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1. 发明授权

US10022099B2 X-ray image pickup apparatus, X-ray image pickup method, and X-ray image pickup apparatus monitoring method 有权
公开(公告)号：US10022099B2
公开(公告)日：2018-07-17
申请号：US14914355
申请日：2014-10-22
申请人： Hitachi, Ltd.
发明人： Yushi Tsubota , Fumito Watanabe , Yasutaka Konno , Shinichi Kojima , Keisuke Yamakawa , Shinji Kurokawa
IPC分类号： A61B6/00 , A61B6/03 , G01N23/087 , G01N23/046
摘要： A change of X-ray radiation quality due to a material existing between an X-ray source and a detection element is estimated and corrected. Accordingly, deterioration of material discrimination ability in a dual energy imaging method can be prevented. An X-ray imaging apparatus is provided with an inherent filtration calculator configured to use measured data obtained by imaging air at two or more types of different tube voltages to calculate a deviation from a reference radiation quality, as a transmission length (inherent filtration) of a predetermined reference material. A reference-material transmission-length conversion is applied to the measured data according to the dual energy imaging method, thereby calculating the reference material transmission length (inherent filtration). When a subject is imaged, the dual energy imaging is performed by adding the inherent filtration calculated as to each detection element, and this produces an image with the change of radiation quality having been corrected.

2. 发明授权

US10905388B2 Photon-counting CT device, and CT imaging method using photon counting 有权
公开(公告)号：US10905388B2
公开(公告)日：2021-02-02
申请号：US16305777
申请日：2017-09-08
申请人： HITACHI, LTD.
发明人： Shinichi Kojima , Fumito Watanabe , Yasutaka Konno , Isao Takahashi , Kazuma Yokoi
IPC分类号： A61B6/00 , A61B6/02 , A61B6/03
摘要： X-ray photons are counted as to each of energy bands (bins) to which optimum energy ranges are provided, and an image with reduced noise is displayed in a short time. An energy range of at least one of multiple energy bands in an X-ray detector is adjusted, on the basis of a distribution of degrees of X-ray attenuation at respective energy levels, the distribution of degrees of X-ray attenuation being measured in advance with respect to a predetermined direction of a subject. By using the X-ray detector with the energy bands after the adjustment, photon-counting CT imaging is performed.

3. 发明授权

US10542947B2 Photon-counting CT apparatus 有权
公开(公告)号：US10542947B2
公开(公告)日：2020-01-28
申请号：US16071810
申请日：2016-11-17
申请人： Hitachi, Ltd.
发明人： Shinichi Kojima , Yasutaka Konno , Fumito Watanabe , Isao Takahashi
IPC分类号： A61B6/00 , A61B6/03 , G06T11/00
摘要： The present invention is directed to make a photon-counting CT apparatus capable of more accurate data acquisition. Such apparatus is provided with a reference detection unit and a time measuring instrument to measure temporal fluctuations in a rotational direction of an X-ray irradiation unit. The apparatus corrects temporal fluctuations in the rotational direction involved in data measured by the reference detection unit, using time measurement data which is output by the time measuring instrument. Using corrected measurement data measured by the reference detection unit, the apparatus makes corrections of fluctuations pertaining to the X-ray tube of the X-ray irradiation unit and pile-up. Data corrections with high accuracy are thus enabled.

4. 发明授权

US10302779B2 Radiation detector, radiation imaging device, computer tomography device, and radiation detection method 有权
公开(公告)号：US10302779B2
公开(公告)日：2019-05-28
申请号：US15518575
申请日：2015-06-18
申请人： HITACHI, LTD.
发明人： Isao Takahashi , Kazuma Yokoi , Eiji Moro , Yuichiro Ueno , Yasutaka Konno , Fumito Watanabe , Shinichi Kojima
IPC分类号： G01T1/29 , H01L31/115 , G01T1/161 , G01T1/17 , G01T1/20 , H01L27/146 , A61B6/03 , A61B6/00
摘要： A flat pixel (20) is a single unit composing a radiation detector and is configured so as to be divided into at least four subpixels (21) such that even if a prescribed number of subpixels (21) are removed from each pixel (20) in order of largest effective area, the centroid (51) of the effective area of the entirety of the remaining subpixels (21) is positioned within a similar-shape region (30) having the same centroid (50) as the pixel (20) and having sides of lengths that are half those of the pixel (20).

5. 发明授权

US10368824B2 X-ray CT device and processing device 有权
公开(公告)号：US10368824B2
公开(公告)日：2019-08-06
申请号：US15123192
申请日：2015-02-04
申请人： HITACHI, LTD.
发明人： Keisuke Yamakawa , Shinichi Kojima
IPC分类号： A61B6/00 , A61B6/03 , G06T11/00
摘要： This X-ray CT device uses iterative reconstruction to obtain a CT image with the desired noise reduction or X-ray reduction ratio. An iterative approximation reconstruction unit (136) is provided which, from measured projection data obtained by an X-ray detection unit of the X-ray CT device, iteratively reconstructs a CT image in a reconstruction range of a subject, and iteratively corrects the CT image such that calculated projection data, calculated through forward projection of a CT image, is the same as the difference between measured projection data detected by the X-raw detection unit and calculated projection data. The iterative approximation reconstruction unit is provided with a parameter determination unit (151), an iterative correction unit (152), and a table unit (153) which calculates in advance the relation between each parameter used in the iterative reconstruction, and noise reduction or X-ray reduction ratio in the CT image. The parameter determination unit (151) determines the parameters from a calculation table in the table unit (153) depending on the desired reduction ratio.

6. 发明授权

US10219763B2 Photon counting CT device and estimated exposure level computation method 有权
公开(公告)号：US10219763B2
公开(公告)日：2019-03-05
申请号：US15504827
申请日：2015-08-06
申请人： Hitachi, Ltd.
发明人： Shinichi Kojima , Keisuke Yamakawa
IPC分类号： A61B6/00 , A61B6/03
摘要： Provided is a photon counting CT device for estimating an exposure dose to a subject, precisely in a simple configuration, irrespective of a spectrum shape of X-rays being applied. An exposure dose derived from the X-rays with predetermined intensity is obtained in every energy range provided in advance, and held as exposure per band data. When an imaging condition is provided, X-rays are applied in accordance with the imaging condition thus provided, and a photon count (intensity) of the incident X-rays as to each energy range is obtained, in the shape of spectrum of the X-rays applied to a detector without placing the subject. The intensity of the incident X-rays is multiplied by the exposure per band, and the results as to all the energy ranges are added up. Accordingly, the exposure dose caused by the X-rays being applied in accordance with the provided imaging condition is estimated.

7. 发明授权

US10210633B2 X-ray CT device and sequential correction parameter determination method 有权
公开(公告)号：US10210633B2
公开(公告)日：2019-02-19
申请号：US15580488
申请日：2016-06-06
申请人： Hitachi, Ltd.
发明人： Keisuke Yamakawa , Shinichi Kojima
IPC分类号： G06K9/00 , G06T11/00 , A61B6/03 , A61B6/00 , G06T5/00
摘要： High-quality image and low radiation exposure are achieved without increasing man-hours and data amount to be held. A table of iterative correction parameters optimized in the representative imaging conditions is held and an iterative correction parameter optimized in the actual imaging conditions is determined from the iterative correction parameters held in the table. In addition to the parameter table, a reference weight is also held and is reflected to generate the iterative correction parameter for each pixel position.

8. 发明授权

US11944468B2 Material decomposition apparatus, PCCT apparatus, and material decomposition method 有权
公开(公告)号：US11944468B2
公开(公告)日：2024-04-02
申请号：US16876185
申请日：2020-05-18
申请人： Hitachi, Ltd.
发明人： Shinichi Kojima , Kazuma Yokoi , Isao Takahashi , Fumito Watanabe , Fuyuhiko Teramoto , Taiga Gotou
IPC分类号： A61B6/03 , A61B6/00 , A61B6/42
CPC分类号： A61B6/032 , A61B6/4241 , A61B6/5217 , A61B6/545
摘要： A material decomposition apparatus for performing decomposition of a material in an object. The apparatus includes a data storage section for storing correction data preliminarily generated by decomposing one of three or more materials into the other two materials, a data input section to which radiation data of the object is inputted, the radiation data being divided into a plurality of energy levels, and a decomposition processing section for repeatedly performing two-material decomposition for decomposition of the other two materials of the three or more materials using the radiation data at different energy levels and the correction data to perform decomposition of the inside of the object into the three or more materials.

9. 发明授权

US09977137B2 X-ray image pickup device and image reconstruction method 有权
公开(公告)号：US09977137B2
公开(公告)日：2018-05-22
申请号：US15325497
申请日：2015-07-23
申请人： HITACHI, LTD.
发明人： Yushi Tsubota , Shinji Kurokawa , Keisuke Yamakawa , Yasutaka Konno , Shinichi Kojima , Fumito Watanabe
IPC分类号： G06K9/00 , G01T1/29 , A61B6/03 , G01N23/04 , A61B6/00
CPC分类号： G01T1/2985 , A61B6/032 , A61B6/4233 , G01N23/046
摘要： Provided is a technique in an X-ray imaging apparatus for implementing data interpolation approximating an ideal point response trajectory interpolation, along with reducing calculation load. A method is provided to perform interpolation at high speed, in a direction along the point response trajectory. Sinograms are interpolated in advance from measured data, as to representative angles (e.g., 0°, ±30°, ±60°, and 90°) only. When a pixel targeted for back projection is determined at the time of reconstruction, a slope of the point response trajectory is determined as to each view. According to the slope of the trajectory, each representative sinogram is added with weight, whereby interpolation data in association with any angle can be obtained.

10. 发明授权

US09943281B2 X-ray CT apparatus 有权
公开(公告)号：US09943281B2
公开(公告)日：2018-04-17
申请号：US14898280
申请日：2014-07-23
申请人： Hitachi, Ltd.
发明人： Keisuke Yamakawa , Shinichi Kojima , Yushi Tsubota
IPC分类号： A61B6/00 , A61B6/03
CPC分类号： A61B6/5258 , A61B6/032 , A61B6/4078 , A61B6/5205
摘要： Noise of a CT image is reduced with good accuracy by using noise information obtained from the CT image. An X-ray CT apparatus comprises a successive approximate reconstruction part that reconstructs a CT image for a reconstruction area of an imaging object from measured projection data obtained by an X-ray detection part of the X-ray CT apparatus, and successively corrects the CT image so that calculated projection data obtained by forward projection of the CT image performed by calculation and the measured projection data detected by the X-ray detection part become equal to each other. The successive approximate reconstruction part comprises a noise measurement part that calculates noise intensity in the CT image at least for a predetermined region of interest, and successively corrects the CT image of the region of interest by using the calculated noise intensity.

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