Patents by Inventor Hitoshi Kanazawa

Hitoshi Kanazawa 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: 20070083105
    Abstract: A magnetic resonance imaging apparatus includes a blood flow velocity acquiring unit that acquires a flow velocity of the blood flow of an object, a capturing condition setting unit that, on the basis of the flow velocity of the blood flow acquired by the blood flow velocity acquiring unit, sets at least one of a transmitting phase of a transmitted exciting pulse, a transmitting phase of a refocusing pulse, a shift amount of the relative phase difference between the transmitted exciting phase and the refocusing pulse, and an intensity of a gradient pulse in a readout direction as a capturing condition, and a blood flow image capturing unit that creates a blood flow image of the object by performing an imaging scan on the basis of the capturing condition set by the capturing condition setting unit.
    Type: Application
    Filed: September 21, 2006
    Publication date: April 12, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Mitsue Miyazaki, Hitoshi Kanazawa
  • Publication number: 20050151538
    Abstract: A magnetic resonance imaging apparatus includes: a sensitivity map database that stores sensitivity map data of a multi-coil including plural coils necessary for parallel imaging unfolding processing; a data slicing unit that slices partial data from three-dimensional volume data collected for the respective coils by parallel imaging, respectively; an intermediate image reconstructing unit that executes reconstruction processing for the partial data to thereby reconstruct intermediate images for the respective coils; and a reference image generating unit that slices sensitivity map data corresponding to the intermediate images from the sensitivity map database as sensitivity map data for unfolding processing, executes the parallel imaging unfolding processing for the intermediate images using the sensitivity map data for unfolding processing, and generates reference images.
    Type: Application
    Filed: January 12, 2005
    Publication date: July 14, 2005
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Nobuyasu Ichinose, Yoshio Machida, Hitoshi Kanazawa, Shinichi Uchizono
  • Patent number: 6830782
    Abstract: A method of modifying a polymeric material which comprises the steps of activation-treatment and a hydrophilic polymer-treatment, or comprises the steps of activation-treatment, a hydrophilic polymer-treatment, and monomer grafting in this order, or comprises the step of a solvent-treatment followed by these steps. Thus, the polymeric material, e.g., polyolefin, is improved in hydrophilicity, adhesion, etc. without lowering the practical strength thereof. The polymeric material thus improved in adhesion and other properties can be used in many applications where water absorption and adhesion are required, such as an absorption material, e.g., a wiping/cleansing material, a water retention material, a material for microorganism culture media, a separator for batteries (or cells), a synthetic paper, a filter medium, a textile product for clothing, a medical/sanitary/cosmetic supply, and reinforcing fibers for composite materials.
    Type: Grant
    Filed: August 27, 2001
    Date of Patent: December 14, 2004
    Inventor: Hitoshi Kanazawa
  • Publication number: 20040242794
    Abstract: A method of modifying a polymeric material whereby the polymeric material is modified to give a highly durable surface without decreasing its strength. Namely, a polymeric material is modified by the method comprising a combination of an impregnation step, an activation step, a step of grafting a monomer and a step of a treatment with a hydrophilic polymer. Thus, the hydrophilic nature, adhesiveness, and so forth of polymeric materials such as polyolefins can be improved without causing any decrease in the practical strength. The thus obtained polymeric materials are usable in articles with a need for high water absorptivity and high adhesiveness, for example, water-absorbing materials and water-retaining materials for medical, sanitary, cosmetic articles or supplies, agricultural materials, synthetic papers, filters and fiber products for clothes, for improving adhesiveness of composite materials and the like.
    Type: Application
    Filed: June 17, 2004
    Publication date: December 2, 2004
    Inventor: Hitoshi Kanazawa
  • Publication number: 20040049106
    Abstract: In the black blood method using a double inversion pulse, images in the systole of the cardiac cycle can be captured in a reliable manner even in the presence of a cycle-to-cycle variance in the heart beat cycle. A pulse sequence of the black blood method composed of a double inversion pulse DIV and an imaging pulse train SEQima is used. This sequence is applied in sync with an ECG signal of a subject to be imaged, and magnetic resonance imaging is thereby performed. The double inversion DIV is applied in sync with an R-wave:R1 appearing on the ECG signal at a given timing, with a first delay time td1 (fixed value), and the imaging pulse train SEQima is applied in sync with the following R-wave:R2 with a second delay time td2 (fixed value: set in accordance with the systole). A variance of the cardiac cycle is absorbed in an inversion time BBTI.
    Type: Application
    Filed: September 12, 2003
    Publication date: March 11, 2004
    Inventor: Hitoshi Kanazawa
  • Patent number: 6584870
    Abstract: A shift lever device having a shift lever which allows selection of an arbitrary shift range by shift operation and includes a support which rotatably supports the shift lever and includes breakable portions which break when an impact force above a preselected magnitude is applied to the shift lever. Accordingly, when an axial impact force indicative of a sudden deceleration is applied to the shift lever, the support is broken. The breakage of the support allows safer absorption of the impact force applied to the shift lever. The breakable portions may take the form of a frangible pin or bracket that pivotally supports the shift lever.
    Type: Grant
    Filed: July 3, 2001
    Date of Patent: July 1, 2003
    Assignee: Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho
    Inventors: Masaya Nishimura, Kazuhiro Sato, Masaki Fujita, Yoshitaka Watanabe, Hitoshi Kanazawa, Noriyasu Shamoto
  • Patent number: 6567685
    Abstract: A magnetic resonance imaging apparatus generates an MR signal from an object by applying a gradient field pulse generated by a gradient field coil and a high-frequency magnetic field pulse generated by a high-frequency coil to the object in a static field, and reconstructs an image on the basis of the MR signal. The gradient field coil is housed in a sealed vessel. The internal air in the sealed vessel is exhausted by the pump to prevent noise. By controlling the operation of the pump using a control circuit, noise in imaging operation can be reduced more effectively.
    Type: Grant
    Filed: January 19, 2001
    Date of Patent: May 20, 2003
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hiromitsu Takamori, Ayumi Katsunuma, Hitoshi Kanazawa, Takeshiro Suzuki, Seiji Nozaki, Masatoshi Hanawa, Yoshio Machida, Masaaki Yamanaka, Masao Yui
  • Publication number: 20030087982
    Abstract: A method of modifying a polymeric material which comprises the steps of activation-treatment and a hydrophilic polymer-treatment, or comprises the steps of activation-treatment, a hydrophilic polymer-treatment, and monomer grafting in this order, or comprises the step of a solvent-treatment followed by these steps. Thus, the polymeric material, e.g., polyolefin, is improved in hydrophilicity, adhesion, etc. without lowering the practical strength thereof The polymeric material thus improved in adhesion and other properties can be used in many applications where water absorption and adhesion are required, such as an absorption material, e.g., a wiping/cleansing material, a water retention material, a material for microorganism culture media, a separator for batteries (or cells), a synthetic paper, a filter medium, a textile product for clothing, a medical/sanitary/cosmetic supply, and reinforcing fibers for composite materials.
    Type: Application
    Filed: August 27, 2001
    Publication date: May 8, 2003
    Inventor: Hitoshi Kanazawa
  • Publication number: 20010037700
    Abstract: There is provided a shift lever device which comprises a shift lever which allows selection of an arbitrary shift range by shift operation and also comprises supporting means which rotatably supports the shift lever and is broken due to axial impact force applied to the shift lever. Accordingly, when axial impact force (strong force) is applied to the shift lever, the supporting means is broken. The breakage of the supporting means allows absorption of the impact force applied to the shift lever. Namely, in the shift lever device of the present invention, the impact force applied to the shift lever is absorbed due to the breakage of the supporting means. For this reason, an absorbing ability to the impact force is improved as compared with a conventional shift lever device.
    Type: Application
    Filed: July 3, 2001
    Publication date: November 8, 2001
    Inventors: Masaya Nishimura, Kazuhiro Sato, Masaki Fujita, Yoshitaka Watanabe, Hitoshi Kanazawa, Noriyasu Shamoto
  • Patent number: 6286385
    Abstract: A shift lever device includes a shift lever which allows selection of an arbitrary shift range by shift operation and which is rotatably supported by a structure that breaks when an axial impact force above a preselected magnitude is applied to the shift lever. The breakage of the supporting structure allows safer absorption of an impact force applied to the shift lever. The breakable supporting structure may take the form of a portion of a thin portion of a circular wall forming a bearing that rotatably supports the shift lever, or a frangible pin or bracket that pivotably supports the shift lever.
    Type: Grant
    Filed: December 2, 1997
    Date of Patent: September 11, 2001
    Assignee: Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho
    Inventors: Masaya Nishimura, Kazuhiro Sato, Masaki Fujita, Yoshitaka Watanabe, Hitoshi Kanazawa, Noriyasu Shamoto
  • Publication number: 20010010464
    Abstract: A magnetic resonance imaging apparatus generates an MR signal from an object by applying a gradient field pulse generated by a gradient field coil and a high-frequency magnetic field pulse generated by a high-frequency coil to the object in a static field, and reconstructs an image on the basis of the MR signal. The gradient field coil is housed in a sealed vessel. The internal air in the sealed vessel is exhausted by the pump to prevent noise. By controlling the operation of the pump using a control circuit, noise in imaging operation can be reduced more effectively.
    Type: Application
    Filed: January 19, 2001
    Publication date: August 2, 2001
    Inventors: Hiromitsu Takamori, Ayumi Katsunuma, Hitoshi Kanazawa, Takeshiro Suzuki, Seiji Nozaki, Masatoshi Hanawa, Yoshio Machida, Masaaki Yamanaka, Masao Yui
  • Patent number: 6144202
    Abstract: A pair of gradient field pulses of the same applied time and the same intensity are applied before and after a radio-frequency (RF) refocusing pulse (180.degree. pulse) as additional gradient field pulses to enhance the phase shift of a transverse magnetization spin, caused by the diffusion of a molecule including a target nuclide. To compensate for image deterioration caused by an unnecessary field distribution which is produced by the additional gradient field pulses, a compensation gradient field pulse dGcp and a compensation offset gradient field dGoffset are applied and a center frequency at the time of receiving and detecting an echo signal is shifted by df.sub.0.
    Type: Grant
    Filed: March 9, 1998
    Date of Patent: November 7, 2000
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hitoshi Kanazawa, Hiroshi Takai
  • Patent number: 5992261
    Abstract: In a shift lever to which operating force for changing a transmission by a driver is applied, a basal end thereof is inserted in a hole formed in a lever holder. Movement of the shift lever in the axial direction is prevented by an elastic member. When large force acts in the axial direction of the shift lever, the elastic member deflects and the shift lever moves in the axial direction, thereby allowing absorption of the load applied to the shift lever.
    Type: Grant
    Filed: January 23, 1998
    Date of Patent: November 30, 1999
    Assignee: Kabushiki Kaisha Tokai-Rika-Denki-Seisakusho
    Inventors: Hajime Iwata, Hitoshi Kanazawa
  • Patent number: 5942897
    Abstract: An RF pulse is applied to an object lying in an imaging region to which a static field is also applied. By applying a read-out gradient field to the object, gradient echoes are generated so that image reconstruction echo data are acquired. In addition to the image reconstruction echo data, two kinds of correction echo data are acquired at the same echo time but with the opposite read-out gradient field. These correction echo data have the same phase error component due to the inhomogeneity of the static field since the echo time is the same. These correction echo data have the opposite phase error component due to the eddy magnetic field in polarity. Therefore, a phase error caused by the eddy magnetic field can be corrected on the basis of these correction data.
    Type: Grant
    Filed: December 31, 1996
    Date of Patent: August 24, 1999
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hitoshi Kanazawa
  • Patent number: 5818229
    Abstract: There is a method of correcting an imaging pulse sequence magnetically applied by an imaging scan to an object. The method comprises a step of performing a first prescan to the object with a first preliminary pulse sequence including an RF excitation pulse and a plurality of RF refocusing pulses each having an application phase set to a specified phase value (for example, 90.degree.) and a step of performing a second prescan to the object with a second preliminary pulse sequence including an RF excitation pulse and a plurality of RF refocusing pulses of which even-numbered RF refocusing pulse has an application phase set to another specified phase value (for example, 270.degree.) differed by 180.degree. from the specified phase value. The method further comprises a step of correcting the imaging pulse sequence on the basis of first and second echo data groups provided by the first and second prescan, prior to the imaging scan.
    Type: Grant
    Filed: April 24, 1996
    Date of Patent: October 6, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hitoshi Kanazawa
  • Patent number: 5779636
    Abstract: A method of acquiring MR echo data and MRI system to reconstruct a three or more dimensional image of an object use a "hybrid echo volume imaging (EVI)" technique. In the hybrid EVI, applied to the object at predetermined timings are one RF excitation pulse concurrently with a slice-selective pulse, a readout gradient pulse, and a plurality of RF refocusing pulses. After each of the plurality of RF refocusing pulses, applied to the object is a slice-encoding gradient pulse having a first encoding value changed at every application of each of the RF refocusing pulses. After the slice-encoding gradient pulse, applied are a plurality of further readout magnetic gradient pulses whose polarities are alternately inverted, thereby a plurality of echoes are generated from the object in response to inversion of the polarities.
    Type: Grant
    Filed: April 28, 1995
    Date of Patent: July 14, 1998
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hitoshi Kanazawa
  • Patent number: 5587657
    Abstract: A magnetic resonance imaging apparatus comprises a static magnetic field forming magnet, gradient coils, a transmitter for transmitting an excitation pulse directed at a phantom, with the phantom having a non-magnetic material containing candidate nuclear species for magnetic resonance and having a periodic structure along the phase encoding direction. The magnetic resonance imaging apparatus further has a receiver for receiving echo signals from the non-magnetic material with the echo signals being outputted as echo data, a sequencer for controlling the gradient coils, the transmitter and the receiver thereby generating a plurality of echo signals of varying echo times at each excitation pulse while varying the strength of the phase-encoding gradient magnetic field pulses. The sequencer further controls the acquisition of the echo data required to reconstruct a MR image in split scans on the Fourier space.
    Type: Grant
    Filed: January 26, 1994
    Date of Patent: December 24, 1996
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hitoshi Kanazawa
  • Patent number: 5565776
    Abstract: An excitation pulse, a first refocusing pulse, and a second refocusing pulse are sequentially applied, a flow encode pulse for producing a phase shift in accordance with the velocity of a fluid is applied before the second refocusing pulse, an echo signal is observed after the application of the second refocusing pulse, and a velocity image is reconstructed on the basis of the echo signal. The application phases of the excitation pulse, the first refocusing pulse, and the second refocusing pulse, and the flip angles of the first and second refocusing pulses, are so adjusted that the intensity of the echo signal from the fluid changes in accordance with the velocity. In a stationary part, the absolute value of a spin echo component and the absolute value of a stimulated echo component are equal, and the phase difference between them is 180.degree.. That is, the signal in the stationary part is essentially 0.
    Type: Grant
    Filed: August 23, 1995
    Date of Patent: October 15, 1996
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hitoshi Kanazawa
  • Patent number: 5508612
    Abstract: A magnetic resonance imaging apparatus is provided which generates a plurality of echoes by applying a 90.degree. RF pulse for magnetically exciting spins and subsequently repetitively applying a 180.degree. RF pulse for inverting the phase of the magnetized spin. In this apparatus, a pulse sequence is so performed as to enable any specific interval, out of an interval from the application of a 90.degree. RF pulse until a first echo is obtained and intervals each-between sequential adjacent two echoes, to be made to correspond to a 3 or more odd multiple of any other intervals.
    Type: Grant
    Filed: September 20, 1994
    Date of Patent: April 16, 1996
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Hitoshi Kanazawa
  • Patent number: 4913543
    Abstract: A mirror angle adjusting device for a door mirror assembly for use in motor vehicles has an operating lever, and first and second connecting members for sequentially transmitting to a mirror holder vertical and horizontal movements of the lever for angle adjustment. Smooth operation of the angle adjustment of a mirror can be performed by a connection between the lever and the first connecting member, and between the first connecting member and the second connecting member. The first connecting member can include a first joint for connecting with the lever, and a second joint for connecting the first joint with the second connecting member.
    Type: Grant
    Filed: November 3, 1988
    Date of Patent: April 3, 1990
    Assignee: Kabushiki Kaisha Tokai Rika Denki Seisakusho
    Inventors: Shinji Haba, Hitoshi Kanazawa