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公开(公告)号：US10743834B2
公开(公告)日：2020-08-18
申请号：US15723824
申请日：2017-10-03
发明人： Tooru Kato , Hiroaki Nakai
摘要： An X-ray image diagnostic apparatus according to an embodiment includes a photon counting X-ray detector, calibration circuitry, and image generating circuitry. The photon counting X-ray detector includes a plurality of detection elements each of which is configured to detect X-rays and output a detection signal. The calibration circuitry calibrates a detection signal of each of the detection elements using a correction value calculated from a plurality of signals output from the detection elements and corresponding to a plurality of X-ray application conditions relating to continuous X-rays. The image generating circuitry generates an image using the calibrated detection signals of the detection elements.
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公开(公告)号：US10149655B2
公开(公告)日：2018-12-11
申请号：US15353339
申请日：2016-11-16
发明人： Tooru Kato , Mikihito Hayashi , Hiroaki Nakai
摘要： According to one embodiment, a photon counting imaging apparatus includes an X-ray tube, an X-ray detector, and data acquisition circuitry. The X-ray detector includes a detector pixel including photoelectric conversion cells each configured to individually generate an electrical signal of a predetermined pulse height, and output circuitry configured to generate an energy signal having a pulse height corresponding to energy of the X-rays based on the electrical signals from the photoelectric conversion cells. The data acquisition circuitry corrects the energy signal based on a relationship between an amplification factor and an applied voltage to the detector pixel during a period until the voltage applied to the detector pixel recovers from a breakdown voltage to a reverse bias voltage.
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3.发明授权公开(公告)号：US10074197B2
公开(公告)日：2018-09-11
申请号：US14842111
申请日：2015-09-01
发明人： Shuhei Nitta , Taichiro Shiodera , Tomoyuki Takeguchi , Hidenori Takeshima , Toshiyuki Ono , Takashi Ida , Hiroaki Nakai
IPC分类号： A61B6/03 , G06T11/00 , G01N23/046 , A61B6/00 , G01N23/087
CPC分类号： G06T11/005 , A61B6/032 , A61B6/4241 , A61B6/481 , A61B6/482 , A61B6/5205 , G01N23/046 , G01N23/087 , G06T2211/408
摘要： An X-ray computed-tomography (CT) apparatus of an embodiment includes an X-ray tube, an X-ray detector, and processing circuitry. The X-ray tube is configured to generate an X-ray. The X-ray detector includes a plurality of X-ray detection elements configured to output a signal based on the X-ray entered therein. The processing circuitry is configured to derive a constraint condition by using at least one piece of projection data out of a plurality of pieces of projection data corresponding energy bins of which differ at least partially, calculate an effective length that is a total length for which the X-ray has passed through a region in which a material to be decomposed is present, and generate image data showing information about the material by using the projection data and the effective length.
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公开(公告)号：US09913622B2
公开(公告)日：2018-03-13
申请号：US15045968
申请日：2016-02-17
发明人： Takashi Ida , Toshiyuki Ono , Shuhei Nitta , Hiroaki Nakai
CPC分类号： A61B6/5205 , A61B6/032 , A61B6/405 , A61B6/4241 , A61B6/482 , G06T11/003 , G06T11/006 , G06T2211/408
摘要： According to an embodiment, an X-ray computed tomography (CT) apparatus includes processing circuitry. The processing circuitry is configured to acquire projection data that is based on a spectrum representing an amount of X-rays with respect to energy of a radiation having passed through a subject; select a plurality of materials; generate, from the projection data, first density images for each of the selected materials; generate a monochromatic image of specific energy from the first density images; reconstruct the projection data corresponding to the specific energy to generate a reconstructed image; compare the monochromatic image and the reconstructed image; and provide a notification indicating a result of the comparison.
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5.发明申请公开(公告)号：US20130216018A1
公开(公告)日：2013-08-22
申请号：US13855327
申请日：2013-04-02
发明人： Hiroaki Nakai , Tooru Kato , Kanta Kobuchi
CPC分类号： A61B6/032 , A61B6/4078 , A61B6/4233 , G06F19/00 , G06T7/0012 , G16H40/63
摘要： According to one embodiment, an X-ray CT apparatus includes a data acquiring unit, a data processing unit and a data transmitting unit. The data acquiring unit is configured to expose an X-ray to an object, acquire detection data of the X-ray having transmitted the object and compress the detection data to generate compressed data. The data processing unit is configured to generate X-ray CT image data of the object based on the compressed data transmitted from the data acquiring unit through a transmission line. The data transmitting unit is configured to transmit uncompressed detection data of an X-ray to the data processing unit through the transmission line according to information from an input device.
摘要翻译： 根据一个实施例，X射线CT装置包括数据获取单元，数据处理单元和数据发送单元。 数据获取单元被配置为将X射线暴露于对象，获取已发送对象的X射线的检测数据，并压缩检测数据以生成压缩数据。 数据处理单元被配置为基于从数据获取单元通过传输线发送的压缩数据生成对象的X射线CT图像数据。 数据发送单元被配置为根据来自输入设备的信息通过传输线路将未压缩的X射线检测数据发送到数据处理单元。
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公开(公告)号：US10219775B2
公开(公告)日：2019-03-05
申请号：US15336222
申请日：2016-10-27
发明人： Hiroaki Nakai , Mikihito Hayashi , Tooru Kato
摘要： A photon-counting X-ray computed tomography (CT) apparatus according to an embodiment includes an X-ray tube, a detector, a photon counting circuitry, a correcting circuitry, and a calculating circuitry. The X-ray tube irradiates a subject with X-rays. The detector includes a plurality of detection elements that detect photons of X-rays incident on the detection elements. The photon counting circuitry counts the count of X-ray photons for each energy bin set in an X-ray energy distribution, for each position of the X-ray tube, and for each of the detection elements. The correcting circuitry corrects the count of the X-ray photons counted by the photon counting circuitry, based on a detection characteristic, of the detection elements. The calculating circuitry calculates the reliability of a pixel in a reconstruction image, based on the correction.
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公开(公告)号：US10206638B2
公开(公告)日：2019-02-19
申请号：US14966164
申请日：2015-12-11
发明人： Hiroaki Nakai
摘要： An X-ray CT apparatus according to an embodiment includes a detector, counted result collecting circuitry, count rate calculating circuitry, control circuitry, and image reconstruction circuitry. The detector includes a plurality of detection elements including a plurality of types of detection elements with different response characteristics to an X-ray dose, and outputs a detection signal according to an incidence of an X-ray photon to each of the detection elements. The counted result collecting circuitry collects counted results obtained by counting X-ray photons from detection signals output by the detection elements. The count rate calculating circuitry calculates a count rate from the detection signals output by the detection elements. The control circuitry selects a detection element based on the count rate and respective response characteristics of the detection elements. The image reconstruction circuitry reconstructs X-ray CT image data using the counted result obtained from the detection element selected by the control circuitry.
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公开(公告)号：US20180211418A1
公开(公告)日：2018-07-26
申请号：US15935158
申请日：2018-03-26
发明人： Takashi IDA , Toshiyuki Ono , Shuhei Nitta , Taichiro Shiodera , Hidenori Takeshima , Tomoyuki Takeguchi , Hiroaki Nakai
CPC分类号： G06T11/005 , A61B6/032 , A61B6/481 , A61B6/482 , A61B6/5258
摘要： According to an embodiment, a device includes first and second generators, a detector, and a corrector. The first generator is configured to generate a first image based on data corresponding to photons with a first energy from among data that is obtained based on an energy of radiation that has passed through a subject. The second generator is configured to generate a second image based on data corresponding to photons with a second energy. The detector is configured to detect, in the second image, a second block having a similar pattern of pixel values to a first block included in the second image. The corrector is configured to correct pixel values of a third block in the first image corresponding to the first block based on new pixel values of the third block that are calculated by using pixel values included in a fourth block in the first image.
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9.发明授权公开(公告)号：US09808210B2
公开(公告)日：2017-11-07
申请号：US14243393
申请日：2014-04-02
CPC分类号： A61B6/032 , A61B6/4241 , A61B6/482 , A61B6/5205 , G01N23/046
摘要： A photon counting type X-ray computed tomography apparatus includes an X-ray tube, a detector, a raw data generating section, an information compression section, and a data transmission section. The X-ray tube is configured to irradiate an X-ray. The detector is configured to count photons derived from the irradiated X-ray. The raw data generating section is configured to collect results of counting performed by the detector and to generate, from the results of counting, raw data for each of a plurality of energy bands. The information compression section is configured to compare values of the raw data between the raw data generated respectively for the energy bands, and to perform information compression of each of the raw data. The data transmission section is configured to transmit the raw data compressed by the information compression.
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公开(公告)号：US10338012B2
公开(公告)日：2019-07-02
申请号：US15446325
申请日：2017-03-01
发明人： Tooru Kato , Hiroaki Nakai , Mikihito Hayashi
IPC分类号： G01T1/17 , G01N23/046
摘要： A photon counting detector of an embodiment includes X-ray detection elements, a capacitor, and generating circuitry. The X-ray detection elements detect an X-ray and generate an electrical signal. The capacitor is provided for each of the X-ray detection element, and accumulates an electrical signal generated in each of the X-ray detection element. The generating circuitry has low sensitivity to radiation, and generates a digital signal by using an accumulation result of the electrical signal in the capacitors, and reference information that is stored in advance.
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