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公开(公告)号：US11831994B2
公开(公告)日：2023-11-28
申请号：US17660309
申请日：2022-04-22
Applicant: CANON KABUSHIKI KAISHA
Inventor： Minoru Watanabe
Abstract: A radiation detection apparatus includes an obtaining unit configured to obtain information representing a setting of a target region that is a target of automatic exposure control, and information representing a radiation transmission characteristic of an object corresponding to the target region, a setting unit configured to set a candidate region based on the target region, a monitoring unit configured to monitor a radiation dose during incidence in the candidate region, a specifying unit configured to specify, as a detection region, a region where the monitored radiation dose falls within a range determined in accordance with the radiation transmission characteristic, and an output unit configured to output the radiation dose monitored in the detection region.
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公开(公告)号：US11045160B2
公开(公告)日：2021-06-29
申请号：US16571642
申请日：2019-09-16
Applicant: CANON KABUSHIKI KAISHA
Inventor： Minoru Watanabe , Kentaro Fujiyoshi , Sho Sato
Abstract: A radiation imaging apparatus is provided. The apparatus comprises: an imaging region in which a plurality of conversion elements are arranged, wherein the plurality of conversion elements includes a first conversion element configured to obtain a radiation image and a second conversion element configured to obtain irradiation information of incident radiation during radiation irradiation; a storage unit configured to store correction data for correcting a signal output from the first conversion element; and a control unit. The control unit determines a period to cause the first conversion element to perform an accumulation operation in accordance with the irradiation information, determines a correction amount corresponding to the period based on the correction data, and generates a radiation image signal by correcting a signal output from the first conversion element in accordance with the correction amount after the radiation irradiation.
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公开(公告)号：US20210141105A1
公开(公告)日：2021-05-13
申请号：US17090791
申请日：2020-11-05
Applicant: CANON KABUSHIKI KAISHA
Inventor： Masato Ofuji , Jun Kawanabe , Kentaro Fujiyoshi , Minoru Watanabe , Kai Suzuki , Hideyuki Okada
IPC: G01T1/24
Abstract: An apparatus comprises a plurality of pixels each including a conversion element and a switch, a driving circuit configured to control the switches via drive lines, a bias power supply unit configured to supply a bias potential to the conversion element via a bias line, column signal lines to which signals are output from the plurality of pixels, and a detection unit. The plurality of pixels include a first pixel and a second pixel, which are adjacent to each other in the row direction and are connected to a common column signal line. The switch of the first pixel and the switch of the second pixel are connected to drive lines different from each other. The detection unit determines presence/absence of radiation irradiation based on a current flowing to the bias line.
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公开(公告)号：US10914849B2
公开(公告)日：2021-02-09
申请号：US16180756
申请日：2018-11-05
Applicant: CANON KABUSHIKI KAISHA
Inventor： Masato Ofuji , Minoru Watanabe , Kentaro Fujiyoshi , Sho Sato
Abstract: A radiation imaging apparatus includes a pixel portion in which a plurality of pixels, each pixel including a conversion element configured to convert radiation into charge, are arranged in a matrix, a driving circuit configured to drive a plurality of driving lines and a processing unit configured to process a signal from the pixel portion. The driving circuit performs a reset operation in which the conversion elements of the plurality of pixels are repetitively reset. The pixel portion includes rows in which the pixels have been divided into a plurality of groups. The conversion elements of the plurality of groups are reset at different timings in the reset operation, and the processing unit corrects, by using a signal of a pixel of another group, a signal of a pixel of a group with data deficiency caused by the reset operation.
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公开(公告)号：US10729393B2
公开(公告)日：2020-08-04
申请号：US15818427
申请日：2017-11-20
Applicant: CANON KABUSHIKI KAISHA
Inventor： Kentaro Fujiyoshi , Minoru Watanabe , Keigo Yokoyama , Masato Ofuji , Jun Kawanabe , Sho Sato , Kazuya Furumoto , Ryosuke Miura
Abstract: A radiographic imaging apparatus includes a pixel, a readout unit, and a signal processing unit. The pixel includes a switch configured to connect a conversion element configured to convert radiation into an electric signal to a signal line. The readout unit is configured to perform a first operation of reading out a first signal appearing in the signal line when the switch is not in a conductive state and a second operation of reading out a second signal appearing in the signal line when the switch is in a conductive state. The read out unit is configured to perform the first operation before performing the second operation a plurality of times consecutively. The signal processing unit is configured to perform signal processing for outputting information indicating irradiation of the radiographic imaging apparatus by the radiation based on the first signal and the second signal.
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Patent Agency Ranking
公开(公告)号：US20200166659A1
公开(公告)日：2020-05-28
申请号：US16686589
申请日：2019-11-18
Applicant: CANON KABUSHIKI KAISHA
Inventor： Kentaro Fujiyoshi , Minoru Watanabe , Ryosuke Miura
IPC: G01T1/24
Abstract: A radiation imaging apparatus includes a first pixel, and a second pixel whose sensitivity for radiation is lower than sensitivity of the first pixel; and a decision unit configured to execute a reset operation of resetting charges in the pixels and a decision operation of deciding a radiation dose during irradiation to the apparatus. In the decision operation, the decision unit reads out signals from the first and second pixels at least once, and decides first and second correction values based on the signal read out from the first and second pixel respectively, and reads out signals from the first and second pixels after receiving a radiation irradiation start request, and decides the radiation dose during irradiation to the apparatus using values of the signals read out from the first and second pixels and the first and second correction values.
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公开(公告)号：US20200008766A1
公开(公告)日：2020-01-09
申请号：US16571642
申请日：2019-09-16
Applicant: CANON KABUSHIKI KAISHA
Inventor： Minoru Watanabe , Kentaro Fujiyoshi , Sho Sato
Abstract: A radiation imaging apparatus is provided. The apparatus comprises: an imaging region in which a plurality of conversion elements are arranged, wherein the plurality of conversion elements includes a first conversion element configured to obtain a radiation image and a second conversion element configured to obtain irradiation information of incident radiation during radiation irradiation; a storage unit configured to store correction data for correcting a signal output from the first conversion element; and a control unit. The control unit determines a period to cause the first conversion element to perform an accumulation operation in accordance with the irradiation information, determines a correction amount corresponding to the period based on the correction data, and generates a radiation image signal by correcting a signal output from the first conversion element in accordance with the correction amount after the radiation irradiation.
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48.发明授权公开(公告)号：US10061039B2
公开(公告)日：2018-08-28
申请号：US15359169
申请日：2016-11-22
Applicant: CANON KABUSHIKI KAISHA
Inventor： Jun Kawanabe , Minoru Watanabe , Keigo Yokoyama , Masato Ofuji , Kazuya Furumoto
IPC: G01T1/24 , A61B6/00 , H04N5/378 , H04N5/32 , H01L27/146
CPC classification number: G01T1/247 , A61B6/4233 , A61B6/52 , H01L27/14612 , H01L27/14641 , H01L27/14663 , H04N5/32 , H04N5/378
Abstract: An apparatus includes a plurality of first groups having same configurations and arranged in a row direction and a column direction, each of the first groups including a plurality of pixels for obtaining a radiation image and at least one detection section for detecting an amount of incident radiation, and a plurality of detection signal lines connected to the plurality of detection sections. Two of the plurality of first groups which are arranged in the column direction are shifted from each other in the row direction, and the detection sections included in the two groups are connected to different detection signal lines in the plurality of detection signal lines.
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公开(公告)号：US09948871B2
公开(公告)日：2018-04-17
申请号：US14802297
申请日：2015-07-17
Applicant: CANON KABUSHIKI KAISHA
Inventor： Hiroshi Wayama , Minoru Watanabe , Keigo Yokoyama , Masato Ofuji , Jun Kawanabe , Kentaro Fujiyoshi
Abstract: A radiation imaging apparatus includes a radiation detection unit including a plurality of sensors which detect radiation, and a monitoring unit which monitors irradiation of radiation based on signals detected by the plurality of sensors. The monitoring unit determines a plurality of effective sensor candidates from the plurality of sensors, and determines effective sensor(s) from effective sensor candidates excluding certain effective sensor candidates of the plurality of effective sensor candidates, the certain effective sensor candidates being an effective sensor candidate which has detected a signal having a maximum value and an effective sensor candidate which has detected a signal having a minimum value. The monitoring unit monitors irradiation of radiation based on signal(s) detected by the effective sensor(s).
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公开(公告)号：US20180055464A1
公开(公告)日：2018-03-01
申请号：US15556714
申请日：2016-03-31
Applicant: CANON KABUSHIKI KAISHA
Inventor： Minoru Watanabe , Keigo Yokoyama , Masato Ofuji , Jun Kawanabe , Kentaro Fujiyoshi , Hiroshi Wayama , Kazuya Furumoto
IPC: A61B6/00 , H01L27/146 , H04N5/32
Abstract: A radiation imaging apparatus is provided. The apparatus comprises pixels arranged in an image sensing region, a first and a second detecting elements configured to obtain radiation irradiation information, a first signal line to which a signal from the first detecting element is to be output and a second signal line to which a signal from the second detecting element is to be output, and a signal processing circuit configured to process the signals output from the first and the second detecting elements. The first the second signal lines are arranged in the image sensing region or arranged adjacent to the image sensing region, the first detecting element has a larger region to detect radiation than the second detecting element. The signal processing circuit generates the radiation irradiation information based on the signals from the first and the second signal lines.
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