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    Radiation Phase Contrast Imaging Device
    3.
    发明申请
    Radiation Phase Contrast Imaging Device 审中-公开

    公开(公告)号：US20190056336A1

    公开(公告)日：2019-02-21

    申请号：US16081249

    申请日：2017-02-22

    申请人： SHIMADZU CORPORATION ,  OSAKA UNIVERSITY

    发明人： Takahiro DOKI ,  Koichi TANABE ,  Toshinori YOSHIMUTA ,  Kenji KIMURA ,  Akihiro NISHIMURA ,  Taro SHIRAI ,  Satoshi SANO ,  Akira HORIBA ,  Takayoshi SHIMURA ,  Heiji WATANABE ,  Takuji HOSOI

    IPC分类号： G01N23/041 ,  G01N23/20 ,  A61B6/00

    摘要： [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.

    X-RAY IMAGING APPARATUS
    6.
    发明申请
    X-RAY IMAGING APPARATUS 有权

    公开(公告)号：US20210059630A1

    公开(公告)日：2021-03-04

    申请号：US16958044

    申请日：2018-11-06

    申请人： Shimadzu Corporation

    发明人： Satoshi SANO ,  Kenji KIMURA ,  Taro SHIRAI ,  Takahiro DOKI ,  Akira HORIBA ,  Naoki MORIMOTO

    IPC分类号： A61B6/00

    摘要： 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).

    RADIATION IMAGING APPARATUS
    8.
    发明申请
    RADIATION IMAGING APPARATUS 审中-公开

    公开(公告)号：US20190175126A1

    公开(公告)日：2019-06-13

    申请号：US16309820

    申请日：2017-03-15

    申请人： Shimadzu Corporation

    发明人： Koichi TANABE ,  Toshinori YOSHIMUTA ,  Kenji KIMURA ,  Hiroyuki KISHIHARA ,  Yukihisa WADA ,  Takuro IZUMI ,  Taro SHIRAI ,  Takahiro DOKI ,  Satoshi SANO ,  Akira HORIBA

    IPC分类号： A61B6/00 ,  G01N23/046

    摘要： 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. This moire image of a long period changes in the positions due to the minute change in the relative position between the phase grating 5 and the absorption grating 6, so it becomes possible to detect the minute change of the relative position between the radiation source, the phase grating 5, and the absorption grating 6 from the image of the reference area.

    RADIATION PHASE CONTRAST IMAGING APPARATUS
    9.
    发明申请
    RADIATION PHASE CONTRAST IMAGING APPARATUS 审中-公开

    公开(公告)号：US20190101496A1

    公开(公告)日：2019-04-04

    申请号：US16046004

    申请日：2018-07-26

    申请人： Shimadzu Corporation

    发明人： Takahiro DOKI ,  Kenji KIMURA ,  Taro SHIRAI ,  Satoshi SANO ,  Akira HORIBA ,  Naoki MORIMOTO ,  Hiroshi MIZUSHIMA

    IPC分类号： G01N23/041

    摘要： A radiation phase contrast imaging apparatus is provided with an image signal generation system including an X-ray source and an image signal detector, a plurality of gratings including a first grating and a second grating, a holder for holding a plurality of gratings in a suspended manner, and a position switching mechanism for switching the relative position of the plurality of gratings with respect to the image signal generation system between the retracted position and the detection position. Either one of the plurality of gratings and the image signal generation system is held by a single holder.