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公开(公告)号：US11686691B2
公开(公告)日：2023-06-27
申请号：US17331974
申请日：2021-05-27
Applicant: CANON KABUSHIKI KAISHA
Inventor： Atsushi Iwashita , Kosuke Terui , Katsuro Takenaka , Yoshiaki Ishii
CPC classification number: G01N23/04 , A61B6/4035 , A61B6/4233 , A61B6/4291 , A61B6/4441 , A61B6/481 , A61B6/482 , A61B6/5264 , A61B6/542 , H04N5/32 , H04N5/3205
Abstract: A radiation imaging apparatus that obtains a radiation image by an energy subtraction method. Each pixel includes a conversion element that converts radiation into an electrical signal and a reset portion that resets the conversion element. Each pixel performs an operation of outputting a first signal corresponding to an electrical signal generated by the conversion element in a first period, and an operation of outputting a second signal corresponding to an electrical signal generated by the conversion element in the first period and a second period. Radiation having first energy is emitted in the first period, and radiation having second energy is emitted in the second period. In each pixel, the reset portion does not reset the conversion element during a period that includes the first period and the second period.
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公开(公告)号：US11644582B2
公开(公告)日：2023-05-09
申请号：US17084199
申请日：2020-10-29
Applicant: CANON KABUSHIKI KAISHA
Inventor： Takamasa Ishii , Kosuke Terui , Kota Nishibe , Tomohiro Hoshina
CPC classification number: G01T1/20185 , A61B6/4208 , A61B6/4216 , A61B6/4233 , A61B6/4266 , A61B6/52 , A61B6/5205 , A61B6/56 , A61B6/563 , A61B6/566 , G01T1/2002 , G01T1/2006 , G01T1/2008 , G01T1/2018 , G01T1/20181 , G01T1/20182 , G01T1/20186 , G01T1/20187 , G01T1/20188 , A61B6/40
Abstract: A radiation imaging apparatus including: a first scintillator layer configured to convert a radiation (R) which has entered the first scintillator layer into light; a second scintillator layer configured to convert a radiation transmitted through the first scintillator layer into light; a fiber optic plate (FOP) provided between the first scintillator layer and the second scintillator layer; and an imaging portion configured to convert the light generated in the first scintillator layer and the light generated in the second scintillator layer into an electric signal.
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公开(公告)号：US20220120919A1
公开(公告)日：2022-04-21
申请号：US17646423
申请日：2021-12-29
Applicant: CANON KABUSHIKI KAISHA
Inventor： Kosuke Terui
Abstract: A radiation imaging apparatus includes an imaging unit having a plurality of pixels. Each of the plurality of pixels includes a conversion element configured to convert radiation into an electrical signal, a processing circuit configured to process the electrical signal output from the conversion element, and a holding unit configured to sample and hold the electrical signal output from the processing circuit. After radiation irradiation from a radiation source is started and before next radiation irradiation from the radiation source is started, the holding unit samples and holds, at a first timing and a second timing which is after the first timing, the electrical signal output from the processing circuit. A gain of the processing circuit at the first timing and the gain of the processing circuit at the second timing are different from each other.
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公开(公告)号：US11047994B2
公开(公告)日：2021-06-29
申请号：US16731143
申请日：2019-12-31
Applicant: CANON KABUSHIKI KAISHA
Inventor： Kosuke Terui , Atsushi Iwashita , Akira Tsukuda , Sota Torii
IPC: H01L27/146 , G01T1/17 , G01T1/29
Abstract: Radiation imaging apparatus includes pixel array having pixels, readout circuit for reading signals from the pixel array, and detector for detecting, based on radiation emitted from radiation source or information provided from the radiation source, start of radiation irradiation by the radiation source, and controller for determining timing of each of operations of sample and hold in each of the pixels each time the start of radiation irradiation is detected by the detector. The timing of at least one operation of the operations is timing in radiation irradiation period, and each of the pixels includes convertor for converting radiation into electrical signal, and sample and hold circuit for sample-holding the signal from the conversion element over plural times in accordance with the timing of each of the operations determined by the controller.
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公开(公告)号：US20200155097A1
公开(公告)日：2020-05-21
申请号：US16749201
申请日：2020-01-22
Applicant: CANON KABUSHIKI KAISHA
Inventor： Sota Torii , Atsushi Iwashita , Kosuke Terui , Akira Tsukuda
Abstract: A radiation imaging apparatus is provided. The apparatus comprises a detection unit configured to generate an image signal according to radiation emitted by a radiation source, an image processing unit, and a control unit. The control unit performs first imaging and second imaging performed after the first imaging using radiations of different energies, the image processing unit generates an energy subtraction image using a first image signal generated by the detection unit in the first imaging and a second image signal generated by the detection unit in the second imaging, and the second imaging is performed under a radiation irradiation condition according to a noise amount included in the first image signal.
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Patent Agency Ranking
公开(公告)号：US10197684B2
公开(公告)日：2019-02-05
申请号：US15564946
申请日：2016-06-17
Applicant: CANON KABUSHIKI KAISHA
Inventor： Kosuke Terui , Shinichi Takeda , Katsuro Takenaka , Sho Sato , Atsushi Iwashita , Yoshiaki Ishii
Abstract: A radiation imaging apparatus is provided. The apparatus comprises a scintillator configured to convert radiation into light, a sensor panel in which a plurality of pixels each comprising a light detector configured to detect the light is arranged in a two-dimensional array, and a processing unit. The processing unit comprises a signal generating unit configured to output signals indicating intensities of the light detected by the light detector of each of the plurality of pixels, and a detection unit configured to identify a group of pixels each of which outputs a signal of a level exceeding a reference value out of the signals and detect, based on a pattern of the group, pileup in which a plurality of radiation photons is detected as a single radiation photon.
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公开(公告)号：US20180136343A1
公开(公告)日：2018-05-17
申请号：US15564946
申请日：2016-06-17
Applicant: CANON KABUSHIKI KAISHA
Inventor： Kosuke Terui , Shinichi Takeda , Katsuro Takenaka , Sho Sato , Atsushi Iwashita , Yoshiaki Ishii
CPC classification number: G01T1/2018 , A61B6/4225 , A61B6/4233 , A61B6/4241 , H04N5/32 , H04N5/363 , H04N5/374 , H04N5/378
Abstract: A radiation imaging apparatus is provided. The apparatus comprises a scintillator configured convert radiation into light, a sensor panel in which a plurality of pixels each comprising a light detector configured to detect the light is arranged in a two-dimensional array, and a processing unit. The processing unit comprises a signal generating unit configured to output signals indicating intensities of the light detected by the light detector of each of the plurality of pixels, and a detection unit configured to identify a group of pixels each of which outputs a signal of a level exceeding a reference value out of the signals and detect, based on a pattern of the group, pileup in which a plurality of radiation photons is detected as a single radiation photon.
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公开(公告)号：US20160270755A1
公开(公告)日：2016-09-22
申请号：US15064757
申请日：2016-03-09
Applicant: CANON KABUSHIKI KAISHA
Inventor： Katsuro Takenaka , Shinichi Takeda , Atsushi Iwashita , Sho Sato , Kosuke Terui , Yoshiaki Ishii
CPC classification number: G01T1/20 , A61B6/4233 , A61B6/487 , H04N5/32 , H04N5/3658 , H04N5/378
Abstract: A radiation imaging apparatus is provided. The apparatus comprises a plurality of pixels and a signal processing unit configured to read out an analog signal from each pixel and output an image signal. The signal processing unit comprises a conversion unit configured to convert the analog signal into a digital signal using an A/D converter such that the digital signals of a first group pixels include a first offset components and the digital signals of a second group pixels include a second offset components, and a digital signal processing unit. The digital signal processing unit calculates a correction value using the digital signals of the first and the second group pixels, and performs correction of reducing an influence caused by the A/D converter in the digital signals of the first group pixels using the correction value, thereby generating the image signal.
Abstract translation: 提供了一种放射线成像装置。 该装置包括多个像素，以及信号处理单元，被配置为从每个像素读出模拟信号并输出图像信号。 信号处理单元包括转换单元，其被配置为使用A / D转换器将模拟信号转换为数字信号，使得第一组像素的数字信号包括第一偏移分量，并且第二组像素的数字信号包括 第二偏移分量，以及数字信号处理单元。 数字信号处理单元使用第一组像素和第二组像素的数字信号来计算校正值，并且使用校正值进行减少由A / D转换器对第一组像素的数字信号的影响的校正， 从而产生图像信号。
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公开(公告)号：US20160084969A1
公开(公告)日：2016-03-24
申请号：US14849735
申请日：2015-09-10
Applicant: CANON KABUSHIKI KAISHA
Inventor： Eriko Sato , Toshio Kameshima , Tomoyuki Yagi , Katsuro Takenaka , Atsushi Iwashita , Hideyuki Okada , Takuya Ryu , Kosuke Terui
IPC: G01T1/24
CPC classification number: G01T1/247 , G01T1/241 , H04N5/32 , H04N5/3205 , H04N5/361
Abstract: A radiation imaging apparatus includes a pixel array where a plurality of pixels configured to detect radiation are arrayed, a sensor configured to detect radiation irradiation for exposure control, a reader configured to read out signals from the plurality of pixels and the sensor, and a processor configured to process the signals read out by the reader. The processor corrects, based on the signals read out from the sensor by the reader, the signals read out from the plurality of pixels by the reader.
Abstract translation: 一种放射线成像装置，包括排列有被配置为检测辐射的多个像素的像素阵列，被配置为检测用于曝光控制的放射线照射的传感器，被配置为从多个像素读出信号的读取器和传感器，以及处理器 配置为处理由读取器读出的信号。 处理器基于读取器从传感器读出的信号校正由读取器从多个像素读出的信号。
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公开(公告)号：US20160021290A1
公开(公告)日：2016-01-21
申请号：US14801549
申请日：2015-07-16
Applicant: CANON KABUSHIKI KAISHA
Inventor： Tomoyuki Yagi , Toshio Kameshima , Katsuro Takenaka , Atsushi Iwashita , Eriko Sato , Hideyuki Okada , Takuya Ryu , Kosuke Terui
Abstract: A radiation image capturing apparatus, comprising a sensor configured to monitor an irradiating dose of radiation, a switch configured output a sensor signal from the sensor, a readout unit configured to read out the sensor signal via a signal line, and a controlling unit, wherein the controlling unit performs first control of repeatedly performing, while the sensor is irradiated, a series of operations including a first operation of setting the switch to a conductive state and a second operation of setting the switch to a non-conductive state, second control of reading out the sensor signal in the first operation as a first signal and a potential of the signal line in the second operation as a second signal, and third control of calculating the irradiating dose of radiation based on the first signal and the second signal.
Abstract translation: 一种放射线图像捕获装置，包括被配置为监测辐射照射剂量的传感器，配置为从传感器输出传感器信号的开关，经配置以经由信号线读出传感器信号的读出单元和控制单元，其中 控制单元执行在传感器被照射时重复执行包括将开关设置为导通状态的第一操作和将开关设置为非导通状态的第二操作的一系列操作的第一控制，第二控制 在第一操作中将传感器信号作为第一信号和第二操作中的信号线的电位读出为第二信号，以及基于第一信号和第二信号计算辐射照射剂量的第三控制。
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