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1. 发明申请

US20170105688A1 X-RAY SCANNING APPARATUS 审中-公开
公开(公告)号：US20170105688A1
公开(公告)日：2017-04-20
申请号：US15122981
申请日：2015-03-17
申请人： HITACHI, LTD.
发明人： Yasutaka KONNO
IPC分类号： A61B6/00 , A61B6/03
CPC分类号： A61B6/4241 , A61B6/032 , A61B6/482 , A61B6/5205 , A61B6/585 , G01T1/2985
摘要： In an X-ray scanning apparatus mounted with a photon counting type radiation detector, a data processing device of the X-ray scanning apparatus includes a correction unit that corrects a digital output value in each of the plurality of energy ranges with respect to each X-ray detection element in order to obtain an accurate projection image by correcting a counting error of the number of X-ray photons in each energy range. The correction unit includes an inflow amount calculation portion that calculates a digital amount corresponding to X-ray photons which flow from a certain X-ray detection element to another X-ray detection element, and an energy shift inflow amount/out flow amount calculation portion that calculates a digital amount corresponding to X-ray photons which flow into a high energy range due to energy shift in a single X-ray detection element, and performs correction by using the digital amounts calculated by the calculation portions.

2. 发明申请

US20200323502A1 PHOTON-COUNTING CT DEVICE, AND CT IMAGING METHOD USING PHOTON COUNTING 审中-公开
公开(公告)号：US20200323502A1
公开(公告)日：2020-10-15
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 , A61B6/03 , A61B6/02
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. 发明申请

US20190029628A1 X-RAY DETECTOR, X-RAY CT DEVICE, X-RAY DETECTION METHOD, AND X-RAY DETECTION PROGRAM 审中-公开
公开(公告)号：US20190029628A1
公开(公告)日：2019-01-31
申请号：US16077552
申请日：2017-02-03
申请人： Hitachi, Ltd.
发明人： Yasutaka KONNO
IPC分类号： A61B6/00 , H04N5/32 , A61B6/03
摘要： There is disclosed an X-ray detector that includes a detection section, an addition rate determination section, an addition section, and a position information storage section in order to enhance the accuracy of interpolation of an output signal from a defective element and suppress artifacts with ease without increasing, for example, the length of processing time, the number of processing circuits, and the amount of interpolation data. The detection section includes a plurality of arrays of detection element groups that are each formed of a plurality of detection elements in correspondence with one pixel. The addition rate determination section determines addition rates for output signals of the detection elements. The addition section calculates the signal value of each pixel of a projection image by adding the output signals of the detection elements belonging to the detection element groups in accordance with the addition rates. The position information storage section stores pixel position information and defective element position information. The pixel position information indicates the positional relationship between the pixel and the detection elements. The defective element position information indicates the position of a defective element. Based on the pixel position information and the defective element position information, the addition rate determination section determines the addition rate for the output signal of the defective element and the addition rate for the output signal of a diagonal detection element positioned symmetrically with respect to the defective element in such a manner that the addition rates are equal and lower than the addition rates for the other detection elements and that the addition rates for the other detection elements are substantially equal.

4. 发明申请

US20170231584A1 X-RAY IMAGING APPARATUS 审中-公开
公开(公告)号：US20170231584A1
公开(公告)日：2017-08-17
申请号：US15502991
申请日：2015-08-25
申请人： HITACHI, LTD.
发明人： Yasutaka KONNO
IPC分类号： A61B6/00 , A61B6/03
CPC分类号： A61B6/4241 , A61B6/032 , A61B6/5205 , A61B6/585 , G01N23/046 , G01T1/171
摘要： In an X-ray scanning apparatus including a photon counting type X-ray detection element, in order to perform counted number correction specialized for pile-up with high accuracy, the X-ray scanning apparatus includes an X-ray detector in which a plurality of photon counting type X-ray detection elements are disposed, each of the X-ray detection elements detecting an incident X-ray photon, classifying energy of the X-ray photon into two or more energy ranges, and counting the X-ray photon, and a correction unit that corrects the counted number in the X-ray detection element, in which the correction unit includes a counting error amount determination part that determines a counting error amount in a counted number due to pile-up according to a pile-up occurrence probability in two or more X-ray photons

5. 发明申请

US20210128096A1 IMAGE PROCESSING DEVICE, X-RAY CT DEVICE, AND IMAGE PROCESSING METHOD 有权
公开(公告)号：US20210128096A1
公开(公告)日：2021-05-06
申请号：US16472523
申请日：2017-12-04
申请人： Hitachi, Ltd.
发明人： Yasutaka KONNO
IPC分类号： A61B6/00 , A61B6/03
摘要： This is directed to calculating physical amounts of a plurality of types of basis materials without having to increase a calculation time.
An image processing device is provided which includes a first basis material transformation unit that calculates each of physical amounts of two or more basis materials included in a first basis material group based on two or more types of projection data different in energy distribution, an image generation unit that generates a plurality of images, each of which is at least one of a projection image and a reconstructed image of an object, from physical amounts of two or more basis materials included in the first basis material group, and a second basis material transformation unit that calculates a physical amount of a basis material included in a second basis material group which is different from the first basis material group based on the plurality of images.

6. 发明申请

US20190021685A1 Photon-Counting CT Apparatus 审中-公开
公开(公告)号：US20190021685A1
公开(公告)日：2019-01-24
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.

7. 发明申请

US20170176609A1 X-RAY IMAGE PICKUP DEVICE AND IMAGE RECONSTRUCTION METHOD 有权
公开(公告)号：US20170176609A1
公开(公告)日：2017-06-22
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： G01T1/29 , G01N23/04 , A61B6/00 , A61B6/03
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.

8. 发明申请

US20180263576A1 X-RAY CT DATA PROCESSING DEVICE AND X-RAY CT DEVICE COMPRISING SAME 审中-公开
公开(公告)号：US20180263576A1
公开(公告)日：2018-09-20
申请号：US15763126
申请日：2016-10-18
申请人： Hitachi, Ltd.
发明人： Yasutaka KONNO
IPC分类号： A61B6/03 , G06T11/00 , A61B6/00
CPC分类号： A61B6/032 , A61B6/4241 , A61B6/463 , A61B6/482 , A61B6/5205 , A61B6/5217 , G06T11/003 , G06T11/005 , G06T2207/10081 , G06T2211/408
摘要： An X-ray CT data processing device is provided which when multi-energy photography is performed with an energy-separation type detector, and a subject is separated into a plurality of standard materials to create an image, estimates the appropriateness of posited standard materials, and in order to determine appropriate standard materials with satisfactory accuracy, processes CT data respectively acquired in a plurality of detection energy ranges to create a reconstructed image separated into predetermined standard materials. The X-ray CT data processing device is equipped with a standard material data calculating part which calculates energy-independent physical quantities for a plurality of standard materials respectively using different combinations of a plurality of the CT data, and creates a plurality of standard material data for the same standard material, and an appropriateness determination index creating part which creates an index for determining the appropriateness of the standard material, based on the plurality of standard material data calculated by the standard material data calculating part.

9. 发明申请

US20170276808A1 RADIATION DETECTOR, RADIATION IMAGING DEVICE, COMPUTER TOMOGRAPHY DEVICE, AND RADIATION DETECTION METHOD 审中-公开
公开(公告)号：US20170276808A1
公开(公告)日：2017-09-28
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 , H01L27/146 , G01T1/161 , G01T1/20
CPC分类号： G01T1/2985 , A61B6/032 , A61B6/4208 , G01T1/161 , G01T1/17 , G01T1/2018 , H01L27/14658 , H01L31/115
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).

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