JP6686207B2 - Electronic cassette - Google Patents

Description

  The present invention relates to an electronic cassette used for radiography.

  Electronic cassettes are widely used in medical radiography, such as X-ray photography. An electronic cassette includes an image detection unit (flat panel detector (FPD; flat panel detector (FPD)) that detects an X-ray image of a subject such as a patient in a housing having a front surface on which X-rays are incident, a rear surface facing the front surface, and four side surfaces. It is also a portable X-ray image detection device.

  As described in FIG. 1 of Patent Document 1, the electronic cassette is held upright or lying down so that the X-ray source for irradiating the X-ray and the front surface of the housing are held in an opposite posture. It is detachably set in the holder. The holder has a front plate portion and a back plate portion that cover the front surface and the back surface of the housing, and is made of a conductive material having an electromagnetic wave shielding property.

  Further, in X-ray imaging, scattered rays are generated when the X-rays pass through the subject, and therefore a grid for removing the scattered rays may be used. The grid includes an external type (hereinafter referred to as an external grid) that is detachably attached to the electronic cassette (see Patent Documents 2 and 3). The external grid is not for the electronic cassette to be set in the holder of the stand-up radiography table or the recumbent radiography table, but for a subject lying on the bed or a subject that cannot move by itself such as the elderly or sudden illness. Attached to an electronic cassette when used in.

  The external grid is composed of a grid body and a holding frame that holds the grid body. The holding frame, to which the grid main body is attached, is provided on the top plate portion that covers the front surface of the housing and the edge of the top plate portion. It has a side plate portion to cover it, and is formed of a conductive material having an electromagnetic wave shielding property like the holder of the photographing table.

  The electronic cassette includes a wireless communication unit that wirelessly communicates with an external device such as a control device that controls the operation of the electronic cassette, and a battery that supplies power for driving the electronic cassette, and is used without being called a cable. There are things that are possible. For example, Patent Document 4 describes an electronic cassette in which an antenna of a wireless communication unit is provided on the surface of the image detection unit opposite to the X-ray incidence surface in the housing.

  In order to prevent electromagnetic noise from entering the electronic cassette and radiating electromagnetic noise from the electronic cassette to the outside, the housing is made of a conductive material that has the same electromagnetic shielding properties as the holder of the photographing table and the holding frame of the external grid. Is formed by. Therefore, in Patent Document 4 in which the antenna is arranged in the housing, an antenna opening for transmitting the radio waves is formed on the back surface or the side surface of the housing, so that the antenna can transmit and receive the radio waves. In Patent Document 1, a cover having radio wave transmission is attached to the antenna opening.

JP, 2014-057831, A Utility model registration No. 3137548 Utility model registration No. 3144690 JP, 2011-112923, A

  However, when the antenna opening is formed on the back surface or the side surface of the housing as in Patent Document 1, there are the following problems.

  First, when the antenna opening is formed on the back surface of the housing, when the electronic cassette is set in the holder of the imaging stand, the back plate portion of the holder having electromagnetic wave shielding does not cover the antenna opening on the back surface. There was something that happened. When the antenna opening is formed on the side surface of the housing, when the external grid is attached to the housing, the side antenna opening of the holding frame having the electromagnetic wave shielding property may close the antenna opening on the side surface. there were.

  If the antenna opening is blocked by a member that has an electromagnetic wave shielding property such as a holder for the shooting table or an external grid, the radio wave transmission becomes poor, the wireless communication speed becomes slow, and sometimes the wireless communication is interrupted. Then, stable wireless communication cannot be performed.

  If the antenna opening is formed on the front surface of the housing instead of the back or side surface, the front surface of the housing is the front plate part of the holder of the shooting table or the top plate part of the external grid as well as the back and side surfaces. Since it is blocked, it is not suitable as a place for disposing the antenna opening as well as the back and side faces.

  In this way, when the location of the antenna opening is on the side, back, or front of the housing, in either case, use environment such as setting in the holder of the imaging stand or attaching an external grid. Depending on the situation, stable wireless communication may not be possible.

  Here, when the antenna opening is blocked by a member having an electromagnetic wave shielding property such as a holder of the imaging table or an external grid, the part of the member that closes the antenna opening may be cut off in the same manner as the antenna opening. If a process such as making a hole is made, the radio wave transparency is improved, but the process is troublesome and the strength of the member may be impaired in some cases.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide an electronic cassette capable of performing stable wireless communication regardless of the use environment.

  In order to achieve the above object, an electronic cassette of the present invention includes an image detection unit that detects a radiation image of a subject based on the radiation that has passed through the subject, and an image detection unit that accommodates the front face and the front face that the radiation enters. A housing having at least one rear surface and four side surfaces, the housing having at least one of the side surfaces and an inclined surface inclined with respect to the rear surface, and a housing disposed in the housing, The antenna includes an antenna for wirelessly transmitting a radiographic image by radio waves, and an antenna opening formed at least in part on the inclined surface for transmitting radio waves.

  The antenna is preferably arranged at a position facing the antenna opening.

  It is preferable to provide a cover that closes the antenna opening.

  The width of the inclined surface, which is the distance between the first boundary that is the boundary between the side surface and the inclined surface and the second boundary that is the boundary between the back surface and the inclined surface, is the side surface in the thickness direction of the housing that is orthogonal to the front surface and the back surface. It is preferable that the width is larger than the width.

  It is preferable that it can be detachably set on the holder of the photographing table. The holder preferably has a front plate portion that covers the front surface and a back plate portion that faces the front plate portion and covers the back surface.

  Further, it is preferable that an external grid for removing scattered rays generated when the radiation passes through the subject is detachably attachable. The external grid preferably has a top plate portion that covers the front surface, and a side plate portion that is provided at an edge of the top plate portion and that extends from the front surface side to the back surface and covers a part of the side surface.

  According to the present invention, since the antenna opening is provided on the inclined surface that is inclined with respect to the side surface and the back surface of the housing, the antenna opening is not blocked by the holder of the imaging table or the external grid. Therefore, it is possible to provide an electronic cassette capable of performing stable wireless communication regardless of the use environment.

It is an appearance perspective view of the electronic cassette seen from the front side. It is an appearance perspective view of the electronic cassette seen from the back side. It is an appearance top view of a standing position imaging stand and a lying position imaging stand. It is an appearance perspective view showing an external grid and an electronic cassette. FIG. 3 is an external perspective view showing the periphery of a wireless communication unit. It is sectional drawing of the electronic cassette which follows the AA line of FIG. It is a figure which shows the width of an inclined surface and a side surface. It is a figure which shows the propagation path of the electric wave when an electronic cassette is set to the holder of the upright imaging stand and the lying down imaging stand. It is a figure which shows the comparative example which formed the opening part for antennas in the side surface. It is a figure which shows the example in which the antenna is not facing the opening for antennas.

  1 and 2, the electronic cassette 10 is used, for example, for medical X-ray imaging, and image detection for detecting an X-ray image of the subject H based on X-rays transmitted through the subject H (see FIG. 3). It is composed of a unit 15 and a portable housing 16 that houses the image detection unit 15.

  As is well known, the image detection unit 15 includes a scintillator (phosphor) that converts incident X-rays into visible light, and a TFT (Thin Film Transistor) that has a plurality of pixels that accumulate charges according to visible light from the scintillator. ) An active matrix substrate is provided. In the housing 16, in addition to the image detection unit 15, a gate driver that applies a gate pulse to the gate of the TFT to switch the TFT, converts charges accumulated in the pixel into a voltage signal representing an X-ray image. A signal processing circuit for outputting, a gate driver, a control unit for controlling driving of the signal processing circuit, and the like are built in.

  The housing 16 has a rectangular parallelepiped shape including a front surface 20 on which X-rays are incident, a rear surface 21 facing the front surface 20, and four side surfaces 22, 23, 24, 25. The housing 16 is formed of a conductive material such as metal (aluminum, magnesium and alloys thereof) or carbon that shields electromagnetic waves, intrusion of electromagnetic noise into the electronic cassette 10, and electromagnetic interference from the electronic cassette 10 to the outside. It also functions as an electromagnetic shield that prevents the emission of noise. The housing 16 has a size in conformity with the international standard ISO (International Organization for Standardization) 4090: 2001, which is substantially the same as, for example, a film cassette, an IP (Imaging Plate) cassette, or a CR (Computed Radiography) cassette.

  A rectangular opening is formed in the front surface 20, and a transmission plate 26 is attached to the opening. A protective film 27 (see FIG. 6) made of resin that transmits X-rays is attached to the surface of the transmission plate 26. As a result, the front surface 20 becomes a flat surface. The transmission plate 26 is made of a carbon material that is lightweight, has high rigidity, and has high X-ray transparency. Further, an indicator 28 such as an LED (Light Emitting Diode) for reporting the power on / off of the electronic cassette 10 is provided on the front surface 20 on the side surface 22 side.

  The housing 16 has a built-in wireless communication unit 30 that wirelessly communicates various information such as an X-ray image with a control device (not shown) that controls the operation of the electronic cassette 10. Two wireless communication units 30 are provided, one for each of the corner portions 31 where the side surfaces 23 and the side surfaces 24 intersect and one for the corner portions 32 where the diagonal side surfaces 22 and the side surfaces 25 of the corner portions 31 intersect. . Therefore, even if the wireless communication of one of the two wireless communication units 30 fails, the wireless communication can be performed if the other wireless communication is stable.

  When the wireless communication unit 30 is used, the electronic cassette 10 can be driven by electric power from the battery 33 and can be used in a so-called cableless manner. Since the two wireless communication units 30 are different in arrangement position and have the same other configurations and actions, only the wireless communication unit 30 provided in the corner portion 31 will be described below.

  Further, the electronic cassette 10 includes a female connector 34 as a function for wired communication with the control device. A male connector 35 is connected to the female connector 34. To the male connector 35, one end of a cable 36 for connecting the electronic cassette 10 and the control device by wire is connected. The other end of the cable 36 is connected to a connector (not shown) that connects to the control device. The female connector 34 is covered and protected by a lid 37 when the male connector 35 is not connected, such as during use of the wireless communication function.

  The electronic cassette 10 receives not only various information but also electric power from the control device via the female connector 34. When the female connector 34 and the male connector 35 are connected, the electronic cassette 10 is driven by the electric power from the control device. It is also possible to charge the battery 33 with electric power from the control device.

  A battery mounting portion 38 is provided at the center of the back surface 21. A battery 33 that supplies electric power for driving the electronic cassette 10 is detachably attached to the battery attachment portion 38. FIG. 2 shows a state in which the battery 33 is mounted on the battery mounting portion 38.

  The battery mounting portion 38 is a recess in which the back surface 21 is recessed toward the front surface 20. The battery mounting portion 38 is formed in the same shape and size as the planar shape and the planar size of the battery 33 so that the battery 33 can be housed without a gap. The depth of the battery mounting portion 38 from the back surface 21 is also substantially the same as the thickness of the battery 33. Therefore, in the state where the battery 33 is mounted on the battery mounting portion 38, the upper surface of the battery 33 is exposed from the rear surface 21, and the upper surface and the rear surface 21 of the battery 33 are flush with each other.

  As shown in FIG. 3, in the electronic cassette 10, the holder 47A of the standing imaging stand 46A and the holder of the recumbent imaging stand 46B are held so that the X-ray source 45 for irradiating the X-rays and the front surface 20 are held in a posture to face each other. It is detachably set to 47B. FIG. 3 shows a state in which the electronic cassette 10 is set on the holder 47A of the upright imaging stand 46A to perform imaging.

  The holders 47A and 47B are made of a conductive material having an electromagnetic wave shielding property such as aluminum and stainless steel, and have front plate portions 48A and 48B that cover the front surface 20 and a back surface that faces the front plate portions 48A and 48B and covers the back surface 21. It has plate parts 49A and 49B and side plate parts 50A and 50B that cover the side faces 22 to 24 of the four side faces 22 to 25 except the side face 25 on which the female connector 34 is provided. Since the side surface 25 provided with the female connector 34 is exposed to the outside, the female connector 34 and the male connector 35 can be connected with the electronic cassette 10 set in the holders 47A and 47B.

  In addition to the electronic cassette 10 being set in the holder 47A of the standing radiography table 46A and the holder 47B of the recumbent radiography table 46B, the subject H lying on the bed, or the subject who cannot move by himself or herself such as the elderly or sudden illness. It may be used alone for H. Further, when the housing 16 is substantially the same size as the film cassette, the IP cassette, or the CR cassette, the electronic cassette 10 can be attached to the existing imaging stand for these cassettes.

  In X-ray photography, scattered rays are generated when the X-rays pass through the subject H. Therefore, in order to remove the scattered rays, when the electronic cassette 10 is used alone, the external grid 55 shown in FIG. May be used. The external grid 55 is detachably attached to the outside of the housing 16. The external grid 55 includes a rectangular grid body 56 and a holding frame 57 that holds the grid body 56. The grid body 56 has a size slightly larger than the transmission plate 26 so as to cover the entire transmission plate 26 when the external grid 55 is attached to the housing 16. The holding frame 57 is made of a conductive material having an electromagnetic wave shielding property such as aluminum or stainless steel, and has a size slightly larger than the housing 16.

  The holding frame 57 has a top plate portion 58 and a side plate portion 59. The top plate portion 58 is formed with a rectangular opening to which the grid main body 56 is attached. The top plate portion 58 covers the front surface 20 with the grid main body 56 when the external grid 55 is attached to the housing 16. The side plate portion 59 is provided at the edge of the top plate portion 58 and extends from the front surface 20 side to the back surface 21 side. Although not shown, the holding frame 57 is provided with a known fall prevention / release mechanism for fixing the external grid 55 to the housing 16 to prevent the external grid 55 from falling off and to release it. Has been.

  In FIG. 5 showing the periphery of the wireless communication unit 30 and FIG. 6 which is a cross-sectional view of the housing 16 taken along the line AA of FIG. 5, a side surface 23 and a rear surface 21 are provided between the side surface 23 and the rear surface 21. An inclined surface 65 that is inclined with respect to it is formed. An antenna opening 66 for transmitting radio waves is formed on the inclined surface 65.

  The antenna opening 66 has a rectangular shape when viewed from the direction D. An edge 74 for receiving the cover 73 is formed on the inner peripheral surface of the antenna opening 66. The edge portion 74 regulates the mounting position of the cover 73 in the insertion direction of the cover 73 into the antenna opening 66.

  The wireless communication unit 30 has an antenna 75 and an oscillation circuit (not shown). The wireless communication unit 30 is attached inside the housing 16 to, for example, a base on which the image detection unit 15 is installed. The antenna 75 of the wireless communication unit 30 emits a radio wave EW toward the control device and receives the radio wave EW from the control device. The radio wave EW emitted from the antenna 75 is emitted to the outside of the housing 16 through the antenna opening 66. Further, the radio wave EW from the control device enters the inside of the housing 16 through the antenna opening 66.

  The antenna 75 is arranged at a position facing the antenna opening 66. More specifically, the antenna 75 is located substantially at the center of the antenna opening 66, and the installation surface 30A of the antenna 75 of the wireless communication unit 30 is arranged substantially parallel to the inclined surface 65.

  The cover 73 is formed of a non-conductive material such as resin having radio wave transmission. The cover 73 has the same shape and the same size as the antenna opening 66, and is fitted into the antenna opening 66 without a gap. In the state shown in FIG. 6 in which the cover 73 is fitted in the antenna opening 66, the upper surface of the cover 73 and the inclined surface 65 are flush with each other. The cover 73 and the antenna opening 66 are fixed to each other with an adhesive, for example. The antenna opening 66 is watertightly and airtightly closed by the cover 73.

  The side plate portion 59 of the external grid 55 is provided in order to facilitate the positioning of the external grid 55 to the housing 16, for example, as shown by a chain double-dashed line in FIG. 1 boundary 85, see FIG. 7). Therefore, when the external grid 55 is attached to the housing 16, the side surface 23 is covered with the side plate portion 59.

  Reference numeral 80 is an inclined surface formed between the side surface 23 and the front surface 20 like the inclined surface 65. The inclined surfaces 65 and 80 are formed as curved surfaces that are convex toward the outside of the housing 16. Although illustration is omitted, the inclined surface 65 is also formed between the side surfaces 22, 24, 25 other than the side surface 23 and the back surface 21, and the inclined surface 80 is also formed between the side surfaces 22, 24, 25 and the front surface 20. Are formed.

  In FIG. 7, the width W1 of the inclined surface 65 is formed wider than the width W2 of the side surface 23 in the direction D. The width W1 of the inclined surface 65 is the distance between the first boundary 85 that is the boundary between the side surface 23 and the inclined surface 65 and the second boundary 86 that is the boundary between the back surface 21 and the inclined surface 65. In addition, the width W2 of the side surface 22 is, in other words, the distance between the first boundary 85 and the third boundary 87 which is the boundary between the side surface 22 and the inclined surface 80. Similarly, with respect to the side surfaces 22, 24 and 25, the width W1 of the inclined surface 65 is wider than the width of the side surfaces 22, 24 and 25.

  Next, the operation of the above configuration will be described. First, when performing X-ray photography, as shown in FIG. 3, the electronic cassette 10 holds the X-ray source 45 and the front surface 20 in a position facing each other so that the X-ray source 45 and the front surface 20 face each other. It is set on the holder 47B of the photographing table 46B. In this case, the back surface 21 is covered with the back plate portions 49A and 49B of the holders 47A and 47B as shown in FIG. Therefore, if the antenna opening 66 is formed on the back surface 21, the antenna opening 66 is closed by the back plate portions 49A and 49B. When the antenna opening 66 is closed by the back plates 49A and 49B, the emission of the radio wave EW from the antenna opening 66 or the incidence of the radio wave EW into the antenna opening 66 is blocked, and stable wireless communication is achieved. Will not be able to do.

  However, in the present embodiment, since the housing 16 is provided with the inclined surface 65 inclined with respect to the side surface 23 and the back surface 21, and the antenna opening 66 is formed in the inclined surface 65, the back plate portion 49A, The antenna opening 66 is not blocked by 49B. In other words, a sufficient gap is secured between the inclined surface 65 and the back plate portions 49A and 49B for the radio wave EW to be emitted or incident.

  The radio wave EW emitted from the antenna 75 is emitted to the outside of the housing 16 through the antenna opening 66, travels through the gap between the inclined surface 65 and the back plate portions 49A and 49B, and reaches the back plate portions 49A and 49B. To reach. The radio wave EW reaching the back plates 49A and 49B is emitted to the outside of the holders 47A and 47B while being reflected several times by the back plates 49A and 49B and the housing 16. The radio wave EW from the control device follows the path opposite to the radio wave EW emitted from the antenna 75, enters the housing 16 through the antenna opening 66, and is received by the antenna 75. Therefore, even when the electronic cassette 10 is set in the holder 47A of the standing position imaging table 46A or the holder 47B of the lying position imaging table 46B, stable wireless communication can be performed.

  In addition, even when the electronic cassette 10 is inserted between the subject H lying on the bed and the bed for X-ray imaging, a sufficient gap is secured between the inclined surface 65 and the bed so that the radio wave EW is emitted or incident. Therefore, there is a similar effect.

  In X-ray photography in which the electronic cassette 10 is used alone, an external grid 55 is attached to the housing 16 in order to remove scattered rays generated when the subject H is transmitted.

  Here, consider the case where the antenna opening 90 is formed on the side surface 23 as in the comparative example shown in FIG. The antenna opening 90 is closed by a cover 91. Further, the antenna 75 is arranged at a position facing the antenna opening 90.

  In this case, for example, when the external grid 55 having the side plate portion 59 having a length of about the first boundary 85 shown by the two-dot chain line in FIG. 6 is attached to the housing 16, the side plate portion 59 causes the antenna opening 90. Will be blocked. Therefore, similarly to the case where the antenna opening 66 is closed by the back plate portions 49A and 49B, the side plate portion 59 also blocks the emission and incidence of the radio wave EW in this case, so that stable wireless communication can be performed. become unable.

  However, in the present embodiment, since the antenna opening 66 is formed on the inclined surface 65 instead of the side surface 23, the side plate 59 does not block the antenna opening 66 as shown in FIG. . Therefore, stable wireless communication can be performed even when the external grid 55 is attached to the electronic cassette 10.

  As described above, the back plate portions 49A and 49B that close the antenna opening 66 and the side plate portion 59 are not required to be cut or punched, and the holder 47A of the upright position image capturing table 46A and the lying position image capturing table are not required. It is possible to perform stable wireless communication regardless of the usage environment such as setting the electronic cassette 10 in the holder 47B of 46B or attaching the external grid 55 to the electronic cassette 10.

  For this reason, it is not necessary to provide a large number of wireless communication units 30 for insurance so that wireless communication can be performed by another wireless communication unit even if the wireless communication of one wireless communication unit fails. The number of communication units 30 can be reduced to about two.

  Further, when the antenna opening 90 is formed on the side surface 23 as in the comparative example of FIG. 9, the strength of the side surface 23 becomes weaker than when the antenna opening 90 is not formed. When the electronic cassette 10 is inserted between the subject H lying on the bed and the bed and X-ray photography is performed, the load of the subject H is concentrated on the side face 23 parallel to the direction D, so that the strength of the side face 23 is increased. I can't help if I'm weak. On the other hand, if the strength of the side surface 23 is secured, even if the strength of the inclined surface 65 is weakened by forming the antenna opening 66 in the inclined surface 65, X-ray imaging can be performed without hesitation.

  Further, if the strength of the side surface 23 is ensured, even if the electronic cassette 10 is accidentally dropped, it is unlikely to break down. This is because many causes of failure when the electronic cassette 10 is dropped are when the electronic cassette 10 is dropped from the side surface 23 or the corner of the housing 16 and the side surface 23 is subjected to force. Therefore, if the strength of the side surface 23 is ensured, it is possible to prevent a failure at the time of dropping.

  Since the antenna opening 66 is closed by the cover 73, the inclined surface 65 becomes a flat surface, and the antenna opening 66 is caught on the bed when the electronic cassette 10 is inserted between the subject H lying on the bed and the bed. Does not interfere with work.

  Since the antenna 75 is arranged at a position facing the antenna opening 66, the transmission / reception efficiency of the radio wave EW can be further improved. Further, since the width W1 of the inclined surface 65 is made wider than the width W2 of the side surface 23, compared with the case where the antenna opening 90 is formed on the side surface 23 as in the comparative example of FIG. 9, the antenna opening 66 is formed. Can have a large opening area, and can further improve the transmission / reception efficiency of the radio wave EW.

  By providing the inclined surfaces 65 and 80, the front surface 20, the back surface 21, and the side surfaces 22 to 25 are connected by a smooth curved surface without corners. Therefore, the sense of contact of the housing 16 with the subject H becomes soft. Further, when the electronic cassette 10 is placed on a flat surface, it is possible to easily lift the electronic cassette 10 by placing the fingers on the inclined surfaces 65 and 80. Further, the electronic cassette 10 can be smoothly inserted between the subject H lying on the bed and the bed.

  The arrangement position of the antenna 75 is not limited to the position facing the antenna opening 66 of the above embodiment. For example, as shown in FIG. 10, the wireless communication unit 30 may be provided at a recessed position on the back surface 21 side, and the antenna 75 may be disposed at a position away from the antenna opening 66.

  The antenna opening 66 may extend not only to the inclined surface 65 but also to the back surface 21 and the side surface 23.

  The shape of the antenna opening 66 is not limited to the rectangular shape as in the above embodiment, but may be circular or elliptical. The antenna 75 may have at least a function of wirelessly transmitting the X-ray image to the control device. Further, the wireless communication unit 30 is not limited to the integrated antenna 75, the oscillation circuit, and the like illustrated in the above embodiment, and the antenna 75 and the oscillation circuit and the like may be provided separately.

  In the above embodiment, the inclined surface 65 is provided between the four side surfaces 22 to 25 and the back surface 21, but the inclined surface 65 is provided at least between the side surface where the wireless communication unit 30 is provided and the back surface 21. Just do it.

  The side plate portion of the external grid may not be provided on all of the side surfaces 22 to 25. For example, you may use the external grid which provided the side plate part only in the part which opposes the side surfaces 22 and 23. Further, the inclined surfaces 65 and 80 are not limited to curved surfaces that are convex toward the outside of the housing 16 as in the above-described embodiment, and may be flat surfaces or may have a shape in which curved surfaces and flat surfaces are combined.

  As the image detection unit, a direct conversion type using a conversion layer (amorphous selenium or the like) that directly converts X-rays into electric charges may be used without using a scintillator. Further, although the TFT type image detection unit is illustrated, a CMOS (Complementary Metal Oxide Semiconductor) type image detection unit may be used. Furthermore, the present invention is not limited to X-rays, but can be applied to electronic cassettes that image based on other radiation such as γ-rays.

10 electronic cassette 15 image detection unit 16 housing 20 front face 21 back face 22 to 25 side face 30 wireless communication unit 46A, 46B standing upright photography table, lying down photography table 47A, 47B holder 48A, 48B front plate section 49A, 49B back plate section 55 External grid 58 Top plate part 59 Side plate part 65 Inclined surface 66, 90 Antenna opening 73, 91 Cover 75 Antenna 85, 86 First boundary, second boundary EW radio wave W1 Inclined surface width W2 Side surface width

Claims (16)

An image detection unit that detects a radiation image of the subject based on the radiation that has passed through the subject,
A housing that houses the image detection unit and has a front surface on which the radiation is incident, a back surface facing the front surface, and four side surfaces, and is inclined with respect to at least a part of the side surfaces and at least a part of the back surface. A housing having an inclined portion, one end of the inclined portion is in contact with the side surface, and the other end of the inclined portion opposite to the one end is in contact with the back surface;
An antenna arranged in the housing for transmitting at least the radiographic image by radio waves,
A battery mounting portion in which a battery for supplying electric power is mounted, which is a recessed portion in which the back surface is recessed toward the front surface,
An electronic cassette, wherein at least a part of the inclined portion is formed, and an antenna opening for transmitting the radio wave is provided.   The electronic cassette according to claim 1, wherein the radio waves are transmitted and received through the inclined portion.   The electronic cassette according to claim 1, wherein the antenna is arranged at a position facing the opening for the antenna.   The electronic cassette according to claim 3, wherein the antenna is located at a center of the antenna opening, and is arranged such that an installation surface is parallel to the inclined portion.   The electronic cassette according to claim 3 or 4, wherein an opening area of the antenna opening is larger than an area of a surface of the antenna facing the antenna opening.   The electronic cassette according to claim 1, wherein the antenna is arranged at a position deviated from a position facing the opening for the antenna.   7. The electronic cassette according to claim 1, wherein the antenna is arranged with a gap between the antenna and the opening for the antenna.   The electronic cassette according to claim 1, wherein the antenna opening has any one of a rectangular shape, a circular shape, and an elliptical shape.   9. The electronic cassette according to claim 1, wherein an opening area of the antenna opening is smaller than an area of the inclined portion.   The electronic cassette according to claim 1, further comprising a cover that closes the antenna opening.   The electronic cassette according to claim 10, wherein the cover is formed of a non-conductive material having radio wave transmission.   A width of the inclined portion that is a distance between a first boundary that is a boundary between the side surface and the inclined portion and a second boundary that is a boundary between the back surface and the inclined portion is orthogonal to the front surface and the back surface. The electronic cassette according to claim 1, wherein the electronic cassette is wider than the width of the side surface in the thickness direction of the housing.   The electronic cassette according to any one of claims 1 to 12, which is detachably settable on a holder of an imaging table. The holder has a front plate portion that covers the front surface,
The electronic cassette according to claim 13, further comprising a back plate portion that faces the front plate portion and covers the back surface.   The electronic cassette according to any one of claims 1 to 14, wherein an external grid that removes scattered radiation generated when the radiation passes through the subject is removably attachable. The external grid, a top plate portion that covers the front surface,
The electronic cassette according to claim 15, further comprising: a side plate portion that is provided at an edge of the top plate portion, extends from the front surface side to the back surface side, and covers a part of the side surface.

Images