JP6961743B2 - 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. The electronic cassette is an image detection unit (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 back surface facing the front surface, and four side surfaces. It is a portable X-ray image detection device that houses a detector).

As described in FIG. 1 of Patent Document 1, the electronic cassette is a standing or lying position photographing table so that the X-ray source for irradiating X-rays and the front surface of the housing are held in a facing posture. It is detachably set in the holder of. 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 electromagnetic wave shielding properties.

Further, in X-ray photography, since scattered rays are generated when the X-rays pass through the subject, a grid for removing the scattered rays may be used. The grid includes an external type (hereinafter referred to as an external grid) that can be detachably attached to an electronic cassette (see Patent Documents 2 and 3). The external grid is a single unit for subjects who are lying on the bed or who cannot move by themselves, such as the elderly and suddenly ill, instead of having the electronic cassette set on the holder of the standing or lying position. Attached to the electronic cassette when used in.

The external grid is composed of a grid body and a holding frame for holding the grid body. The holding frame is provided on the top plate portion that covers the front surface of the housing and the edge of the top plate portion to which the grid body is attached, and extends from the front side to the back side of the housing to cover a part of the side surface of the housing. It has a side plate portion that covers it, and is made of a conductive material that has electromagnetic wave shielding properties like the holder of the photographing table.

The electronic cassette is equipped with 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 electric power for driving the electronic cassette, and is used without a cable. There is something that can be done. For example, Patent Document 4 describes an electronic cassette in which an antenna of a wireless communication unit is provided on a surface of an image detection unit opposite to an incident surface of X-rays.

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

Japanese Unexamined Patent Publication No. 2014-057831 Utility model registration No. 3137548 Utility model registration No. 3144690 Japanese Unexamined Patent Publication No. 2011-112923

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 of the housing, when the electronic cassette is set on the holder of the photographing table, the antenna opening on the back is blocked by the back plate of the holder having electromagnetic wave shielding properties. There was a case. When the antenna opening is formed on the side surface of the housing, when the external grid is attached to the housing, the side plate of the holding frame having electromagnetic wave shielding property may block the antenna opening on the side surface. there were.

If the opening for the antenna is blocked by a member that has electromagnetic wave shielding properties such as a holder for the shooting table or an external grid, the radio wave transmission will deteriorate, the wireless communication speed will slow down, and sometimes the wireless communication will be interrupted. Therefore, 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 should be the front plate of the holder of the shooting table or the top plate of the external grid in the same way as the back or side. As with the back and sides, it is not an appropriate location for the antenna opening because it will be blocked.

In this way, when the antenna opening is arranged on the side, back, or front of the housing, the usage environment such as setting it on the holder of the shooting table or attaching an external grid in any case. Depending on the situation, stable wireless communication may not be possible.

Here, when the antenna opening is closed by a member having electromagnetic wave shielding properties such as a holder of a photographing table or an external grid, the portion of the member that closes the antenna opening may be cut off in the same manner as the antenna opening. If processing such as making a hole is performed, the radio wave transmission is improved, but the processing is troublesome, and in some cases, the strength of the member may be impaired.

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 usage environment.

In order to achieve the above object, the electronic cassette of the present invention accommodates an image detection unit that detects a radiation image of a subject based on the radiation transmitted through the subject and an image detection unit, and faces the front surface and the front surface where the radiation is incident. A housing having a back surface and four side surfaces, which is formed between at least one of the side surfaces and the back surface and has an inclined surface inclined with respect to the side surface and the back surface, and is arranged in the housing and at least. It includes an antenna for wirelessly transmitting a radiographic image by radio waves, and an opening for an antenna for transmitting radio waves, at least a part of which is formed on an inclined surface.

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

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

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

It is preferable that it can be detachably set on the holder of the shooting 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 plate portion.

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

According to the present invention, since the antenna opening is provided on the inclined surface 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 photographing table or the external grid. Therefore, it is possible to provide an electronic cassette capable of performing stable wireless communication regardless of the usage environment.

It is the external perspective view of the electronic cassette seen from the front side. It is the external perspective view of the electronic cassette seen from the back side. It is an external plan view of the standing position photographing table and the lying position photographing table. FIG. 3 is an external perspective view showing an external grid and an electronic cassette. It is an external perspective view which shows the periphery of a wireless communication part. It is sectional drawing of the electronic cassette along the line AA of FIG. It is a figure which shows the width of the inclined surface and the side surface. It is a figure which shows the propagation path of the radio wave when the electronic cassette is set in the holder of the standing position photographing table and the lying position photographing table. It is a figure which shows the comparative example which formed the opening for an antenna on the side surface. It is a figure which shows the example which the antenna does not face the opening for an antenna.

In FIGS. 1 and 2, the electronic cassette 10 is used for medical X-ray photography, for example, and is an image detection that detects an X-ray image of the subject H based on the 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 has a scintillator (fluorescent body) 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 the visible light from the scintillator. ) Equipped with an active matrix substrate. In addition to the image detection unit 15, the housing 16 has a gate driver that applies a gate pulse to the gate of the TFT to switch the TFT, and converts the charge accumulated in the pixels into a voltage signal representing an X-ray image. It has a built-in signal processing circuit that outputs, a gate driver, a control unit that controls the drive of the signal processing circuit, and the like.

The housing 16 has a rectangular parallelepiped shape composed of a front surface 20 on which X-rays are incident, a back surface 21 facing the front surface 20, and four side surfaces 22, 23, 24, and 25. The housing 16 is formed of, for example, a metal (aluminum, magnesium, an alloy thereof, etc.) that shields electromagnetic waves or a conductive material such as carbon, so that electromagnetic noise enters the electronic cassette 10 and electromagnetic waves 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 conforming to 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, and 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 resin protective film 27 (see FIG. 6) 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, on the front surface 20 on the side surface 22 side, an indicator 28 such as an LED (Light Emitting Diode) for notifying the power on / off of the electronic cassette 10 is provided.

The housing 16 contains a control device (not shown) that controls the operation of the electronic cassette 10 and a wireless communication unit 30 that wirelessly communicates various information such as X-ray images. Two wireless communication units 30 are provided, one at a corner portion 31 where the side surface 23 and the side surface 24 intersect, and one at the corner portion 32 where the diagonal side surface 22 and the side surface 25 of the corner portion 31 intersect. .. Therefore, even if the wireless communication of one of the two wireless communication units 30 is malfunctioning, the wireless communication can be performed as long as the wireless communication of the other is stable.

When the wireless communication unit 30 is used, the electronic cassette 10 is driven by the electric power from the battery 33 and can be used without a so-called cable. Since the two wireless communication units 30 have the same configuration and operation except for the arrangement position, only the wireless communication unit 30 provided at the corner portion 31 will be described below.

Further, the electronic cassette 10 includes a female connector 34 as a function for wire communication with the control device. A male connector 35 is connected to the female connector 34. One end of a cable 36 for wiredly connecting the electronic cassette 10 and the control device is connected to the male connector 35. 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 with a lid 37 to protect the female connector 34 when the male connector 35 is not connected, such as when the wireless communication function is in use.

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 the electric power from the control device.

A battery mounting portion 38 is provided in the central portion of the back surface 21. A battery 33 that supplies electric power for driving the electronic cassette 10 is detachably mounted on the battery mounting 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 to have the same shape and size as the plane shape and plane size of the battery 33 so that the battery 33 can be accommodated substantially without gaps. 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 illustrated state in which the battery 33 is mounted on the battery mounting portion 38, the upper surface of the battery 33 is exposed from the back surface 21, and the upper surface and the back surface 21 of the battery 33 are flush with each other.

As shown in FIG. 3, the electronic cassette 10 is held in a posture in which the X-ray source 45 for irradiating X-rays and the front surface 20 face each other. Detachable set on 47B. FIG. 3 shows a state in which the electronic cassette 10 is set in the holder 47A of the standing shooting table 46A to perform shooting.

The holders 47A and 47B are made of a conductive material having electromagnetic wave shielding properties such as aluminum and stainless steel, and the front plate portions 48A and 48B covering the front surface 20 and the back plates facing the front plate portions 48A and 48B and covering the back surface 21. It has plate portions 49A and 49B, and side plate portions 50A and 50B covering the side surfaces 22 to 24 excluding the side surface 25 provided with the female connector 34 among the four side surface portions 22 to 25 of the housing. 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 being set in the holder 47A of the standing shooting table 46A and the holder 47B of the lying shooting table 46B, the electronic cassette 10 is a subject H lying on the bed, or a subject that cannot move by itself, such as an elderly person or a suddenly ill person. It may be used alone for H. Further, when the housing 16 has substantially the same size as the film cassette, the IP cassette, and the CR cassette, the electronic cassette 10 can be attached to the existing imaging table for these cassettes.

In X-ray photography, scattered rays are generated when X-rays pass through the subject H. Therefore, when the electronic cassette 10 is used alone for the purpose of removing the scattered rays, the external grid 55 shown in FIG. 4 is used. May be used. The external grid 55 is detachably attached to the outside of the housing 16. The external grid 55 is composed of a rectangular grid body 56 and a holding frame 57 that holds the grid body 56. The grid main body 56 has a size slightly larger than that of the transparent plate 26 so as to cover the entire transparent plate 26 when the external grid 55 is attached to the housing 16. Further, the holding frame 57 is made of a conductive material having electromagnetic wave shielding properties such as aluminum and stainless steel, and has a size slightly larger than that of 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 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 well-known dropout prevention / release mechanism that fixes the external grid 55 to the housing 16 to prevent the external grid 55 from falling off and releases the external grid 55. Has been done.

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 along the line AA of FIG. 5, between the side surface 23 and the back surface 21, the side surface 23 and the back surface 21 On the other hand, an inclined surface 65 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 includes an antenna 75 and an oscillation circuit (not shown). The wireless communication unit 30 is attached in 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 is incident on 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 is arranged so that the installation surface 30A of the antenna 75 of the wireless communication unit 30 is substantially parallel to the inclined surface 65.

The cover 73 is made of a non-conductive material such as a resin having radio wave transmission. The cover 73 has the same shape and 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 to 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, for example, an adhesive. The antenna opening 66 is watertightly and airtightly closed by the cover 73.

In order to facilitate the positioning of the external grid 55 with respect to the housing 16, the side plate portion 59 of the external grid 55 is, for example, a boundary between the side surface 23 and the inclined surface 65 (the first) as shown by the alternate long and short dash line in FIG. It has a length of about 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 as in the inclined surface 65. The inclined surfaces 65 and 80 are formed of curved surfaces that are convex toward the outside of the housing 16. Although not shown, an inclined surface 65 is also formed between the side surfaces 22, 24, 25 and the back surface 21 other than the side surface 23, and the inclined surface 80 is also formed between the side surfaces 22, 24, 25 and the front surface 20. Is 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, which is the boundary between the side surface 23 and the inclined surface 65, and the second boundary 86, which is the boundary between the back surface 21 and the inclined surface 65. Further, 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, for the side surfaces 22, 24, 25, the width W1 of the inclined surface 65 is wider than the width of the side surfaces 22, 24, 25.

Next, the operation of the above configuration will be described. First, when performing X-ray imaging, as shown in FIG. 3, the electronic cassette 10 is held in the holder 47A or the recumbent position of the standing imaging table 46A so that the X-ray source 45 and the front surface 20 are held in a facing posture. It is set in the holder 47B of the shooting 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 plates 49A and 49B. When the antenna opening 66 is blocked by the back plates 49A and 49B, the emission of the radio wave EW from the antenna opening 66 or the incident of the radio wave EW into the antenna opening 66 is hindered, and stable wireless communication is performed. Can no longer be done.

However, in the present embodiment, the housing 16 is formed with an inclined surface 65 inclined with respect to the side surface 23 and the back surface 21, and the antenna opening 66 is formed on the inclined surface 65. The antenna opening 66 is not blocked by the 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 from the antenna opening 66 to the outside of the housing 16 and travels through the gap between the inclined surface 65 and the back plates 49A and 49B to the back plates 49A and 49B. To reach. The radio wave EW that has reached the back plate portions 49A and 49B is emitted to the outside of the holders 47A and 47B while being reflected several times by the back plate portions 49A and 49B and the housing 16. The radio wave EW from the control device follows a path opposite to that of 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 photographing table 46A or the holder 47B of the lying position photographing table 46B, stable wireless communication can be performed.

Further, even when an electronic cassette 10 is inserted between the subject H lying on the bed and the bed for X-ray photography, a sufficient gap is secured between the inclined surface 65 and the bed for the radio wave EW to be emitted or incident. Therefore, it has the same 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 electronic cassette 10 is transmitted through the subject H.

Here, consider a 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 the cover 91. Further, the antenna 75 is arranged at a position facing the antenna opening 90.

In this case, for example, when an external grid 55 having a side plate portion 59 having a length of about the first boundary 85 shown by the alternate long and short dash line in FIG. 6 is attached to the housing 16, the side plate portion 59 has an antenna opening 90. Is blocked. Therefore, as in the case where the antenna opening 66 is blocked by the back plate portions 49A and 49B, in this case as well, the side plate portion 59 hinders the emission and incident of the radio wave EW, so that stable wireless communication can be performed. become unable.

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

In this way, there is no need to cut out or make holes in the back plate portions 49A and 49B and the side plate portions 59 that close the antenna opening 66, and the holder 47A and the recumbent imaging table of the standing imaging table 46A are not required. Stable wireless communication can be performed regardless of the usage environment, such as setting the electronic cassette 10 in the holder 47B of the 46B or attaching the external grid 55 to the electronic cassette 10.

Therefore, even if the wireless communication of one wireless communication unit becomes unsuccessful, 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. 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 is weaker than that when the antenna opening 90 is not formed. When an electronic cassette 10 is inserted between the subject H lying on the bed and the bed to perform X-ray photography, the load of the subject H is concentrated on the side surface 23 parallel to the direction D, so that the strength of the side surface 23 is increased. I don't mind if I'm weak. On the other hand, if the strength of the side surface 23 is secured, even if the antenna opening 66 is formed on the inclined surface 65 and the intensity of the inclined surface 65 is weakened, 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 corner of the side surface 23 or the housing 16 and a force is applied to the side surface 23. Therefore, if the strength of the side surface 23 is secured, 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. It does not get in the way of 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, the antenna opening 66 is compared with the case where the antenna opening 90 is formed on the side surface 23 as in the comparative example of FIG. The opening area of the antenna can be widened, and the transmission / reception efficiency of the radio wave EW can be further improved.

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 having no corners. Therefore, the feeling of contact of the housing 16 with the subject H becomes soft. Further, when the electronic cassette 10 is placed on a flat surface, the electronic cassette 10 can be easily lifted by putting a finger 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 arranged 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. Further, the antenna 75 may have at least a function of wirelessly transmitting an X-ray image to the control device. Further, the wireless communication unit 30 is not limited to the one in which the antenna 75 and the oscillation circuit illustrated in the above embodiment are integrated, 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 at least the inclined surface 65 is provided between the side surface on which the wireless communication unit 30 is provided and the back surface 21. Just do it.

The side plate portion of the external grid does not have to be provided on all of the side surfaces 22 to 25. For example, an external grid in which the side plate portion is provided only on the portion facing the side surfaces 22 and 23 may be used. Further, the inclined surfaces 65 and 80 are not limited to a curved surface that is convex toward the outside of the housing 16 as in the above embodiment, and may be a flat surface or a shape that combines the curved surface and the flat surface.

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 can be applied not only to X-rays but also to electronic cassettes that image based on other radiation such as γ-rays.

10 Electronic cassette 15 Image detection unit 16 Housing 20 Front 21 Back 22 to 25 Side 30 Wireless communication unit 46A, 46B Standing position shooting table, lying position shooting table 47A, 47B Holder 48A, 48B Front plate part 49A, 49B Back plate part 55 External grid 58 Top plate 59 Side plate 65 Inclined surface 66, 90 Antenna opening 73, 91 Cover 75 Antenna 85, 86 1st boundary, 2nd boundary EW radio wave W1 Inclined surface width W2 Side width

Claims (12)

An image detection unit that detects a radiation image of the subject based on the radiation transmitted 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 surface and at least a part of the back surface. With 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 on the opposite side of the one end is in contact with the back surface.
An antenna arranged in the housing and at least for wirelessly transmitting the radiographic image by radio waves,
An antenna opening for transmitting radio waves, at least a part of which is formed in the inclined portion, and
A cover that closes the opening for the antenna is provided.
The cover and the housing are fixed to each other and
The housing is made of a conductive material
The cover is made of a non-conductive material having radio wave transmission.
An external grid that removes scattered rays generated when the radiation passes through the subject can be attached and detached.
The external grid has a top plate portion that covers the front surface, and a side plate portion that is provided at the edge of the top plate portion and extends from the front surface side to the back surface side and covers a part of the side surface. The side plate portion is an electronic cassette that does not block the opening for the antenna. 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 or 2, 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 the center of the opening for the antenna, and the installation surface is arranged so as to be parallel to the inclined portion. The electronic cassette according to claim 3 or 4, wherein the opening area of the antenna opening is larger than the area of the surface of the antenna facing the antenna opening. The electronic cassette according to claim 1 or 2, wherein the antenna is arranged at a position deviating from a position facing the antenna opening. The electronic cassette according to any one of claims 1 to 6, wherein the antenna is arranged with a gap between the antenna and the opening for the antenna. The electronic cassette according to any one of claims 1 to 7, wherein the antenna opening is any one of a rectangular shape, a circular shape, and an elliptical shape. The electronic cassette according to any one of claims 1 to 8, wherein the opening area of the antenna opening is smaller than the area of the inclined portion. The width of the inclined portion, which is the distance between the first boundary which is the boundary between the side surface and the inclined portion and the second boundary which is the boundary between the back surface and the inclined portion, is orthogonal to the front surface and the back surface. The electronic cassette according to any one of claims 1 to 9 , which 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 10 , which can be detachably set on a holder of a photographing table. The holder includes a front plate portion that covers the front surface and the holder.
The electronic cassette according to claim 11, further comprising a back plate portion that faces the front plate portion and covers the back surface portion.

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