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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Publication number: 20240102945Abstract: An X-ray phase imaging apparatus includes an X-ray source; a detector; a plurality of gratings; a rotation mechanism; an image processor configured to generate a phase contrast image and to generate a preview image prior to capture of the phase contrast image; and a controller configured to control function of displaying on a display the preview image, and function of discriminatively displaying on the display an image coverage area for the phase contrast image that is associated with a relative rotation angle between the plurality of gratings and a subject.Type: ApplicationFiled: July 20, 2023Publication date: March 28, 2024Applicant: Shimadzu CorporationInventors: Kana KOJIMA, Yuto MAEDA, Takahiro DOKI
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Publication number: 20230384244Abstract: An X-ray phase imaging apparatus includes an X-ray source; an X-ray detector; a plurality of gratings; a subject holder arranged in an X-ray irradiation area and configured to hold the subject; and an image processor configured to generate an X-ray phase contrast image based on an intensity distribution of the X-rays detected by the X-ray detector. The subject holder is formed of a first material having an X-ray transmittance greater than metal and a scattering degree smaller than the metal.Type: ApplicationFiled: July 7, 2021Publication date: November 30, 2023Applicant: Shimadzu CorporationInventors: Takahiro DOKI, Kenji KIMURA, Taro SHIRAI, Naoki MORIMOTO
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Publication number: 20230194441Abstract: This X-ray phase imaging system includes a plurality of gratings including a first grating that is irradiated with X-rays from an X-ray source and a second grating that is irradiated with X-rays from the first grating. The X-ray phase imaging system includes an imaging unit that optically images a subject and one or both of the first grating and the second grating.Type: ApplicationFiled: October 31, 2022Publication date: June 22, 2023Applicant: Shimadzu CorporationInventors: Bunta MATSUHANA, Yuto MAEDA, Jiro MASUDA, Kana KOJIMA, Takahiro DOKI
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Patent number: 11415529Abstract: The X-ray phase imaging apparatus includes an imaging system, a position switching mechanism for switching between a retracted position and an imaging position, a control unit for controlling switching between the retracted position and the imaging position, and an image processing unit for generating an X-ray phase contrast image based on the first image and the second image. The control unit is configured to control sequentially imaging at the retracted position and imaging at the imaging position.Type: GrantFiled: March 30, 2020Date of Patent: August 16, 2022Assignee: Shimadzu CorporationInventors: Takahiro Doki, Kenji Kimura, Taro Shirai, Satoshi Sano, Akira Horiba, Naoki Morimoto
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Patent number: 11386561Abstract: An X-ray imaging apparatus is configured to acquire a plurality of pieces of slice image data from volume data, acquire a plurality of pieces of first processed image data by performing first processing, acquire a plurality of pieces of second processed image data by performing second processing, detect edges of the subject based on the acquired plurality of pieces of the second processed image data, and acquire edge image data including detected edges of the subject.Type: GrantFiled: May 28, 2020Date of Patent: July 12, 2022Assignee: Shimadzu CorporationInventors: Naoki Morimoto, Kenji Kimura, Taro Shirai, Takahiro Doki
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Patent number: 11385190Abstract: The X-ray phase imaging apparatus includes an imaging system, a position switching mechanism for switching between a retracted position and an imaging position, a control unit for controlling switching between the retracted position and the imaging position, and an image processing unit for generating an X-ray phase contrast image based on the first image and the second image. The control unit is configured to control sequentially imaging at the retracted position and imaging at the imaging position.Type: GrantFiled: March 30, 2020Date of Patent: July 12, 2022Assignee: Shimadzu CorporationInventors: Takahiro Doki, Kenji Kimura, Taro Shirai, Satoshi Sano, Akira Horiba, Naoki Morimoto
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Patent number: 11327029Abstract: The X-ray imaging device (100) is provided with an X-ray source (1), a plurality of gratings, a moving mechanism (8), and an image processing unit (6). The image processing unit (6) is configured to generate a phase-contrast image (16) by associating a pixel value in each pixel of a subject (T) in a plurality of subject images (10) with phase values of a Moire fringe (30) at each pixel and aligning the pixel of the subject of the same position in the plurality of subject images.Type: GrantFiled: January 22, 2019Date of Patent: May 10, 2022Assignee: Shimadzu CorporationInventors: Satoshi Sano, Koichi Tanabe, Kenji Kimura, Yukihisa Wada, Satoshi Tokuda, Taro Shirai, Takahiro Doki, Akira Horiba, Naoki Morimoto
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Patent number: 11175241Abstract: This X-ray phase image capturing system (100) includes an X-ray source (1), a plurality of gratings, and a detector (4), a moving mechanism (8), and an image processing unit (5). The image processing unit (5) is configured to generate a phase-contrast image (15) based on a plurality of feature quantities (12) and feature quantities 14 extracted from a plurality of X-ray image sets (R) acquired by performing fringe scanning a plurality of times in a short time.Type: GrantFiled: November 27, 2018Date of Patent: November 16, 2021Assignee: Shimadzu CorporationInventors: Satoshi Sano, Kenji Kimura, Taro Shirai, Masanobu Sato, Takahiro Doki, Akira Horiba, Naoki Morimoto
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Patent number: 11172897Abstract: 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: GrantFiled: October 12, 2018Date of Patent: November 16, 2021Assignee: Shimadzu CorporationInventors: Kenji Kimura, Taro Shirai, Takahiro Doki, Satoshi Sano, Akira Horiba, Naoki Morimoto
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Patent number: 11154270Abstract: This X-ray imaging apparatus (100) includes a rotation mechanism (8) for relatively rotating an imaging system (200) constituted by an X-ray source (1), a detector (5), a first grating (2) and a second grating (3), and an image processing unit (6) for generating a dark-field image based on an X-ray intensity distribution at each of a plurality of rotation angles. The image processing unit (6) is configured to perform a scattering correction for reducing a dark-field signal of a pixel whose dark-field signal is larger than a threshold value (V1) among a plurality of pieces of pixels in the dark-field image to a set value (V2).Type: GrantFiled: November 6, 2018Date of Patent: October 26, 2021Assignee: Shimadzu CorporationInventors: Satoshi Sano, Kenji Kimura, Taro Shirai, Takahiro Doki, Akira Horiba, Naoki Morimoto
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Publication number: 20210172885Abstract: The X-ray imaging device (100) is provided with an X-ray source (1), a plurality of gratings, a moving mechanism (8), and an image processing unit (6). The image processing unit (6) is configured to generate a phase-contrast image (16) by associating a pixel value in each pixel of a subject (T) in a plurality of subject images (10) with phase values of a Moire fringe (30) at each pixel and aligning the pixel of the subject of the same position in the plurality of subject images.Type: ApplicationFiled: January 22, 2019Publication date: June 10, 2021Inventors: Satoshi SANO, Koichi TANABE, Kenji KIMURA, Yukihisa WADA, Satoshi TOKUDA, Taro SHIRAI, Takahiro DOKI, Akira HORIBA, Naoki MORIMOTO
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Patent number: 11013482Abstract: 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: GrantFiled: September 19, 2018Date of Patent: May 25, 2021Assignee: Shimadzu CorporationInventors: Naoki Morimoto, Kenji Kimura, Taro Shirai, Takahiro Doki, Satoshi Sano, Akira Horiba
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Publication number: 20210148839Abstract: This X-ray phase image capturing system (100) includes an X-ray source (1), a plurality of gratings, and a detector (4), a moving mechanism (8), and an image processing unit (5). The image processing unit (5) is configured to generate a phase-contrast image (15) based on a plurality of feature quantities (12) and feature quantities 14 extracted from a plurality of X-ray image sets (R) acquired by performing fringe scanning a plurality of times in a short time.Type: ApplicationFiled: November 27, 2018Publication date: May 20, 2021Inventors: Satoshi SANO, Kenji KIMURA, Taro SHIRAI, Masanobu SATO, Takahiro DOKI, Akira HORIBA, Naoki MORIMOTO
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Patent number: 10980501Abstract: The X-ray phase imaging apparatus includes a position switching mechanism for switching a relative position of one or more gratings between a retreated position which is an outside of a detection range on a detection surface of an image signal detector and a detection positon which is an inside of the detection range on the detection surface of the image signal detector and a focal diameter changing unit configured to change a focal diameter of the X-ray source in conjunction with switching of the relative position of the one or more gratings.Type: GrantFiled: April 20, 2018Date of Patent: April 20, 2021Assignee: Shimadzu CorporationInventors: Koichi Tanabe, Kenji Kimura, Toshinori Yoshimuta, Taro Shirai, Takahiro Doki, Satoshi Sano, Akira Horiba, Naoki Morimoto
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Publication number: 20210059630Abstract: This X-ray imaging apparatus (100) includes a rotation mechanism (8) for relatively rotating an imaging system (200) constituted by an X-ray source (1), a detector (5), a first grating (2) and a second grating (3), and an image processing unit (6) for generating a dark-field image based on an X-ray intensity distribution at each of a plurality of rotation angles. The image processing unit (6) is configured to perform a scattering correction for reducing a dark-field signal of a pixel whose dark-field signal is larger than a threshold value (V1) among a plurality of pieces of pixels in the dark-field image to a set value (V2).Type: ApplicationFiled: November 6, 2018Publication date: March 4, 2021Inventors: Satoshi SANO, Kenji KIMURA, Taro SHIRAI, Takahiro DOKI, Akira HORIBA, Naoki MORIMOTO
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Publication number: 20210027472Abstract: An X-ray imaging apparatus is configured to acquire a plurality of pieces of slice image data from volume data, acquire a plurality of pieces of first processed image data by performing first processing, acquire a plurality of pieces of second processed image data by performing second processing, detect edges of the subject based on the acquired plurality of pieces of the second processed image data, and acquire edge image data including detected edges of the subject.Type: ApplicationFiled: May 28, 2020Publication date: January 28, 2021Inventors: Naoki MORIMOTO, Kenji KIMURA, Taro SHIRAI, Takahiro DOKI
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Patent number: 10863958Abstract: 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: GrantFiled: September 18, 2018Date of Patent: December 15, 2020Assignee: Shimadzu CorporationInventors: Taro Shirai, Kenji Kimura, Takahiro Doki, Satoshi Sano, Akira Horiba, Naoki Morimoto
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Patent number: 10859512Abstract: Provided is a radiation imaging apparatus capable of performing precise imaging without performing pre-imaging in the absence of a subject. According to the present invention, it is possible to provide a radiation imaging apparatus capable of performing precise imaging without performing pre-imaging in the absence of a subject immediately before. That is, the apparatus of the present invention is provided with a phase grating 5 provided with a subject area and a reference area. Both areas each have a predetermined pattern that absorbs radiation, but the patterns are different from each other. In this area, an image of the phase grating 5 is observed in a moire pattern of a long period.Type: GrantFiled: March 15, 2017Date of Patent: December 8, 2020Assignee: Shimadzu CorporationInventors: Koichi Tanabe, Toshinori Yoshimuta, Kenji Kimura, Hiroyuki Kishihara, Yukihisa Wada, Takuro Izumi, Taro Shirai, Takahiro Doki, Satoshi Sano, Akira Horiba
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Patent number: 10837922Abstract: The X-ray imaging apparatus is provided with a plurality of gratings including an X-ray source and a first grating, a detector, a grating rotation mechanism for rotating a plurality of gratings respectively, and an image processor for generating at least a dark field image. The image processor is configured to generate a dark field image captured by arranging the grating at a plurality of angles in a plane orthogonal to the optical axis direction.Type: GrantFiled: August 29, 2018Date of Patent: November 17, 2020Assignee: Shimadzu CorporationInventors: Satoshi Sano, Taro Shirai, Takahiro Doki, Akira Horiba, Naoki Morimoto, Kenji Kimura, Hiroshi Mizushima
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Publication number: 20200333265Abstract: The X-ray phase imaging apparatus includes an imaging system, a position switching mechanism for switching between a retracted position and an imaging position, a control unit for controlling switching between the retracted position and the imaging position, and an image processing unit for generating an X-ray phase contrast image based on the first image and the second image. The control unit is configured to control sequentially imaging at the retracted position and imaging at the imaging position.Type: ApplicationFiled: March 30, 2020Publication date: October 22, 2020Inventors: Takahiro DOKI, Kenji KIMURA, Taro SHIRAI, Satoshi SANO, Akira HORIBA, Naoki MORIMOTO