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公开(公告)号：US11029423B2
公开(公告)日：2021-06-08
申请号：US16808774
申请日：2020-03-04
Applicant: Hitachi, Ltd.
Inventor： Masafumi Onouchi , Takafumi Ishitsu , Fumito Watanabe
IPC: G01T1/24
Abstract: To provide a radiation imaging system which is adapted to downsize a photon counting radiation detector including a semiconductor layer for detecting photons of radiation and a collimator for suppressing incidence of scattered rays, and which ensures high voltage resistance. The radiation imaging system includes: a radiation source; a radiation detector; and a support portion for supporting the radiation source and the radiation detector in opposed relation. The system has a structure wherein the radiation detector includes a plurality of detecting element modules arranged in an arcuate form. The detecting element module includes a base fixed to the support portion; a semiconductor layer; a high-voltage wire for supplying high voltage to the semiconductor layer; a collimator for suppressing scattered rays, and a supporting column disposed at place within a predetermined distance from the semiconductor layer.
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公开(公告)号：US09757077B2
公开(公告)日：2017-09-12
申请号：US15038868
申请日：2014-10-29
Applicant: HITACHI, LTD.
Inventor： Atsuro Suzuki , Yuichiro Ueno , Takafumi Ishitsu , Wataru Takeuchi , Isao Takahashi
CPC classification number: A61B6/4435 , A61B6/037 , A61B6/06 , A61B6/4258 , A61B6/4266 , A61B6/4417 , A61B6/4452 , A61B6/50 , A61B6/503 , A61B6/5205 , A61B6/5258 , G01T1/1641 , G01T1/1644 , G01T1/2985
Abstract: When two detector panels are rotationally moved around the entire circumference of a region of interest and projection images of the region of interest are captured during the rotational movement, the respective detector panels are moved along the tangential direction of the rotational movement to a position where the union of the capturing ranges of the projection images captured by the respective detector panels covers the entire region of interest. The projection images captured by the respective detector panels are used to reconstruct a transaxial image of the region of interest.
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公开(公告)号：US11567016B2
公开(公告)日：2023-01-31
申请号：US17232217
申请日：2021-04-16
Applicant: Hitachi, Ltd.
Inventor： Masafumi Onouchi , Takafumi Ishitsu
IPC: G01N23/046 , G01N23/083
Abstract: There is provided a radiographic imaging apparatus capable of alignment of a detector with a collimator with a position of a radiation source fixed. The radiographic imaging apparatus includes the radiation source which irradiates a subject with radioactive rays, a plurality of detecting elements which detect photons in the radioactive rays, and a collimator which is disposed between the radiation source and the detecting elements and has a plurality of walls which form a plurality of passing holes that the radioactive rays pass. The detecting element and the collimator are aligned with each other in a direction which is orthogonal to a direction that the subject is irradiated with the radioactive rays such that a ratio or a difference between output signals from the detecting elements which are mutually adjacent with the wall being interposed falls within a predetermined range.
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公开(公告)号：US09390823B2
公开(公告)日：2016-07-12
申请号：US14433387
申请日：2013-10-03
Applicant: HITACHI, LTD.
Inventor： Atsuro Suzuki , Takafumi Ishitsu , Isao Takahashi , Wataru Takeuchi , Keiji Kobashi
CPC classification number: G21K1/02 , G01N23/046 , G01T1/1648 , G21K1/025 , G21K1/04
Abstract: There is provided is a radiation image acquiring device which corrects a positional displacement between a collimator and a detector and obtains an image without artifacts. The device includes a detector (21) to measure a radiation; a collimator (26) including a through-hole (27) having one or more detectors (21) disposed therein and configured to limit an incident direction of the radiation; a positional displacement measuring unit configured to measure a positional displacement between the detector (21) and the collimator (26) by use of a profile of a radiation source measured by the detector (21) based on the radiation source disposed corresponding to a predetermined detector (21).
Abstract translation: 提供了一种放射图像获取装置，其校正准直器和检测器之间的位置偏移，并且获得没有伪影的图像。 该装置包括用于测量辐射的检测器（21） 准直器（26），其包括具有设置在其中的一个或多个检测器（21）的通孔（27）并且被配置为限制所述辐射的入射方向; 位置位移测量单元，被配置为通过使用由检测器（21）测量的辐射源的轮廓基于对应于预定检测器设置的辐射源来测量检测器（21）和准直器（26）之间的位置位移 （21）。
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Patent Agency Ranking
公开(公告)号：US11523783B2
公开(公告)日：2022-12-13
申请号：US17230015
申请日：2021-04-14
Applicant: Hitachi, Ltd.
Inventor： Tatsuhiko Hayashi , Takafumi Ishitsu , Masafumi Onouchi
Abstract: There are provided a radiation detector module, a radiation detector, and a radiographic imaging apparatus which make it possible to increase the row number while suppressing a length in a body-axis direction. The radiation detector module includes a detector substrate on which a scintillator, a photodiode, and AD conversion chips are loaded, and a control substrate which supplies power to the detector substrate and controls the operation of an AD conversion unit (AFE) of each AD conversion chip of the detector substrate. The plurality of radiation detector modules configure a radiation detector which suppresses the length in the body-axis direction by connecting together the two substrates so as to form a two-stage structure by stacking connectors.
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公开(公告)号：US11169284B2
公开(公告)日：2021-11-09
申请号：US16719528
申请日：2019-12-18
Applicant: Hitachi, Ltd.
Inventor： Masafumi Onouchi , Takafumi Ishitsu , Fumito Watanabe
IPC: H01J37/244 , G01T1/24 , G01T1/29 , G01T1/17
Abstract: The present invention provides a radiation imaging apparatus capable of maintaining the quality of an image obtained even when a dose incident on a radiation detector changes suddenly. The present invention is a radiation imaging apparatus including a radiation source, a radiation detector to detect radiation emitted from the radiation source, and a cooling unit to cool the radiation detector; and is characterized in that the radiation detector has a counting circuit to output a number of photons in radiation counted per unit time as a photon counting rate, and the cooling unit controls a coolability of the radiation detector in response to the photon counting rate.
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公开(公告)号：US10292669B2
公开(公告)日：2019-05-21
申请号：US15560291
申请日：2016-03-18
Applicant: HITACHI, LTD.
Inventor： Takafumi Ishitsu , Isao Takahashi , Kazuma Yokoi
Abstract: To improve performance in Photon Counting CT, pixel miniaturization, a reduction in circuit dead time, and dealing with scattered radiation and charge sharing are important. In addition, because the number of circuits increases, a reduction in power consumption of each circuit is important. Under these constraints, circuitry that deals with the scattered radiation is provided. Each pixel includes a circuit that determines whether radiation has been detected by another, adjacent pixel at the same time, and counters that count the radiation are switched on the basis of the result of the determination. On the basis of this result, counts of non-coincident events are primarily used, and coincident counts are used after being corrected, for reconstruction data.
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公开(公告)号：US20150262721A1
公开(公告)日：2015-09-17
申请号：US14433387
申请日：2013-03-10
Applicant: HITACHI, LTD.
Inventor： Atsuro Suzuki , Takafumi Ishitsu , Isao Takahashi , Wataru Takeuchi , Keiji Kobashi
CPC classification number: G21K1/02 , G01N23/046 , G01T1/1648 , G21K1/025 , G21K1/04
Abstract: There is provided is a radiation image acquiring device which corrects a positional displacement between a collimator and a detector and obtains an image without artifacts. The device includes a detector (21) to measure a radiation; a collimator (26) including a through-hole (27) having one or more detectors (21) disposed therein and configured to limit an incident direction of the radiation; a positional displacement measuring unit configured to measure a positional displacement between the detector (21) and the collimator (26) by use of a profile of a radiation source measured by the detector (21) based on the radiation source disposed corresponding to a predetermined detector (21).
Abstract translation: 提供了一种放射图像获取装置，其校正准直器和检测器之间的位置偏移，并且获得没有伪影的图像。 该装置包括用于测量辐射的检测器（21） 准直器（26），其包括具有设置在其中的一个或多个检测器（21）的通孔（27）并且被配置为限制所述辐射的入射方向; 位置位移测量单元，被配置为通过使用由检测器（21）测量的辐射源的轮廓基于对应于预定检测器设置的辐射源来测量检测器（21）和准直器（26）之间的位置位移 （21）。
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公开(公告)号：US10299746B2
公开(公告)日：2019-05-28
申请号：US16063706
申请日：2016-12-21
Applicant: HITACHI, LTD.
Inventor： Takafumi Ishitsu , Isao Takahashi , Kazuma Yokoi , Makoto Satou
Abstract: A radiation imaging apparatus provided with a detector capable of improving correction accuracy at a high counting rate. The present invention is provided with: grids that remove scattered beams that emanate from an object; and a plurality of detector sub-pixels arranged so as to divide the gap between the grids into three or more segments, wherein the area of each of the detector sub-pixels located below the wall surface of the grids is larger than that of each of the other detector sub-pixels in a planar view. The size of each of the detector sub-pixels not located below the wall surface of the grids is expressed as (Pg−Tg−Lsplit×2)/N, where Pg represents the pitch between the grids, Tg represents the thickness of each of the grids, and N represents the number of segments formed by the detector sub-pixels between the grids.
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