Patents by Inventor Kazuto Nakabayashi

Kazuto Nakabayashi 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).

  • Patent number: 5028871
    Abstract: A magnetic resonance imaging system includes a static magnetic field generating section, a gradient magnetic field applying section, an RF pulse applying section, a sequence control section, a receiving section, and an imaging processing section. The sequence control section controls a sequence so as to generate a 180.degree. pulse at a timing at which a peak of the 180.degree. pulse appears at t=TE'/2, assuming that TE'=TE-n.tau.c (where TE is the echo time for a proton, .tau.c is the period in which phases of spins of water and fat match with each other and which is obtained on the basis of a chemical shift amount of protons of water and fat, and n is an integer of 1 or more), and a peak of a 90.degree. pulse appears at t=0, generate a read gradient magnetic field Gr whose strength condition is set to cause an echo peak to appear at t=TE=TE'+n.tau.c, and generate a slicing gradient magnetic field Gs whose strength condition is set to obtain a predetermined view angle .theta.
    Type: Grant
    Filed: August 29, 1989
    Date of Patent: July 2, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kazuto Nakabayashi
  • Patent number: 5028872
    Abstract: A magnetic resonance imaging (MRI) system which includes a main shield member arranged in the cylindrical housing; and a sub shield member which is electrically connected to the main shield member and is arranged outside the housing to cover a region where the object under examination is placed. Thus, a magnetic resonance signal can be prevented from being electromagnetically mixed with the disturbance electromagnetic wave, and an MRI image can be accurately formed. The sub shield member covers only a desired region of a patient. For this reason, the patient can satisfactorily receive external light, the feeling of oppression can be greatly eliminated, and the shield member can be rendered compact. The sub shield member includes a lid shield member which is detachably attached to the main shield member, and a cover shield member which covers a portion extending from the main shield member.
    Type: Grant
    Filed: August 11, 1989
    Date of Patent: July 2, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kazuto Nakabayashi
  • Patent number: 4983918
    Abstract: A magnetic resonance imaging system includes a static magnetic field generating section, a gradient magnetic field applying section, an RF pulse applying section, a sequence control section, a receiving section, and an imaging processing section. The sequence control section controls a sequence so as to generate a 180.degree. pulse at a timing at which a peak of the 180.degree. pulse appears at t=TE'/2, assuming that TE'=TE-n.tau.c (where TE is the echo time for a proton, .tau.c is the period in which phases of spins of water and fat match with each other and which is obtained on the basis of a chemical shift amount of protons of water and fat, and n is an integer of 1 or more), and a peak of a 90.degree. pulse appears at t-0, generate a read gradient magnetic field Gr whose strength condition is set to cause an echo peak to appear at t=TE=TE'+n.tau.c, and generate a second 180.degree. pulse at T.pi.2 for an echo time TE2' for a second MR echo signalT.pi.2=(TE2'-TE1)/2.
    Type: Grant
    Filed: August 29, 1989
    Date of Patent: January 8, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kazuto Nakabayashi
  • Patent number: 4950992
    Abstract: A magnetic resonance imaging system includes a static field generating section, a gradient field applying section, high-frequency pulse applying section, a sequence control section, a receiving section and an imaging processing section. The sequence control section generates a 180.degree. pulse at a timing at which a center of the 180.degree. pulse appears at time t=TE'/2 when a center of a 90.degree. pulse appears at time t=0 under the condition TE'=TE-N.tau.c (where TE is an echo time with respect to a proton, .tau.c is a period in which phases of spins of the proton and fat match with each other and which is obtained on the basis of a chemical shift of protons of water and the fat, and n is an integer not less than 1), and generates a read gradient field Gr such that its intensity is set to allow an echo peak to appear at time t=TE=TE'+n.tau.c.
    Type: Grant
    Filed: May 22, 1989
    Date of Patent: August 21, 1990
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Kazuto Nakabayashi, Masatoshi Hanawa
  • Patent number: 4845430
    Abstract: A magnetic resonance imaging system includes a field generation section, an excitation section, an excitation control section, a resonance data acquisition section, and an image generation section. The field generation section generates a static magnetic field, a gradient magnetic field, and a selective excitation pulse. The excitation section controls the field generation section to apply the static field, the gradient field, and the pulse to an object, at a predetermined timing, to selectively excite a magnetic resonance phenomenon in a specific slice of the object. The excitation control section controls the excitation section to excite a plurality of slices. The excitation control section causes the excitation section to excite a certain slice of the object, and causes the excitation section to excite another slice, separated from the previous slice at least by a thickness of the slice determined by the selective excitation pulse, within an excitation-repeating time.
    Type: Grant
    Filed: June 29, 1987
    Date of Patent: July 4, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kazuto Nakabayashi
  • Patent number: 4799014
    Abstract: In a method of setting the intensity of a high-frequency magnetic field, in order to adjust and set a field intensity of the high-frequency magnetic field in a magnetic resonance imaging system, an amplitude of an excitation high-frequency magnetic field pulse is sequentially changed; magnetic resonance excitation and reading of a magnetic resonance signal are repeatedly performed; and the amplitude of the high-frequency magnetic field pulse, which corresponds to a maximum or minimum value of the magnetic resonance signal of the signals obtained by a plurality of excitation cycles, is used as a reference to set the intensity of the high-frequency magnetic field. An opposite phase high-frequency magnetic field pulse, having the same amplitude as that of the excitation high-frequency magnetic field pulse, and having a carrier wave which is 180.degree.
    Type: Grant
    Filed: December 11, 1987
    Date of Patent: January 17, 1989
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Kazuto Nakabayashi