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).
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Patent number: 10809210Abstract: This X-ray phase imaging apparatus (100) includes a controller (5) that generates a dark field image (Iv) with respect to each of a plurality of relative positions between a subject (S) and an imaging grating (G1) changed by an adjustment mechanism (3) to acquire a contrast of a region of interest (ROI) in the dark field image (Iv), and controls the adjustment mechanism (3) to adjust a relative position between the subject (S) and the imaging grating (G1) based on the acquired contrast.Type: GrantFiled: September 6, 2017Date of Patent: October 20, 2020Assignee: Shimadzu CorporationInventors: Akira Horiba, Taro Shirai, Takahiro Doki, Satoshi Sano
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Patent number: 10801971Abstract: 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: GrantFiled: April 20, 2018Date of Patent: October 13, 2020Assignee: Shimadzu CorporationInventors: Naoki Morimoto, Taro Shirai, Takahiro Doki, Satoshi Sano, Akira Horiba
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Patent number: 10786217Abstract: This X-ray phase-contrast imaging apparatus is equipped with a plurality of gratings and grating holders for holding the plurality of gratings. The plurality of gratings is arranged such that the extending direction of grating components of the plurality of gratings is oriented in a direction in which the positional displacement due to the grating holder becomes maximum in a plane orthogonal to an optical axis of the X-ray.Type: GrantFiled: June 7, 2018Date of Patent: September 29, 2020Assignee: Shimadzu CorporationInventors: Akira Horiba, Taro Shirai, Takahiro Doki, Satoshi Sano, Naoki Morimoto
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Patent number: 10772592Abstract: This X-ray phase contrast imaging apparatus (100) includes an X-ray source (1) that radiates continuous X-rays, a first grating (3) that forms a self-image, a second grating (4), a detector (5) that detects the continuous X-rays, and a third grating (2) arranged between the detector (5) and the first grating 3. The first grating (3), the second grating (4), and the third grating (2) are arranged so as to satisfy conditions of predetermined formulas.Type: GrantFiled: July 10, 2017Date of Patent: September 15, 2020Assignees: Shimadzu Corporation, OSAKA UNIVERSITYInventors: Satoshi Sano, Koichi Tanabe, Toshinori Yoshimuta, Kenji Kimura, Hiroyuki Kishihara, Yukihisa Wada, Takuro Izumi, Taro Shirai, Takahiro Doki, Akira Horiba, Takayoshi Shimura, Heiji Watanabe, Takuji Hosoi
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Patent number: 10739280Abstract: The radiation phase contrast imaging apparatus includes an X-ray source, a first grating, a second grating arranged between the X-ray source and the first grating, and a moving mechanism for moving an object stage for holding an object. The moving mechanism is configured to more the object stage to an X-ray source side of the first grating and a second grating side of the first grating opposite to the source side of the first grating.Type: GrantFiled: August 29, 2018Date of Patent: August 11, 2020Assignee: Shimadzu CorporationInventors: Takahiro Doki, Kenji Kimura, Taro Shirai, Satoshi Sano, Akira Horiba, Naoki Morimoto
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Publication number: 20200249178Abstract: A phase contrast X-ray imaging system includes an X-ray source; a plurality of gratings; a detector; a grating movement mechanism; and an image processor that generates a phase contrast image. The image processor generates the phase contrast image by using a pitch of an intensity change and a function which has the pitch as a variable and expresses the intensity change in a pixel value as a grating moves.Type: ApplicationFiled: September 19, 2018Publication date: August 6, 2020Applicant: Shimadzu CorporationInventors: Naoki MORIMOTO, Kenji KIMURA, Taro SHIRAI, Takahiro DOKI, Satoshi SANO, Akira HORIBA
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Patent number: 10729398Abstract: An X-ray phase contrast imaging device of the present invention can change an arrangement pitch of slits related to a multi-slit and an arrangement pitch of phase shift sections related to a phase grating. A positional relationship among the multi-slit 3b, the phase grating, and an FPD is determined based on the arrangement pitch of the slits related to the multi-slit, the arrangement pitch of the phase shift sections related to the phase grating, and an arrangement pitch of detection elements related to the FPD. Among these arrangement pitches, by changing the arrangement pitch of the slits and the arrangement pitch of the phase shift sections, the present invention can change the positional relationship among the multi-slit, the phase grating, and the FPD.Type: GrantFiled: July 28, 2017Date of Patent: August 4, 2020Assignees: Shimadzu Corporation, Osaka UniversityInventors: Satoshi Sano, Koichi Tanabe, Toshinori Yoshimuta, Kenji Kimura, Hiroyuki Kishihara, Yukihisa Wada, Takuro Izumi, Taro Shirai, Takahiro Doki, Akira Horiba, Takayoshi Shimura, Heiji Watanabe, Takuji Hosoi
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Patent number: 10732132Abstract: [PROBLEM TO BE SOLVED] To provide a radiation phase contrast imaging device having a small device configuration [SOLVING MEANS] The present invention focused on the findings that the distance between the phase grating 5 and the FPD 4 does not need to be the Talbot distance. The distance between the phase grating 5 and the FPD 4 can be more freely set. However, a self-image cannot be detected unless the self-image is sufficiently magnified with respect to the phase grating 5. The degree on how much the self-image is magnified on the FPD 4 with respect to the original phase grating 5 is determined by a magnification ratio X2/X1. Therefore, in the present invention, the magnification ratio is set to be the same as the magnification ratio in a conventional configuration. With this, even if the distance X2 between the radiation source 3 and the FPD 4 is reduced, a situation in which the self-image cannot be detected by the FPD 4 due to the excessively small size thereof does not occur.Type: GrantFiled: February 22, 2017Date of Patent: August 4, 2020Assignees: Shimadzu Corporation, OSAKA UNIVERSITYInventors: Takahiro Doki, Koichi Tanabe, Toshinori Yoshimuta, Kenji Kimura, Akihiro Nishimura, Taro Shirai, Satoshi Sano, Akira Horiba, Takayoshi Shimura, Heiji Watanabe, Takuji Hosoi
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Publication number: 20200205761Abstract: A radiation phase contrast imaging device includes an X-ray source, an X-ray detector configured to detect radiated X-rays, a plurality of gratings, an image processor configured to generate a reconstructed image from an X-ray image acquired from the X-ray detector, a display, and a controller configured or programmed to perform control to display, on the display, the X-ray image before reconstruction and the reconstructed image generated by the image processor.Type: ApplicationFiled: October 12, 2018Publication date: July 2, 2020Applicant: Shimadzu CorporationInventors: Kenji KIMURA, Taro SHIRAI, Takahiro DOKI, Satoshi SANO, Akira HORIBA, Naoki MORIMOTO
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Publication number: 20200196969Abstract: This X-ray phase difference imaging system (100) includes an X-ray source (1), a plurality of gratings, a detector (4), and an image processor (6), in which the image processor (6) is configured to correct an artifact of a second phase contrast image (10b) that is reconstructed by using a first X-ray image (9a) and a third X-ray image (9c), on the basis of a first phase contrast image (10a) that is reconstructed by using the first X-ray image (9a) and a second X-ray image (9b).Type: ApplicationFiled: September 18, 2018Publication date: June 25, 2020Applicant: Shimadzu CorporationInventors: Taro SHIRAI, Kenji KIMURA, Takahiro DOKI, Satoshi SANO, Akira HORIBA, Naoki MORIMOTO
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Publication number: 20200158662Abstract: This X-ray phase contrast imaging apparatus (100) includes an X-ray source (1), a first grating (3) that forms a self-image, a second grating (4), a detector (5) that detects X-rays, an adjustment mechanism (6), and a controller (7) that controls the adjustment mechanism (6) to adjust a misalignment of the first grating (3) or a misalignment of the second grating (4) based on Moire fringes detected by the detector (5).Type: ApplicationFiled: July 10, 2017Publication date: May 21, 2020Inventors: Akira HORIBA, Koichi TANABE, Toshinori YOSHIMUTA, Kenji KIMURA, Hiroyuki KISHIHARA, Yukihisa WADA, Takuro IZUMI, Taro SHIRAI, Takahiro DOKI, Satoshi SANO, Takayoshi SHIMURA, Heiji WATANABE, Takuji HOSOI
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Patent number: 10656103Abstract: 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: GrantFiled: September 14, 2017Date of Patent: May 19, 2020Assignee: Shimadzu CorporationInventors: Satoshi Sano, Taro Shirai, Takahiro Doki, Akira Horiba
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Patent number: 10643760Abstract: 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: GrantFiled: February 7, 2018Date of Patent: May 5, 2020Assignee: Shimadzu CorporationInventors: Takahiro Doki, Yukihisa Wada, Satoshi Tokuda, Nobukazu Hayashi, Toshinori Yoshimuta
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Patent number: 10620140Abstract: The X-ray imaging apparatus is provided with an X-ray source, a plurality of gratings including a first grating and a second grating, a detector, a rotation mechanism for relatively rotating a subject including a fiber bundle and an imaging system, and an image processor for generating a dark field image. The image processor is configured to obtain a three-dimensional dark field image of the subject including at least the fiber bundle from a plurality of dark field images captured at a plurality of rotation angles.Type: GrantFiled: September 5, 2018Date of Patent: April 14, 2020Assignee: Shimadzu CorporationInventors: Satoshi Sano, Taro Shirai, Takahiro Doki, Akira Horiba, Naoki Morimoto
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Patent number: 10598611Abstract: This X-ray phase imaging apparatus is provided with a control unit that acquires information on a defect of a material based on a dark field image of the material.Type: GrantFiled: July 12, 2018Date of Patent: March 24, 2020Assignee: Shimadzu CorporationInventors: Satoshi Sano, Taro Shirai, Takahiro Doki, Akira Horiba, Naoki Morimoto
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Patent number: 10588591Abstract: The X-ray imaging apparatus is equipped with an image processing unit for performing a position adjustment of a first dark field image and a second dark field image based on a positional difference amount between a first absorption image of an object and a second absorption image of the object.Type: GrantFiled: June 7, 2018Date of Patent: March 17, 2020Assignee: Shimadzu CorporationInventors: Satoshi Sano, Taro Shirai, Takahiro Doki, Akira Horiba, Naoki Morimoto
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Publication number: 20190343472Abstract: An X-ray phase contrast imaging device of the present invention can change an arrangement pitch of slits related to a multi-slit and an arrangement pitch of phase shift sections related to a phase grating. A positional relationship among the multi-slit 3b, the phase grating, and an FPD is determined based on the arrangement pitch of the slits related to the multi-slit, the arrangement pitch of the phase shift sections related to the phase grating, and an arrangement pitch of detection elements related to the FPD. Among these arrangement pitches, by changing the arrangement pitch of the slits and the arrangement pitch of the phase shift sections, the present invention can change the positional relationship among the multi-slit, the phase grating, and the FPD.Type: ApplicationFiled: July 28, 2017Publication date: November 14, 2019Inventors: Satoshi SANO, Koichi TANABE, Toshinori YOSHIMUTA, Kenji KIMURA, Hiroyuki KISHIHARA, Yukihisa WADA, Takuro IZUMI, Taro SHIRAI, Takahiro DOKI, Akira HORIBA, Takayoshi SHIMURA, Heiji WATANABE, Takuji HOSOI
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Patent number: 10441234Abstract: An X-ray phase-contrast imaging device capable of easily performing imaging of an object using X-rays of plural energies is provided. The disclosed exemplary configuration includes an X-ray source of a dual energy output type, and an FPD having a high energy X-ray detection surface and a low energy X-ray detection surface so that two types of imaging, imaging by high energy X-ray and imaging by low energy X-ray, can be performed. By imaging so as to scan the object while changing the relative position of the imaging system and the object, two types of imaging can be completed at once.Type: GrantFiled: June 15, 2017Date of Patent: October 15, 2019Assignee: Shimadzu CorporationInventors: Koichi Tanabe, Shingo Furui, Hiroyuki Kishihara, Kenji Kimura, Taro Shirai, Takahiro Doki, Satoshi Sano, Akira Horiba
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Publication number: 20190293577Abstract: This X-ray phase imaging apparatus (100) includes a controller (5) that generates a dark field image (Iv) with respect to each of a plurality of relative positions between a subject (S) and an imaging grating (G1) changed by an adjustment mechanism (3) to acquire a contrast of a region of interest (ROI) in the dark field image (Iv), and controls the adjustment mechanism (3) to adjust a relative position between the subject (S) and the imaging grating (G1) based on the acquired contrast.Type: ApplicationFiled: December 8, 2016Publication date: September 26, 2019Inventors: Akira HORIBA, Taro SHIRAI, Takahiro DOKI, Satoshi SANO
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Patent number: 10393890Abstract: 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: GrantFiled: March 1, 2016Date of Patent: August 27, 2019Assignee: SHIMADZU CORPORATIONInventors: Koichi Tanabe, Shingo Furui, Toshinori Yoshimuta, Kenji Kimura, Akihiro Nishimura, Taro Shirai, Takahiro Doki, Satoshi Sano, Akira Horiba, Toshiyuki Sato