Patents by Inventor Takahiro DOKI

Takahiro DOKI 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: 20180306734
    Abstract: An X-ray phase contrast imaging system includes an X-ray source, a detector, a plurality of gratings including a first grating and a second grating, and a grating positional displacement acquisition section configured to obtain a positional displacement of the grating based on a Fourier transform image obtained by Fourier transforming an interference fringe image detected by the detector.
    Type: Application
    Filed: April 20, 2018
    Publication date: October 25, 2018
    Inventors: Naoki MORIMOTO, Taro SHIRAI, Takahiro DOKI, Satoshi SANO, Akira HORIBA
  • Publication number: 20180279972
    Abstract: In an X-ray imaging device according to a first embodiment, an X-ray detector has a configuration in which scintillator elements are defined by light-shielding walls in a lattice shape. Among X-rays incident on the X-ray detector, X-rays incident on the light-shielding walls are not converted into scintillator light and are transmitted by the X-ray detector. Accordingly, by causing X-rays to be incident on the X-ray detector in which the scintillator elements are defined by the light-shielding walls in a lattice shape, an area in which X-rays 3a transmitted by a subject M are incident on the X-ray detector can be limited to an arbitrary range. Accordingly, since a detection mask can be omitted in the X-ray imaging device which is used for EI-XPCi, it is possible to reduce a manufacturing cost of the X-ray imaging device.
    Type: Application
    Filed: March 1, 2016
    Publication date: October 4, 2018
    Applicant: SHIMADZU CORPORATION
    Inventors: Koichi TANABE, Shingo FURUI, Toshinori YOSHIMUTA, Kenji KIMURA, Akihiro NISHIMURA, Taro SHIRAI, Takahiro DOKI, Satoshi SANO, Akira HORIBA, Toshiyuki SATO
  • Publication number: 20180226167
    Abstract: The method of producing this diffraction grating includes a step of generating a moire by a periodic pattern projected onto a plurality of unit diffraction gratings and a plurality of unit diffraction gratings, and a step of adjusting so that the extending directions of the gratings are aligned by relatively rotating at least one of a plurality of unit diffractions with respect to at least one of the others of the plurality of unit diffractions.
    Type: Application
    Filed: February 7, 2018
    Publication date: August 9, 2018
    Inventors: Takahiro DOKI, Yukihisa WADA, Satoshi TOKUDA, Nobukazu HAYASHI, Toshinori YOSHIMUTA
  • Publication number: 20180180558
    Abstract: This X-ray phase imaging apparatus includes an X-ray source, a detector, a plurality of gratings including a phase grating and an absorption grating, and an image processing unit for generating an image including a dark field image. The image processing unit generates an image including a dark field image from an image captured by placing the plurality of gratings at one or two predetermined positions.
    Type: Application
    Filed: September 27, 2017
    Publication date: June 28, 2018
    Inventors: Satoshi SANO, Taro SHIRAI, Takahiro DOKI, Akira HORIBA
  • Publication number: 20180172607
    Abstract: The X-ray phase imaging apparatus is configured to include an image generation unit that generates an X-ray phase-contrast image based on a phase-contrast between a step curve representing an intensity change of an X-ray when an object is placed between an X-ray source and a phase grating or between a phase grating and an absorption grating and a step curve when no object is placed therebetween, and is configured to obtain a displacement amount of relative positions of a plurality of gratings based on a plurality of step curves.
    Type: Application
    Filed: September 14, 2017
    Publication date: June 21, 2018
    Inventors: Satoshi SANO, Taro SHIRAI, Takahiro DOKI, Akira HORIBA
  • Publication number: 20180052240
    Abstract: A X-ray detector having enhanced X-ray sensitivity, which enables dual energy imaging having high diagnostic performance. This X-ray detector includes: scintillator elements which are partitioned by light blocking walls and which convert low-energy X-rays to light; and scintillator elements which are partitioned by light blocking walls and which convert high-energy X-rays to light. When seen from the direction of incidence of the X-rays, the positional pattern of the light blocking walls and that of the light blocking walls are configured so as not to be in alignment with each other. Accordingly, the X-rays incident on the X-ray detector are converted to light by at least either one of the scintillator elements and are finally outputted as X-ray detection signals.
    Type: Application
    Filed: January 26, 2016
    Publication date: February 22, 2018
    Applicant: SHIMADZU CORPORATION
    Inventors: Koichi Tanabe, Shingo Furui, Toshinori Yoshimuta, Kenji Kimura, Akihiro Nishimura, Taro Shirai, Takahiro Doki, Satoshi Sano, Akira Horiba, Toshiyuki Sato
  • Publication number: 20180042571
    Abstract: Provided is a radiation phase difference imaging apparatus in which a separation distance between a phase grating and a radiation detector is optimized. The separation distance between the phase grating and a detection surface of an FPD is determined based on the magnitude of noise corruption in a self-image projected onto the detection surface. The magnitude of the effect of the noise is used as a basis for assessing the separation distance. It is determined whether a distance Zd is appropriate for imaging, based on the magnitude of noise corruption in the self-image in a self-image picture which is obtained when the distance Zd is the distance between the phase grating and the detection surface of the FPD. The separation distance can thus be optimized based on actual conditions of an actual X-ray source that emits a plurality of types of X-rays.
    Type: Application
    Filed: March 6, 2015
    Publication date: February 15, 2018
    Applicant: Shimadzu Corporation
    Inventors: Satoshi SANO, Toshiyuki SATO, Koichi TANABE, Shingo FURUI, Toshinori YOSHIMUTA, Hiroyuki KISHIHARA, Takahiro DOKI, Akira HORIBA
  • Publication number: 20170343486
    Abstract: Provided is a radiation phase-contrast imaging device capable of assuredly detecting a self-image and precisely imaging the internal structure of an object. According to the configuration of the present invention, the longitudinal direction of a detection surface of a flat panel detector is inclined with respect to the extending direction of an absorber in a phase grating. This causes variations in the position (phase) of a projected stripe pattern of a self-image at different positions on the detection surface. This is therefore expected to produce the same effects as those obtainable when a plurality of self-images are obtained by performing imaging a plurality of times in such a manner that the position of the projected self-images on the detection surface varies. This alone, however, results in a single self-image phase for a specific region of the object.
    Type: Application
    Filed: November 20, 2015
    Publication date: November 30, 2017
    Inventors: Koichi TANABE, Shingo FURUI, Hiroyuki KISHIHARA, Kenji KIMURA, Taro SHIRAI, Takahiro DOKI, Satoshi SANO, Akira HORIBA
  • Patent number: 9306108
    Abstract: In an X-ray strip detector, at least one joining semiconductor film are formed on surface of a sensitive semiconductor film, on the part of X-strips and Y-strips, that is sensitive to incident X-rays to generate electric charge, and on at least an entire sensitive region of a conversion film. The joining semiconductor film has higher resistance value than resistance value of the sensitive semiconductor film. Accordingly, when the electric charge generated in the sensitive semiconductor film are collected in the X-strips and the Y-strips, movement of the electric charge into other adjacent strip electrodes is avoidable. Consequently, crosstalk can be suppressed that the electric charge leak to the adjacent strip electrodes.
    Type: Grant
    Filed: January 12, 2015
    Date of Patent: April 5, 2016
    Assignee: SHIMADZU CORPORATION
    Inventors: Takahiro Doki, Koichi Tanabe, Toshinori Yoshimuta, Hiroyuki Kishihara, Satoshi Sano
  • Publication number: 20150265227
    Abstract: Disclosed is an X-ray apparatus with an X-ray tube controller. The X-ray tube controller controls an X-ray tube so as for X-rays emitted from the X-ray tube to have an energy width whose upper limit is more than the minimum K-shell absorption edge of K-shell absorption edges for elements forming a conversion film and is equal to or less than a preset value depending on a K-shell absorption edge corresponding to a characteristic X-ray whose energy influences the blur. Accordingly, the less number of ejected K-shell characteristic X-rays is obtainable than the case when the emitted X-rays have an energy width whose upper limit is more than a preset value depending on the K-shell absorption edge corresponding to the characteristic X-ray whose energy influences the blur. This allows a suppressed blurred image generated from ejected K-shell characteristic X-rays outside a pixel area where X-rays enter to introduce a photoelectric effect.
    Type: Application
    Filed: March 19, 2015
    Publication date: September 24, 2015
    Inventors: Satoshi SANO, Toshiyuki SATO, Koichi TANABE, Toshinori YOSHIMUTA, Hiroyuki KISHIHARA, Takahiro DOKI
  • Publication number: 20150200323
    Abstract: In an X-ray strip detector, at least one joining semiconductor film are formed on surface of a sensitive semiconductor film, on the part of X-strips and Y-strips, that is sensitive to incident X-rays to generate electric charge, and on at least an entire sensitive region of a conversion film. The joining semiconductor film has higher resistance value than resistance value of the sensitive semiconductor film. Accordingly, when the electric charge generated in the sensitive semiconductor film are collected in the X-strips and the Y-strips, movement of the electric charge into other adjacent strip electrodes is avoidable. Consequently, crosstalk can be suppressed that the electric charge leak to the adjacent strip electrodes.
    Type: Application
    Filed: January 12, 2015
    Publication date: July 16, 2015
    Inventors: Takahiro DOKI, Koichi TANABE, Toshinori YOSHIMUTA, Hiroyuki KISHIHARA, Satoshi SANO
  • Patent number: 8895341
    Abstract: A method of manufacturing a radiation detector, comprising: a charge blocking layer generating step of generating a charge blocking layer on a substrate; a CdTe-layer generating step of generating a CdTe layer so as to cover the charge blocking layer on the substrate, the CdTe layer undergoing heterojunction to the charge blocking layer and being composed of a chlorine-doped polycrystalline film; and a heat treatment step of performing a heat treatment on the substrate having the CdTe layer formed thereon.
    Type: Grant
    Filed: March 4, 2013
    Date of Patent: November 25, 2014
    Assignee: Shimadzu Corporation
    Inventors: Satoshi Tokuda, Toshinori Yoshimuta, Hiroyuki Kishihara, Masatomo Kaino, Akina Yoshimatsu, Takahiro Doki, Toshiyuki Sato
  • Publication number: 20140080243
    Abstract: A method of manufacturing a radiation detector, comprising: a charge blocking layer generating step of generating a charge blocking layer on a substrate; a CdTe-layer generating step of generating a CdTe layer so as to cover the charge blocking layer on the substrate, the CdTe layer undergoing heterojunction to the charge blocking layer and being composed of a chlorine-doped polycrystalline film; and a heat treatment step of performing a heat treatment on the substrate having the CdTe layer formed thereon.
    Type: Application
    Filed: March 4, 2013
    Publication date: March 20, 2014
    Applicant: SHIMADZU CORPORATION
    Inventors: Satoshi TOKUDA, Toshinori YOSHIMUTA, Hiroyuki KISHIHARA, Masatomo KAINO, Akina YOSHIMATSU, Takahiro DOKI, Toshiyuki SATO