US20120163555A1 - Radiation imaging apparatus - Google Patents
Radiation imaging apparatus Download PDFInfo
- Publication number
- US20120163555A1 US20120163555A1 US13/413,022 US201213413022A US2012163555A1 US 20120163555 A1 US20120163555 A1 US 20120163555A1 US 201213413022 A US201213413022 A US 201213413022A US 2012163555 A1 US2012163555 A1 US 2012163555A1
- Authority
- US
- United States
- Prior art keywords
- grid
- imaging unit
- unit
- radiation
- imaging
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000003384 imaging method Methods 0.000 title claims abstract description 98
- 230000005855 radiation Effects 0.000 title claims abstract description 39
- 238000001514 detection method Methods 0.000 claims abstract description 10
- 238000009826 distribution Methods 0.000 claims abstract description 5
- 238000002601 radiography Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 10
- 239000011888 foil Substances 0.000 description 9
- 230000035939 shock Effects 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000004065 semiconductor Substances 0.000 description 6
- 238000012545 processing Methods 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000009467 reduction Effects 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 229920005989 resin Polymers 0.000 description 3
- 239000011347 resin Substances 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000000758 substrate Substances 0.000 description 3
- 229920000049 Carbon (fiber) Polymers 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004917 carbon fiber Substances 0.000 description 2
- 230000006378 damage Effects 0.000 description 2
- 229920001971 elastomer Polymers 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000001678 irradiating effect Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- FYYHWMGAXLPEAU-UHFFFAOYSA-N Magnesium Chemical compound [Mg] FYYHWMGAXLPEAU-UHFFFAOYSA-N 0.000 description 1
- 208000027418 Wounds and injury Diseases 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 239000000806 elastomer Substances 0.000 description 1
- 238000007429 general method Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 208000014674 injury Diseases 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 239000011777 magnesium Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 150000002736 metal compounds Chemical class 0.000 description 1
- 238000009659 non-destructive testing Methods 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 239000011359 shock absorbing material Substances 0.000 description 1
- 229920003002 synthetic resin Polymers 0.000 description 1
- 239000000057 synthetic resin Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000013585 weight reducing agent Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/06—Diaphragms
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4208—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector
- A61B6/4233—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis characterised by using a particular type of detector using matrix detectors
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/42—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis
- A61B6/4291—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment with arrangements for detecting radiation specially adapted for radiation diagnosis the detector being combined with a grid or grating
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B42/00—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means
- G03B42/02—Obtaining records using waves other than optical waves; Visualisation of such records by using optical means using X-rays
- G03B42/04—Holders for X-ray films
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B6/00—Apparatus for radiation diagnosis, e.g. combined with radiation therapy equipment
- A61B6/50—Clinical applications
- A61B6/501—Clinical applications involving diagnosis of head, e.g. neuroimaging, craniography
Definitions
- the present invention relates to a radiation imaging apparatus using a portable solid-state imaging device configured to allow a grid to be mounted outside the housing.
- rare-earth fluorescent sheets which emit light upon application of radiation are held in tight contact with the two surfaces of a photosensitive film.
- the fluorescent converts radiation transmitted through an object into visible light.
- the method then develops, by chemical treatment, the latent image formed on the photosensitive film by making it capture this visible light, thereby visualizing the image.
- the recent advances in digital technology have popularized the scheme of obtaining high-quality radiographic images by converting radiographic images into electrical signals, performing image processing for the obtained electrical signals, and then reproducing the resultant information as visible images on a CRT or the like.
- a radiographic image recording/reproduction system which temporarily stores a transmission image of radiation as a latent image in a fluorescent, photoelectrically reads out the latent image by irradiating the fluorescent with exciting light such as a laser beam, and then outputs the readout image as a visible image.
- semiconductor process technology there has been developed an apparatus for capturing a radiographic image in the same manner as described above by using a semiconductor sensor.
- FIG. 7 is a view showing the arrangement of a radiation imaging system using the above semiconductor sensor.
- a radiation imaging apparatus 103 mounted on a radiographic stand 106 includes a solid-state imaging device 104 having a detection surface on which a plurality of photoelectric conversion elements are two-dimensionally arranged.
- a radiation generator (X-ray tube) 101 emits radiation to irradiate an object 102 .
- the solid-state imaging device 104 then images the radiation transmitted through the object 102 , and converts it into visible light through the fluorescent.
- a control unit 107 reads out the electrical signal output from the solid-state imaging device 104 , performs digital image processing for the signal, and then displays the resultant information as a radiographic image of the object 102 on a monitor 108 .
- the radiation imaging apparatus 103 as an imaging unit incorporates an anti-scatter grid (to be referred to as a grid hereinafter) 105 .
- the grid is designed to remove scattered X-rays generated inside the object (e.g., a human body) 102 upon X-ray irradiation, and is used to improve the contrast of an X-ray image.
- This apparatus performs radiography with the grid 105 being disposed between the X-ray tube 101 and a detector such as a film.
- Such grids are defined as JIS Z 4910 anti-scatter grids, which will be briefly described below.
- FIG. 8 is a schematic sectional view of the grid described above. X-rays are applied from a direction A on the left side of FIG. 8 .
- the grid is formed by alternately stacking foils 201 made of a material having a high X-ray absorptance and intermediate materials 202 having a low X-ray absorptance.
- lead is used for the foils 201 having a high absorptance
- aluminum, paper, wood, synthetic resin, carbon fiber reinforced resin, or the like is used for the intermediate materials 202 having a low X-ray absorptance.
- the outer surface of this multilayered structure is covered by, for example, an aluminum or carbon fiber reinforced resin cover.
- the above grid is a focused grid including a foil represented by a foil 201 a which is located at a central portion immediately below the X-ray source and is perpendicular to the cover and foils 201 b which gradually tilt in the direction of the light source toward the fringes.
- a focused grid it is necessary to perform radiography upon adjusting the distance between the grid and the light source and their centers.
- a grid without any tilting of foils is also available, which is called a parallel grid.
- Such grids differ in the property of attenuating transmitted X-rays depending on the density or geometrical shape of foils.
- a grid with optimal specifications is selected in accordance with radiography.
- the solid-state imaging device 104 described above is generally selected so as to prevent the pixel size from interfering with the intervals between grid foils in terms of frequency.
- An imaging apparatus of this type has been installed and used in a radiation room. Recently, a portable imaging apparatus (also called an electronic cassette) has also been provided to allow quicker radiography of regions in a wider range.
- Such an electronic cassette is required to be low in profile and lightweight and have high mechanical strength.
- cassette radiography a person as an object may be rested on the cassette.
- a shock may act on the cassette if it is dropped or collides with something.
- it is necessary to greatly improve the resistance of such electronic cassettes in terms of mechanical strength.
- a cassette can be applied to various regions, and hence the grid is preferably configured to be easily attached/detached depending on a region to be radiographed. Therefore, a grid which can be mounted outside an imaging unit has been proposed as disclosed in Japanese Patent Laid-Open No. 2004-177251. This grid is mounted on a metal frame component to secure its mechanical strength.
- the first characteristic is that a metal frame member is mounted on the grid body to protect it in terms of mechanical strength.
- the second characteristic is associated with the pixel array of the imaging unit and the relative angle of the grid lattice.
- the grid is mounted on the imaging unit with a side wall being provided on a frame member for positional restriction for the imaging unit.
- some grids have a buffer member mounted on a side wall to prevent the operator from being injured if the grid is accidentally dropped or to prevent the grid from being damaged during transport.
- the present invention provides a radiation imaging apparatus including a grid unit which makes improvements in the distance to an effective imaging area and the mass, which contradict the implementation of required relative angle restriction, the securement of mechanical strength, and protection against a shock.
- the present invention relates to a radiation imaging apparatus comprising a detection unit for detecting a radiation distribution transmitted through an object, an imaging unit which includes the detection unit, and a grid for suppressing scattered light which is detachably mounted on an outside of the imaging unit, wherein the imaging unit includes a buffer member on a side surface facing a surface side which radiation strikes, the grid includes a grid body placed on the surface side which the radiation strikes, and a fixing unit for fixing the grid body to the imaging unit, and sides constituting the fixing unit include a side which does not protrude from an outer shape of the imaging unit when viewed from the surface side which the radiation strikes.
- FIG. 1 is a front view of a radiation imaging unit according to the first embodiment
- FIG. 2 is a front view showing the imaging unit according to the first embodiment when a grid unit is mounted on it;
- FIG. 3 is a side sectional view taken along a line A-A of the imaging unit according to the first embodiment with the grid unit being mounted on it;
- FIG. 4 is a side sectional view taken along a line B-B of the imaging unit according to the first embodiment with the grid unit being mounted on it;
- FIG. 5 is a front view showing an imaging unit according to the second embodiment when a grid unit is mounted on it;
- FIG. 6 is a front view showing an imaging unit according to the third embodiment when a grid unit is mounted on it;
- FIG. 7 is a view showing the arrangement of a conventional radiation imaging system
- FIG. 8 is a view for explaining a grid
- FIG. 9 is a view for explaining how a head portion is placed in radiography of a side surface of the head portion.
- FIGS. 1 to 4 show an X-ray imaging apparatus according to an embodiment of the present invention.
- FIG. 1 is a front view showing an imaging unit alone when viewed from the X-ray incident surface.
- FIG. 2 is a front view showing the imaging unit when a grid unit is mounted on it.
- reference numeral 1 denotes an imaging unit; and 10 , an anti-scatter grid unit.
- FIG. 3 is a side sectional view taken along a line A-A in FIG. 2 .
- FIG. 4 is a side sectional view taken along a line B-B in FIG. 2 .
- FIG. 1 is a front view showing the radiation imaging unit 1 alone when viewed from the X-ray incident surface side.
- An X-ray detection unit which receives X-rays and detects a radiation distribution is rectangular.
- a housing lid 2 b is placed on the X-ray incident surface side so as to cover an image-receiving area.
- the housing lid 2 b is made of a material having a high X-ray transmittance.
- the housing lid 2 b is combined with a housing body 2 a to form a closed type housing 2 having a rectangular shape (almost a quadrangle).
- the radiation imaging unit 1 described above is used singly as a cassette or used in combination with various gantries. Requirements for transportation in changing the state of use are that the imaging unit 1 is lightweight, and has mechanical strength sufficient to maintain functionality even if it is dropped. In addition, when the imaging unit 1 is to be used as a cassette, the unit must be made low in profile to prevent a person as an object from feeling pain even if the unit is placed under him/her, and needs to have mechanical strength high enough to allow him/her to directly rest upon it.
- the imaging unit 1 has a handle and a buffer function.
- the imaging unit 1 has a hole 9 as a handle which extends through part of the housing. This allows stable gripping of the imaging unit 1 during transportation.
- a buffer member 8 is placed around the side surfaces of the imaging unit 1 when viewed from the X-ray irradiation surface side.
- the buffer member 8 is placed on the imaging unit 1 as shown in FIG. 1 because the three sides other than one side (near the handle) where the handle is formed tend to sustain damage due to collisions with other objects or due to dropping when the operator carries the unit while gripping the handle.
- the buffer member 8 is made of a shock absorbing material such as rubber or an elastomer, and is aimed at protecting an operator as well as other people from injury to themselves as well as at reducing the shock absorbed by the imaging unit 1 .
- the imaging unit 1 described above is used in combination with a detachable grid for suppressing scattered light to improve the contrast of an X-ray image by removing scattered X-rays generated inside an object (e.g., a human body) upon X-ray irradiation. Since grids having different X-ray shielding characteristics are selectively used in accordance with the region to be radiographed, the grid unit is designed to be externally attached/detached to/from the housing 2 so as to be easily attached/detached to/from the imaging unit, as shown in FIG. 2 .
- a metal base 4 is fixed in the housing 2 through a support portion 3 , and an X-ray image detection panel 5 formed by stacking a substrate 5 a , photoelectric conversion elements 5 b , and a fluorescent plate 5 c is placed on the base 4 .
- a substrate 5 a a glass plate is often used because, for example, it must not have any chemical action with a semiconductor element and needs to endure the semiconductor process temperature and have dimensional stability.
- the photoelectric conversion elements 5 b are formed on the substrate 5 a in a two-dimensional array by a semiconductor process.
- the fluorescent plate 5 c used is one that is formed by coating a resin plate with a metal compound fluorescent. They are integrated with each other with an adhesive.
- the photoelectric conversion elements 5 b are connected, through a flexible circuit board 6 connected to their side surfaces, to a circuit board 7 which is placed on the lower surface of the base 4 and on which electronic parts for processing electrical signals having undergone photoelectric conversion are mounted.
- the circuit board 7 is connected to an external control unit (not shown) to, for example, supply power and transfer signals.
- the radiation imaging unit 1 described above can perform radiography by being used in combination with an X-ray tube which emits X-rays.
- an X-ray tube which emits X-rays.
- the fluorescent plate 5 c of the X-ray image detection panel 5 emits light.
- the two-dimensionally arrayed photoelectric conversion elements 5 b convert the light into electrical signals, thereby obtaining a digital image.
- This digital image is further transferred to the external control unit. This allows the operator to observe the image on a monitor (not shown) in real time.
- the grid unit 10 includes a grid body 11 and a metal frame 12 .
- the grid body 11 has a layer structure constituted by an X-ray shield member and an intermediate material having small X-ray absorption, and hence is low in mechanical strength.
- the grid body 11 is therefore attached with the frame 12 as a reinforced frame which has an X-ray transmission opening portion 12 a .
- the grid body 11 is held on the surface of the imaging unit 1 on the incident surface side in tight contact with it.
- the frame 12 shown in FIG. 3 has a cross-section in a direction parallel to the side having the handle.
- This frame has two side portions 12 b which are bent by the thickness of the grid.
- This shape can make the edge of the frame end portion difficult to come into contact with an object and can increase the mechanical strength of the frame 12 , as compared with the simple planar shape like that denoted by reference symbol E in FIG. 3 .
- this frame can achieve a great reduction in weight as compared with a conventional frame covering the entire side surfaces.
- the distal ends of the bent portions 12 b do not protrude outside the buffer member 8 on the side surfaces of the imaging unit.
- This shape allows the buffer member 8 of the imaging unit 1 , which is placed outside, to receive a shock first, thus reducing the shock directly acting on the grid frame 12 . Even if the grid unit 10 is attached to the imaging unit 1 , the distance from the outermost shape to the effective imaging area does not change. This makes it possible to perform positioning in the same manner and eliminate the necessity to use any tool to newly correct an offset relative to an object.
- a means for attaching the grid unit 10 to the imaging unit 1 will be described with reference to FIG. 4 .
- the frame 12 is bent in an almost U shape to have bent portions 12 c and 12 d so as to hold, between them, the side having the handle and its opposite side.
- a stepped portion 2 c is formed on the housing 2 so as to lock a bent portion 12 e of the frame.
- the frame 12 is mounted on the housing 2 while a side surface wall 2 d of the stepped portion 2 c restricts the movement of the frame 12 in the horizontal direction (the vertical direction in FIG. 4 ).
- a stepped portion is also provided on the side on the handle side so as to lock a hook 13 d of a slide member 13 provided on the bent portion 12 c of the frame 12 .
- a guide member 13 c is mounted on the slide member 13 so as to be slidable on guide grooves 12 f formed in the bent portion 12 c . Simple operation can detachably mount the grid unit 10 on the imaging unit 1 .
- This lock mechanism allows to safely carry the imaging unit 1 even while the grid unit 10 is mounted on it.
- the bent portion 12 d of the frame 12 and the slide member 13 hold the imaging unit 1 between them. This structure therefore restricts the rotation of the grid unit 10 so as to make the relative angle of the grid unit 10 with respect to the imaging unit 1 fall within a predetermined angle.
- FIG. 5 shows an X-ray imaging apparatus according to another embodiment of the present invention, which is a modification of the above embodiment.
- the frame of the grid unit is formed to expose the buffer member provided on the side surfaces of the imaging unit on the two sides perpendicular to the side where the handle is formed, and the grip unit defines the outermost shape on the side on which the handle is formed and its opposite side. If an imaging area is rectangular, it is necessary to select the portrait orientation or the landscape orientation as the suitable posture of the imaging unit. If radiography is performed with the long side being the bottom, the distance from the outermost shape to the effective imaging area undesirably increases.
- a buffer member is partly notched to be divided into parts 22 , 23 , and 24 .
- Bent portions 32 a and 32 b for locking which are provided on a frame member 32 on which a grid 31 is to be mounted are placed in the gaps between the respective parts.
- the buffer members 22 , 23 , and 24 of an imaging unit 21 on the sides other than the side where a handle 29 is formed each define the outermost shape. That is, the three sides have the same effect as that described in the first embodiment. Setting the width of the bent portions 32 a and 32 b to reduce backlash in the gaps between the respective parts of the buffer member can manage the relative position accuracy of the grid 31 with respect to the imaging unit 21 within a predetermined range.
- FIG. 6 shows an X-ray imaging apparatus according to still another embodiment of the present invention, which is a modification of the embodiment shown in FIG. 5 .
- the outer shape of the imaging unit defines the outermost shape at the three sides.
- a grid unit is formed such that the outer shape of an imaging unit at the four sides including the side where a handle is formed defines the outermost shape.
- Buffer members 42 and 43 are placed on the entire side surfaces of an imaging unit 41 . This arrangement allows the effect of reducing shock even when the imaging unit 41 is accidentally dropped as well as when a shock acts on the imaging unit 41 while the operator is gripping the handle and transporting the imaging unit 41 .
- a grid unit 50 includes a lock portion 53 which is locked in a through hole 49 formed as a handle. The grid unit 50 is mounted on the imaging unit 41 by holding it with bent portions 52 a and 52 b and the lock portion 53 .
- a grid frame 52 does not completely protrude from the outer shape of the imaging unit 41 when viewed from the incident surface side. This makes it possible to maintain the same effect against a shock from the side surface direction as that obtained when the imaging unit is used singly, even in a state in which the grid unit 50 is mounted on the imaging unit.
- aspects of the present invention can also be realized by a computer of a system or apparatus (or devices such as a CPU or MPU) that reads out and executes a program recorded on a memory device to perform the functions of the above-described embodiment(s), and by a method, the steps of which are performed by a computer of a system or apparatus by, for example, reading out and executing a program recorded on a memory device to perform the functions of the above-described embodiment(s).
- the program is provided to the computer for example via a network or from a recording medium of various types serving as the memory device (e.g., computer-readable medium).
Abstract
A radiation imaging apparatus comprising a detection unit for detecting a radiation distribution transmitted through an object, an imaging unit which includes the detection unit, and a grid for suppressing scattered light which is detachably mounted on an outside of the imaging unit, wherein the imaging unit includes a buffer member on a side surface facing a surface side which radiation strikes, the grid includes a grid body placed on the surface side which the radiation strikes, and a fixing unit for fixing the grid body to the imaging unit, and sides constituting the fixing unit include a side which does not protrude from an outer shape of the imaging unit when viewed from the surface side which the radiation strikes.
Description
- The present application is a continuation of application Ser. No. 12/725,544, filed Mar. 17, 2010. The present application claims benefit of parent application Ser. No. 12/725,544 under 35 U.S.C. §120, and claims priority benefit under 35 U.S.C. §119 of Japanese Patent Application 2009-090486, filed Apr. 2, 2009. The entire contents of each of the mentioned prior applications are incorporated herein by reference.
- 1. Field of the Invention
- The present invention relates to a radiation imaging apparatus using a portable solid-state imaging device configured to allow a grid to be mounted outside the housing.
- 2. Description of the Related Art
- Conventionally, apparatuses which obtain radiographic images of objects by irradiating the objects with radiation and detecting the intensity distributions of radiation transmitted through the objects have been widely and generally used in the fields of industrial nondestructive testing and medical diagnosis. As a general method for such radiography, a film/screen method using radiation is available. This is the method of performing radiography by using a combination of a photosensitive film and a fluorescent having sensitivity to radiation.
- In this method, rare-earth fluorescent sheets which emit light upon application of radiation are held in tight contact with the two surfaces of a photosensitive film. The fluorescent converts radiation transmitted through an object into visible light. The method then develops, by chemical treatment, the latent image formed on the photosensitive film by making it capture this visible light, thereby visualizing the image.
- The recent advances in digital technology have popularized the scheme of obtaining high-quality radiographic images by converting radiographic images into electrical signals, performing image processing for the obtained electrical signals, and then reproducing the resultant information as visible images on a CRT or the like. As such a method, there has been proposed a radiographic image recording/reproduction system which temporarily stores a transmission image of radiation as a latent image in a fluorescent, photoelectrically reads out the latent image by irradiating the fluorescent with exciting light such as a laser beam, and then outputs the readout image as a visible image. In addition, with the recent advances in semiconductor process technology, there has been developed an apparatus for capturing a radiographic image in the same manner as described above by using a semiconductor sensor.
- These systems have very wide dynamic ranges as compared with conventional radiographic systems using photosensitive films, and can obtain radiographic images which are robust against the influences of variations in the amount of radiation exposure. At the same time, unlike the conventional photosensitive film scheme, this method need not perform any chemical treatment and can instantly obtain an output image.
-
FIG. 7 is a view showing the arrangement of a radiation imaging system using the above semiconductor sensor. Aradiation imaging apparatus 103 mounted on aradiographic stand 106 includes a solid-state imaging device 104 having a detection surface on which a plurality of photoelectric conversion elements are two-dimensionally arranged. - A radiation generator (X-ray tube) 101 emits radiation to irradiate an
object 102. The solid-state imaging device 104 then images the radiation transmitted through theobject 102, and converts it into visible light through the fluorescent. Acontrol unit 107 reads out the electrical signal output from the solid-state imaging device 104, performs digital image processing for the signal, and then displays the resultant information as a radiographic image of theobject 102 on amonitor 108. - The
radiation imaging apparatus 103 as an imaging unit incorporates an anti-scatter grid (to be referred to as a grid hereinafter) 105. The grid is designed to remove scattered X-rays generated inside the object (e.g., a human body) 102 upon X-ray irradiation, and is used to improve the contrast of an X-ray image. This apparatus performs radiography with thegrid 105 being disposed between theX-ray tube 101 and a detector such as a film. Such grids are defined as JIS Z 4910 anti-scatter grids, which will be briefly described below. -
FIG. 8 is a schematic sectional view of the grid described above. X-rays are applied from a direction A on the left side ofFIG. 8 . The grid is formed by alternately stackingfoils 201 made of a material having a high X-ray absorptance andintermediate materials 202 having a low X-ray absorptance. In general, lead is used for thefoils 201 having a high absorptance, and aluminum, paper, wood, synthetic resin, carbon fiber reinforced resin, or the like is used for theintermediate materials 202 having a low X-ray absorptance. The outer surface of this multilayered structure is covered by, for example, an aluminum or carbon fiber reinforced resin cover. - In many cases, the above grid is a focused grid including a foil represented by a
foil 201 a which is located at a central portion immediately below the X-ray source and is perpendicular to the cover andfoils 201 b which gradually tilt in the direction of the light source toward the fringes. When a focused grid is to be used, it is necessary to perform radiography upon adjusting the distance between the grid and the light source and their centers. A grid without any tilting of foils is also available, which is called a parallel grid. Such grids differ in the property of attenuating transmitted X-rays depending on the density or geometrical shape of foils. A grid with optimal specifications is selected in accordance with radiography. In particular, the solid-state imaging device 104 described above is generally selected so as to prevent the pixel size from interfering with the intervals between grid foils in terms of frequency. - An imaging apparatus of this type has been installed and used in a radiation room. Recently, a portable imaging apparatus (also called an electronic cassette) has also been provided to allow quicker radiography of regions in a wider range.
- Such an electronic cassette is required to be low in profile and lightweight and have high mechanical strength. In cassette radiography, a person as an object may be rested on the cassette. In addition, since the electronic cassette is portable, a shock may act on the cassette if it is dropped or collides with something. As compared with conventional stationary imaging units, therefore, it is necessary to greatly improve the resistance of such electronic cassettes in terms of mechanical strength.
- A cassette can be applied to various regions, and hence the grid is preferably configured to be easily attached/detached depending on a region to be radiographed. Therefore, a grid which can be mounted outside an imaging unit has been proposed as disclosed in Japanese Patent Laid-Open No. 2004-177251. This grid is mounted on a metal frame component to secure its mechanical strength.
- As a grid mounted outside an imaging unit like that described above, a grid having the following characteristics has been provided. The first characteristic is that a metal frame member is mounted on the grid body to protect it in terms of mechanical strength. The second characteristic is associated with the pixel array of the imaging unit and the relative angle of the grid lattice.
- Unlike film radiography, digital imaging has the merit of reducing, by image processing, streaks appearing on an image when the foils of the grid are captured on it. For this reason, the relative angle preferably falls within the computational tolerance of image processing. Therefore, in order to make the relative angle fall within the tolerance range, the grid is mounted on the imaging unit with a side wall being provided on a frame member for positional restriction for the imaging unit. In addition, some grids have a buffer member mounted on a side wall to prevent the operator from being injured if the grid is accidentally dropped or to prevent the grid from being damaged during transport.
- Consider a case in which a portable
X-ray imaging apparatus 111 is used to radiograph a side surface of ahead portion 110 on a table 114, as shown inFIG. 9 . In this case, since a distance L from the outer shape of agrid fixing frame 113 to aneffective imaging area 112 of theimaging unit 111 is large, it is necessary to use a tool for applying some correction for an offset relative to an object. That is, such radiography accompanies cumbersome operation. - Studies have been focused on the imaging unit to meet the requirement for a reduction in weight. In practice, however, it is necessary to implement weight reduction, including a reduction in the weight of the grid.
- The present invention provides a radiation imaging apparatus including a grid unit which makes improvements in the distance to an effective imaging area and the mass, which contradict the implementation of required relative angle restriction, the securement of mechanical strength, and protection against a shock.
- According to one aspect of embodiments, the present invention relates to a radiation imaging apparatus comprising a detection unit for detecting a radiation distribution transmitted through an object, an imaging unit which includes the detection unit, and a grid for suppressing scattered light which is detachably mounted on an outside of the imaging unit, wherein the imaging unit includes a buffer member on a side surface facing a surface side which radiation strikes, the grid includes a grid body placed on the surface side which the radiation strikes, and a fixing unit for fixing the grid body to the imaging unit, and sides constituting the fixing unit include a side which does not protrude from an outer shape of the imaging unit when viewed from the surface side which the radiation strikes.
- Further features of the present invention will become apparent from the following description of exemplary embodiments (with reference to the attached drawings).
-
FIG. 1 is a front view of a radiation imaging unit according to the first embodiment; -
FIG. 2 is a front view showing the imaging unit according to the first embodiment when a grid unit is mounted on it; -
FIG. 3 is a side sectional view taken along a line A-A of the imaging unit according to the first embodiment with the grid unit being mounted on it; -
FIG. 4 is a side sectional view taken along a line B-B of the imaging unit according to the first embodiment with the grid unit being mounted on it; -
FIG. 5 is a front view showing an imaging unit according to the second embodiment when a grid unit is mounted on it; -
FIG. 6 is a front view showing an imaging unit according to the third embodiment when a grid unit is mounted on it; -
FIG. 7 is a view showing the arrangement of a conventional radiation imaging system; -
FIG. 8 is a view for explaining a grid; and -
FIG. 9 is a view for explaining how a head portion is placed in radiography of a side surface of the head portion. - The embodiments of the present invention will be described in detail with reference to the accompanying drawings.
-
FIGS. 1 to 4 show an X-ray imaging apparatus according to an embodiment of the present invention.FIG. 1 is a front view showing an imaging unit alone when viewed from the X-ray incident surface.FIG. 2 is a front view showing the imaging unit when a grid unit is mounted on it. Referring toFIG. 2 ,reference numeral 1 denotes an imaging unit; and 10, an anti-scatter grid unit. -
FIG. 3 is a side sectional view taken along a line A-A inFIG. 2 .FIG. 4 is a side sectional view taken along a line B-B inFIG. 2 . -
FIG. 1 is a front view showing theradiation imaging unit 1 alone when viewed from the X-ray incident surface side. An X-ray detection unit which receives X-rays and detects a radiation distribution is rectangular. Ahousing lid 2 b is placed on the X-ray incident surface side so as to cover an image-receiving area. Thehousing lid 2 b is made of a material having a high X-ray transmittance. Thehousing lid 2 b is combined with ahousing body 2 a to form aclosed type housing 2 having a rectangular shape (almost a quadrangle). - The
radiation imaging unit 1 described above is used singly as a cassette or used in combination with various gantries. Requirements for transportation in changing the state of use are that theimaging unit 1 is lightweight, and has mechanical strength sufficient to maintain functionality even if it is dropped. In addition, when theimaging unit 1 is to be used as a cassette, the unit must be made low in profile to prevent a person as an object from feeling pain even if the unit is placed under him/her, and needs to have mechanical strength high enough to allow him/her to directly rest upon it. - For this purpose, a material such as aluminum or magnesium is used for the
housing body 2 a to achieve a reduction in weight. In addition, to prevent accidents during transportation like those described above, theimaging unit 1 has a handle and a buffer function. Theimaging unit 1 has ahole 9 as a handle which extends through part of the housing. This allows stable gripping of theimaging unit 1 during transportation. A buffer member 8 is placed around the side surfaces of theimaging unit 1 when viewed from the X-ray irradiation surface side. - The buffer member 8 is placed on the
imaging unit 1 as shown inFIG. 1 because the three sides other than one side (near the handle) where the handle is formed tend to sustain damage due to collisions with other objects or due to dropping when the operator carries the unit while gripping the handle. The buffer member 8 is made of a shock absorbing material such as rubber or an elastomer, and is aimed at protecting an operator as well as other people from injury to themselves as well as at reducing the shock absorbed by theimaging unit 1. - The
imaging unit 1 described above is used in combination with a detachable grid for suppressing scattered light to improve the contrast of an X-ray image by removing scattered X-rays generated inside an object (e.g., a human body) upon X-ray irradiation. Since grids having different X-ray shielding characteristics are selectively used in accordance with the region to be radiographed, the grid unit is designed to be externally attached/detached to/from thehousing 2 so as to be easily attached/detached to/from the imaging unit, as shown inFIG. 2 . - Referring to the side sectional view shown in
FIG. 3 , ametal base 4 is fixed in thehousing 2 through asupport portion 3, and an X-rayimage detection panel 5 formed by stacking asubstrate 5 a,photoelectric conversion elements 5 b, and afluorescent plate 5 c is placed on thebase 4. As thesubstrate 5 a, a glass plate is often used because, for example, it must not have any chemical action with a semiconductor element and needs to endure the semiconductor process temperature and have dimensional stability. - The
photoelectric conversion elements 5 b are formed on thesubstrate 5 a in a two-dimensional array by a semiconductor process. Thefluorescent plate 5 c used is one that is formed by coating a resin plate with a metal compound fluorescent. They are integrated with each other with an adhesive. In addition, thephotoelectric conversion elements 5 b are connected, through aflexible circuit board 6 connected to their side surfaces, to acircuit board 7 which is placed on the lower surface of thebase 4 and on which electronic parts for processing electrical signals having undergone photoelectric conversion are mounted. Thecircuit board 7 is connected to an external control unit (not shown) to, for example, supply power and transfer signals. - The
radiation imaging unit 1 described above can perform radiography by being used in combination with an X-ray tube which emits X-rays. When the X-rays emitted by the X-ray tube positioned above theimaging unit 1 are transmitted through an object and strike theradiation imaging unit 1, thefluorescent plate 5 c of the X-rayimage detection panel 5 emits light. The two-dimensionally arrayedphotoelectric conversion elements 5 b convert the light into electrical signals, thereby obtaining a digital image. This digital image is further transferred to the external control unit. This allows the operator to observe the image on a monitor (not shown) in real time. - The
grid unit 10 includes agrid body 11 and ametal frame 12. As described above, thegrid body 11 has a layer structure constituted by an X-ray shield member and an intermediate material having small X-ray absorption, and hence is low in mechanical strength. Thegrid body 11 is therefore attached with theframe 12 as a reinforced frame which has an X-raytransmission opening portion 12 a. Thegrid body 11 is held on the surface of theimaging unit 1 on the incident surface side in tight contact with it. - The
frame 12 shown inFIG. 3 has a cross-section in a direction parallel to the side having the handle. This frame has twoside portions 12 b which are bent by the thickness of the grid. This shape can make the edge of the frame end portion difficult to come into contact with an object and can increase the mechanical strength of theframe 12, as compared with the simple planar shape like that denoted by reference symbol E inFIG. 3 . In addition, this frame can achieve a great reduction in weight as compared with a conventional frame covering the entire side surfaces. - Furthermore, the distal ends of the
bent portions 12 b do not protrude outside the buffer member 8 on the side surfaces of the imaging unit. This shape allows the buffer member 8 of theimaging unit 1, which is placed outside, to receive a shock first, thus reducing the shock directly acting on thegrid frame 12. Even if thegrid unit 10 is attached to theimaging unit 1, the distance from the outermost shape to the effective imaging area does not change. This makes it possible to perform positioning in the same manner and eliminate the necessity to use any tool to newly correct an offset relative to an object. - A means for attaching the
grid unit 10 to theimaging unit 1 will be described with reference toFIG. 4 . Theframe 12 is bent in an almost U shape to havebent portions housing 2 so as to lock abent portion 12 e of the frame. Theframe 12 is mounted on thehousing 2 while aside surface wall 2 d of the stepped portion 2 c restricts the movement of theframe 12 in the horizontal direction (the vertical direction inFIG. 4 ). - On the other hand, a stepped portion is also provided on the side on the handle side so as to lock a
hook 13 d of aslide member 13 provided on thebent portion 12 c of theframe 12. Aguide member 13 c is mounted on theslide member 13 so as to be slidable onguide grooves 12 f formed in thebent portion 12 c. Simple operation can detachably mount thegrid unit 10 on theimaging unit 1. - This lock mechanism allows to safely carry the
imaging unit 1 even while thegrid unit 10 is mounted on it. Thebent portion 12 d of theframe 12 and theslide member 13 hold theimaging unit 1 between them. This structure therefore restricts the rotation of thegrid unit 10 so as to make the relative angle of thegrid unit 10 with respect to theimaging unit 1 fall within a predetermined angle. -
FIG. 5 shows an X-ray imaging apparatus according to another embodiment of the present invention, which is a modification of the above embodiment. According to the above embodiment, the frame of the grid unit is formed to expose the buffer member provided on the side surfaces of the imaging unit on the two sides perpendicular to the side where the handle is formed, and the grip unit defines the outermost shape on the side on which the handle is formed and its opposite side. If an imaging area is rectangular, it is necessary to select the portrait orientation or the landscape orientation as the suitable posture of the imaging unit. If radiography is performed with the long side being the bottom, the distance from the outermost shape to the effective imaging area undesirably increases. - In order to cope with this problem, in this embodiment, a buffer member is partly notched to be divided into
parts Bent portions frame member 32 on which agrid 31 is to be mounted are placed in the gaps between the respective parts. With this arrangement, thebuffer members imaging unit 21 on the sides other than the side where ahandle 29 is formed each define the outermost shape. That is, the three sides have the same effect as that described in the first embodiment. Setting the width of thebent portions grid 31 with respect to theimaging unit 21 within a predetermined range. -
FIG. 6 shows an X-ray imaging apparatus according to still another embodiment of the present invention, which is a modification of the embodiment shown inFIG. 5 . - In the embodiment shown in
FIG. 5 , the outer shape of the imaging unit defines the outermost shape at the three sides. In this embodiment, however, a grid unit is formed such that the outer shape of an imaging unit at the four sides including the side where a handle is formed defines the outermost shape.Buffer members imaging unit 41. This arrangement allows the effect of reducing shock even when theimaging unit 41 is accidentally dropped as well as when a shock acts on theimaging unit 41 while the operator is gripping the handle and transporting theimaging unit 41. Agrid unit 50 includes alock portion 53 which is locked in a throughhole 49 formed as a handle. Thegrid unit 50 is mounted on theimaging unit 41 by holding it withbent portions lock portion 53. - As described above, a
grid frame 52 does not completely protrude from the outer shape of theimaging unit 41 when viewed from the incident surface side. This makes it possible to maintain the same effect against a shock from the side surface direction as that obtained when the imaging unit is used singly, even in a state in which thegrid unit 50 is mounted on the imaging unit. - The embodiments of the present invention have been described above. Obviously, however, the present invention is not limited to these embodiments. Various modifications and changes of the embodiments can be made within the spirit and scope of the present invention.
- Aspects of the present invention can also be realized by a computer of a system or apparatus (or devices such as a CPU or MPU) that reads out and executes a program recorded on a memory device to perform the functions of the above-described embodiment(s), and by a method, the steps of which are performed by a computer of a system or apparatus by, for example, reading out and executing a program recorded on a memory device to perform the functions of the above-described embodiment(s). For this purpose, the program is provided to the computer for example via a network or from a recording medium of various types serving as the memory device (e.g., computer-readable medium).
- While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. The scope of the following claims is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures and functions.
Claims (1)
1. A radiation imaging apparatus comprising:
a detection unit for detecting a radiation distribution transmitted through an object;
an imaging unit which includes said detection unit; and
a grid for suppressing scattered light which is detachably mounted on an outside of said imaging unit,
wherein said imaging unit includes a buffer member on a side surface facing a surface side which radiation strikes,
said grid includes a grid body placed on the surface side which the radiation strikes, and a fixing unit for fixing the grid body to said imaging unit, and
sides constituting the fixing unit include a side which does not protrude from an outer shape of said imaging unit when viewed from the surface side which the radiation strikes.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US13/413,022 US20120163555A1 (en) | 2009-04-02 | 2012-03-06 | Radiation imaging apparatus |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2009-090486 | 2009-04-02 | ||
JP2009090486A JP5451145B2 (en) | 2009-04-02 | 2009-04-02 | Radiation imaging equipment |
US12/725,544 US8160207B2 (en) | 2009-04-02 | 2010-03-17 | Radiation imaging apparatus |
US13/413,022 US20120163555A1 (en) | 2009-04-02 | 2012-03-06 | Radiation imaging apparatus |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/725,544 Continuation US8160207B2 (en) | 2009-04-02 | 2010-03-17 | Radiation imaging apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
US20120163555A1 true US20120163555A1 (en) | 2012-06-28 |
Family
ID=42826187
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/725,544 Expired - Fee Related US8160207B2 (en) | 2009-04-02 | 2010-03-17 | Radiation imaging apparatus |
US13/413,022 Abandoned US20120163555A1 (en) | 2009-04-02 | 2012-03-06 | Radiation imaging apparatus |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/725,544 Expired - Fee Related US8160207B2 (en) | 2009-04-02 | 2010-03-17 | Radiation imaging apparatus |
Country Status (2)
Country | Link |
---|---|
US (2) | US8160207B2 (en) |
JP (1) | JP5451145B2 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011050736A (en) * | 2009-08-31 | 2011-03-17 | General Electric Co <Ge> | Grid assembly positioning circuit and detector assembly including the circuit |
US11353600B2 (en) * | 2019-03-27 | 2022-06-07 | Canon Kabushiki Kaisha | Radiation imaging apparatus |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP5675062B2 (en) * | 2009-06-05 | 2015-02-25 | キヤノン株式会社 | X-ray imaging device |
JP5586878B2 (en) | 2009-06-08 | 2014-09-10 | キヤノン株式会社 | X-ray imaging device |
JP6032876B2 (en) * | 2011-09-27 | 2016-11-30 | キヤノン株式会社 | Radiography apparatus and grid unit |
JP6224901B2 (en) | 2013-03-14 | 2017-11-01 | キヤノン株式会社 | Mobile radiographic imaging apparatus, control method for mobile radiographic imaging apparatus, and program |
EP2910189B1 (en) * | 2014-02-21 | 2016-09-14 | Samsung Electronics Co., Ltd | X-ray grid structure and x-ray apparatus including the same |
JP6606388B2 (en) | 2015-09-29 | 2019-11-13 | キヤノン株式会社 | Radiography apparatus and radiation imaging system |
Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4706269A (en) * | 1985-03-11 | 1987-11-10 | Reina Leo J | Anti-scatter grid structure |
Family Cites Families (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4759131B2 (en) * | 2000-11-21 | 2011-08-31 | キヤノン株式会社 | X-ray imaging device |
US7104686B2 (en) * | 2001-05-30 | 2006-09-12 | Canon Kabushiki Kaisha | Radiographic apparatus |
JP2003000586A (en) * | 2001-06-18 | 2003-01-07 | Canon Inc | Grid attaching structure for electronic cassette for x- ray image recording |
JP2004177251A (en) * | 2002-11-27 | 2004-06-24 | Canon Inc | Radiographic imaging device |
JP2005006806A (en) * | 2003-06-18 | 2005-01-13 | Canon Inc | X-ray radiographic equipment |
JP2006006424A (en) * | 2004-06-23 | 2006-01-12 | Canon Inc | X-ray radiographic equipment |
JP5273957B2 (en) * | 2007-07-03 | 2013-08-28 | キヤノン株式会社 | Radiation imaging equipment |
-
2009
- 2009-04-02 JP JP2009090486A patent/JP5451145B2/en not_active Expired - Fee Related
-
2010
- 2010-03-17 US US12/725,544 patent/US8160207B2/en not_active Expired - Fee Related
-
2012
- 2012-03-06 US US13/413,022 patent/US20120163555A1/en not_active Abandoned
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4706269A (en) * | 1985-03-11 | 1987-11-10 | Reina Leo J | Anti-scatter grid structure |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2011050736A (en) * | 2009-08-31 | 2011-03-17 | General Electric Co <Ge> | Grid assembly positioning circuit and detector assembly including the circuit |
US11353600B2 (en) * | 2019-03-27 | 2022-06-07 | Canon Kabushiki Kaisha | Radiation imaging apparatus |
Also Published As
Publication number | Publication date |
---|---|
JP5451145B2 (en) | 2014-03-26 |
JP2010243264A (en) | 2010-10-28 |
US20100254517A1 (en) | 2010-10-07 |
US8160207B2 (en) | 2012-04-17 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US8160207B2 (en) | Radiation imaging apparatus | |
KR101362244B1 (en) | Radiographic apparatus | |
JP3848288B2 (en) | Radiation imaging equipment | |
US7104686B2 (en) | Radiographic apparatus | |
JP5908668B2 (en) | Portable radiography system | |
JP2004177251A (en) | Radiographic imaging device | |
US20130077760A1 (en) | Radiation imaging apparatus and detachable grid unit for same | |
JP2005006806A (en) | X-ray radiographic equipment | |
JP2013253887A (en) | Radiographic device, radiographic system | |
CN105662442B (en) | radiation imaging system | |
JP2002143138A (en) | Cassette type x-ray picture image radiographic equipment | |
JP6472432B2 (en) | Radiation imaging system | |
JP2013011553A (en) | Radiographic system, radiographic apparatus and radiographic method | |
JP3848107B2 (en) | Radiation imaging equipment | |
JP4759131B2 (en) | X-ray imaging device | |
JP5597291B2 (en) | Grid, imaging device and radiographic imaging device | |
JP6071986B2 (en) | Radiation imaging system | |
JP4208907B2 (en) | Radiation imaging equipment | |
JP2006058366A (en) | Radiographic imaging device | |
JP2019069269A (en) | Radiation imaging system | |
CN116491964A (en) | Radiation imaging apparatus and radiography system | |
WO2019069824A1 (en) | Radiation detection unit, radiation detection device, and radiation detection system | |
JP2005017513A (en) | Radiographic imaging apparatus |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |