 8602908Abstract: A shaft of the present invention has a tip reinforcing layer. A prepreg s9 for the tip reinforcing layer has a portion having a larger circumferential direction width Ws toward a tip side. The prepreg s9 for the tip reinforcing layer has a thickness Pt of 0.06 mm or greater and 0.12 mm or less. An edge Ds of the tip reinforcing layer extends in an axial direction of the shaft while circulating in a circumferential direction of the shaft. An average value Ha of the five heights h11 to h15 is equal to or less than 0.03 mm.Type: GrantFiled: April 19, 2010Date of Patent: December 10, 2013Assignee: SRI Sports LimitedInventor: Hiroyuki Takeuchi
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Patent number: 8587310Abstract: In the diffusion-weighted imaging, amounts of distortion and amounts of phase offset of k-space data due to a temporally changing magnetic field error induced by eddy currents and vibrations associated with application of a diffusion-weighted gradient magnetic field pulse are corrected with good precision to improve image quality. Characteristic data for correcting distortion of k-space data are calculated for every position in the slice direction as peak shifts of projections observed between the cases of applying and not applying an MPG pulse. As the characteristic data, amounts of distortion in the read-out direction and the phase encoding direction and phase offset amounts in a slice plane are calculated.Type: GrantFiled: July 22, 2009Date of Patent: November 19, 2013Assignee: Hitachi Medical CorporationInventors: Yo Taniguchi, Yoshitaka Bito, Shoichi Miyawaki, Hiroyuki Takeuchi, Suguru Yokosawa
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Publication number: 20130221968Abstract: There is provided a technique for suppressing increase of SAR without sacrificing sensitivity in RF coils used in MRI apparatuses. The present invention provides an antenna device comprising a sheet-shaped conductor and a ribbon-shaped conductor disposed on the subject side with respect to the sheet-shaped conductor with a predetermined distance from the sheet-shaped conductor. The ribbon-shaped conductor has a meandering shape, and is adjusted so as to resonate at transmission and reception frequencies, and it is constituted so that distance to the sheet-shaped conductor becomes smaller at both end part thereof along the static magnetic field direction compared with the distance to the sheet-shaped conductor at the center thereof. Moreover, the ribbon-shaped conductor is constituted so as to have a smaller width, as the distance to the sheet-shaped conductor becomes smaller.Type: ApplicationFiled: October 6, 2011Publication date: August 29, 2013Inventors: Hideta Habara, Yoshitaka Bito, Hisaaki Ochi, Yoshihisa Soutome, Masayoshi Dohata, Tetsuhiko Takahashi, Hiroyuki Takeuchi
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Publication number: 20130147481Abstract: Regardless of the measurement conditions, the degradation of the image quality due to a vibrational error magnetic field, which is generated by the vibration of the mechanical structure of an MRI apparatus, is reduced. In order to do so, error magnetic field image data indicating an error magnetic field distribution is acquired on the basis of an echo signal measured using a pulse sequence having a test gradient magnetic field, a parameter value of a damped vibration function showing a vibrational error magnetic field is calculated using the error magnetic field image data, and a correction magnetic field is calculated on the basis of the calculated parameter value of the damped vibration function showing the vibrational error magnetic field.Type: ApplicationFiled: August 18, 2011Publication date: June 13, 2013Inventors: Shouichi Miyawaki, Hiroyuki Takeuchi
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Publication number: 20130119991Abstract: A technique is provided to reserve large examination space in the tunnel type MRI apparatus, without increasing production cost nor reducing significantly irradiation efficiency and homogeneity in an irradiation distribution within an imaging region. The present invention provides an RF coil unit in which four partial cylindrical coils are placed with a gap therebetween in the circumferential direction inside a cylindrical RF shield, in such a manner that two pairs of the partial cylindrical coils are opposed to each other, and magnetic fields produced by the individual partial cylindrical coils are combined, thereby producing a circularly polarized wave field or an elliptically polarized wave field.Type: ApplicationFiled: July 25, 2011Publication date: May 16, 2013Inventors: Yoshihisa Soutome, Yoshitaka Bito, Hiroyuki Takeuchi, Tetsuhiko Takahashi, Hisaaki Ochi, Hideta Habara
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Patent number: 8384380Abstract: In order to stably obtain an even fat-suppressed image without reduction of an imaging efficiency and without being affected by unevenness of irradiation magnetic field of an RF pulse, when an imaging sequence having a first sequence part for suppressing a signal from a desired component of an examinee by applying a CHESS pulse and a second sequence part for measuring an echo signal from the examinee is repeated, the flip angle of the CHESS pulse is changed at plural times. In the case of multi-slice imaging, the flip angle of the CHESS pulse is changed in at lest two slice imaging.Type: GrantFiled: June 25, 2008Date of Patent: February 26, 2013Assignee: Hitachi Medical CorporationInventors: Takayuki Abe, Hiroyuki Takeuchi, Tetsuhiko Takahashi
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Publication number: 20130013282Abstract: An apparatus for monitoring nuclear thermal hydraulic stability of a nuclear reactor, contains: a calculation unit configured to calculate a stability index of a nuclear thermal hydraulic phenomenon based on nuclear instrumentation signals, the signals being outputted by a plurality of nuclear instrumentation detectors placed at regular intervals in a reactor core; a simulation unit configured to simulate the nuclear thermal hydraulic phenomenon based on a physical model by using information on an operating state of the nuclear reactor as an input condition; a limit value updating unit configured to update a limit value of the nuclear thermal hydraulic phenomenon based on a result of the simulation; and a determination unit configured to determine, based on the stability index and the limit value, whether or not to activate a power oscillation suppressing device.Type: ApplicationFiled: July 6, 2012Publication date: January 10, 2013Applicant: KABUSHIKI KAISHA TOSHIBAInventors: Yutaka TAKEUCHI, Hiroyuki TAKEUCHI, Kazuki YANO
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Publication number: 20120298221Abstract: A mass flow controller with high accuracy flow rate output control is disclosed. In the mass flow controller, relation data that indicates a corresponding relation between a flow rate of a reference gas and a CF value of a sample gas is stored, a target flow rate is converted into a reference gas flow rate by the use of a predetermined CF value, a sample gas flow rate is calculated from the converted reference gas flow rate and a CF value corresponding to the reference gas flow rate, the sample gas flow rate is compared with the target flow rate, and the CF value that is used for conversion of the reference gas flow rate or calculation of the sample gas flow rate is updated by the use of the corresponding relation based on the error between the sample gas flow rate and the target flow rate.Type: ApplicationFiled: December 22, 2010Publication date: November 29, 2012Applicant: HORIBA STEC, CO., LTD.Inventors: Hiroyuki Takeuchi, Yutaka Yoneda, Yasuhiro Isobe
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Publication number: 20120299594Abstract: There is provided a technique for securing a comfortable examination space in a tunnel type MRI apparatus without increasing the manufacturing cost of the MRI apparatus and sacrificing performance thereof. In an RF coil provided with a hollow-shaped outer conductive element and a strip-shaped conductive element disposed along the outer conductive element in the axial direction, meander lines constituting the strip-shaped conductive element are disposed at uneven distances from the outer conductive element to secure an internal space. In order to obtain uniform sensitivity at the center of the RF coil, the strip-shaped conductive element is constituted with N of connected meander lines, and length of the strip-shaped conductive element is adjusted so that, in the strip-shaped conductive element resonating at resonance frequency of the antenna, nodes are formed in a number of (M+1)×N?1, wherein M is 0 or a natural number of 1 or larger.Type: ApplicationFiled: January 21, 2011Publication date: November 29, 2012Applicant: Hitachi Medical CorporationInventors: Hideta Habara, Yoshitaka Bito, Hisaaki Ochi, Yoshihisa Soutome, Masayoshi Dohata, Tetsuhiko Takahashi, Hiroyuki Takeuchi
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Publication number: 20120262173Abstract: There is provided a technique for securing a large examination space in a tunnel type MRI device without inviting increase of manufacturing cost and without significantly reducing irradiation efficiency or uniformity of the irradiation intensity distribution in an imaging region. Between rungs of a partially cylindrical RF coil, which coil corresponds to a cylindrical RF coil of which part is removed, there are disposed half-loops generating magnetic fields, which are synthesized with magnetic fields generated by loops constituted by adjacent rungs of the partially cylindrical RF coil and rings connecting the rungs to generate a circularly polarized or elliptically polarized magnetic field. Further, high-frequency signals of the same reference frequency having a desired amplitude ratio and phase difference are supplied to the partially cylindrical RF coils and half-loops.Type: ApplicationFiled: November 29, 2010Publication date: October 18, 2012Applicant: HITACHI MEDICAL CORPORATIONInventors: Yoshihisa Soutome, Hideta Habara, Yoshitaka Bito, Hiroyuki Takeuchi, Tetsuhiko Takahashi, Hisaaki Ochi
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Publication number: 20120176137Abstract: In the magnetic resonance imaging device, the distance between the first and second coils is different in the circumferential direction and has a first region (A1) (?=0, ?) and a second region (A2) (?=?/2) narrower than the first region (A1). In the first coil, wiring patterns (17a, 17b) on the side of a zero-plane (F0) passing through the center of the first coil and perpendicular to the axis direction (z-axis direction) meander in the circumferential direction such that the wiring patterns (17a, 17b) depart from the zero-plane (F0) in the first region (A1) and approach the zero-plane (F0) in the second region (A2). This provides a gradient magnetic field coil capable of configuring wiring patterns without using a loop coil that does not pass through the z-axis.Type: ApplicationFiled: August 26, 2010Publication date: July 12, 2012Applicant: HITACHI MEDICAL CORPORATIONInventors: Masanao Terada, Mitsushi Abe, Yukinobu Imamura, Hiroyuki Takeuchi, Takeshi Yatsuo, Akira Kurome
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Publication number: 20120165109Abstract: A golf club 2 includes a shaft 6, a grip 8 mounted to an end part of the shaft 6, a cavity body 10 mounted to the end part of the shaft 6 to which the grip 8 is mounted, and a weight body 12 detachably mounted to the cavity body 10. The cavity body 10 includes a polymer. Preferably, an outer peripheral surface 16a of the cavity body 10 is mounted to an inner peripheral surface 6a of the shaft so as to abut on the inner peripheral surface 6a. Two or more projections are formed on one of the outer peripheral surface 16a of the cavity body 10 and the inner peripheral surface 6a of the shaft. Two or more recessed parts are formed on the other. The two or more projections are engaged with the two or more recessed parts.Type: ApplicationFiled: December 6, 2011Publication date: June 28, 2012Inventor: Hiroyuki TAKEUCHI
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Patent number: 8203342Abstract: A coil unit comprises a gradient coil which is disposed along a static magnetic field generating source, and a radio frequency coil which is disposed along the gradient coil in a test region at a position closer to the center of the test region compared with the gradient coil, and a conductor part which is disposed between the gradient coil and the radio frequency coil, and covers periphery of the radio frequency coil. The radio frequency coil comprises a first loop coil and a second loop coil locating in planes substantially perpendicular to direction of the static magnetic field, a plurality of linear conductors connecting the first loop coil and the second loop coil and substantially parallel to the direction of the static magnetic field, and a plurality of first capacitors disposed in the first loop coil and the second loop coil.Type: GrantFiled: December 13, 2007Date of Patent: June 19, 2012Assignees: Hitachi, Ltd., Hitachi Medical CorporationInventors: Hisaaki Ochi, Yoshihisa Soutome, Yoshitaka Bito, Takeshi Yatsuo, Hiroyuki Takeuchi
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Patent number: 8174263Abstract: A magnetic resonance imaging device includes a predetermined pulse sequence, the predetermined pulse sequence including an unnecessary material suppressing sequence unit for canceling a signal from an unnecessary material which is not a measurement target and a main imaging sequence unit for measuring a nuclear magnetic resonance signal used to create an image of an examinee. The unnecessary material suppressing sequence unit generates at least two or more high frequency magnetic field pulses so that the longitudinal magnetization of the unnecessary material is made spatially uniform in the imaging space under application of a first high frequency magnetic field pulse in the main imaging sequence unit.Type: GrantFiled: July 14, 2011Date of Patent: May 8, 2012Assignee: Hitachi Medical CorporationInventors: Takayuki Abe, Hiroyuki Takeuchi, Tetsuhiko Takahashi