JP7393583B2 - Radiography equipment and radiography system - Google Patents

Description

The present invention relates to a radiographic apparatus and a radiographic system.

Radiography equipment that irradiates an object with radiation and detects the intensity distribution of the radiation that has passed through the object to obtain a radiation image of the object is widely used in industrial non-destructive testing and medical diagnosis. . In recent years, imaging devices having a radiation detection panel that captures digital radiation images have been developed, and it has become possible to immediately obtain output images.

In order to enable rapid imaging of a wide range of parts using such an imaging device, a thin, lightweight and portable imaging device, a so-called electronic cassette, has been developed. Particularly in recent years, wireless type imaging devices that do not require cable connection have been developed to increase portability.

Patent Document 1 describes an imaging device in which a grip portion with an opening is disposed outside the imaging region when viewed from the radiation incident direction in order to improve the portability of the imaging device. Further, Patent Document 2 describes a photographing device in which a recessed portion is provided on the back surface of the device, which functions as a non-slip portion for a hand placed on the back surface.

Patent No. 3577003 Japanese Patent Application Publication No. 2015-51206

When a gripping portion having an opening is disposed outside the imaging area as in Patent Document 1, gripability is sufficient and portability is improved, but the imaging device cannot be sufficiently miniaturized. On the other hand, if a non-slip portion consisting of a recess is formed on the back surface of the photographing device as in Patent Document 2, the gap between the photographing area and the external shape of the photographing device can be reduced, making it easier to downsize, but the grip of the photographing device is not sufficient. Sometimes. As a result, it is conceivable that the camera may be dropped by mistake or that rapid photographing may be hindered.

An object of the present invention is to provide a radiographic apparatus that is small and has good gripability.

One aspect of the present invention is a radiographic apparatus that includes a radiation detection panel that detects radiation and a housing that houses the radiation detection panel, the housing that allows the radiation to be detected by the radiation detection panel. It has a front part for making the light incident, and a back part located on the opposite side to the front part, and the back part has a gripping area recessed toward the front part, and the gripping area is a first region having a longitudinal length in a direction along the first side of the four sides, and the first side of the four sides, when the outer periphery of the back surface part is viewed as a quadrilateral shape. a second region having a longitudinal length in the direction along the second side adjacent to the first region, and the first region has a second region having a longitudinal length in the direction along the second side adjacent to the first region. 1 end and a second end located closer to the first side than the first end, and the second region has an end in the transverse direction perpendicular to the longitudinal direction. a third end and a fourth end located closer to the second side than the third end; It is characterized in that it extends along the first side to a position where it intersects a first virtual axis that is a virtual axis extending along the second side between the fourth end and the fourth end.

According to the present invention, it is possible to provide a radiographic apparatus that is small and has good gripability.

FIG. 1 is a diagram showing the appearance of an imaging device according to a first embodiment. FIG. 1 is an internal sectional view of the imaging device according to the first embodiment. FIG. 2 is a cross-sectional view of the housing of the imaging device according to the first embodiment. FIG. 3 is a diagram for explaining a state in which the imaging device of the first embodiment is held. FIG. 3 is a cross-sectional view of the grip portion of the imaging device according to the first embodiment. FIG. 3 is a diagram illustrating a state when the photographing device of the first embodiment is taken out from the cradle. FIG. 3 is a cross-sectional view of the grip portion of the imaging device according to the first embodiment. FIG. 7 is an external view of the photographing device according to the second embodiment as seen from the back. FIG. 3 is an internal sectional view of an imaging device according to a second embodiment. FIG. 7 is a diagram showing the appearance of a photographing device according to a second embodiment. 1 is a diagram showing a radiation imaging system according to an embodiment of the present invention.

[First embodiment]
FIG. 1(a) shows an external view of a part of the front surface 7a and side surface 7c of a rectangular parallelepiped-shaped housing 7 into which radiation enters, of a radiation imaging apparatus (imaging apparatus) 100 incorporating a radiation detection panel 1. . FIG. 1(b) is a perspective view of a portion of the back surface 7b and side surface 7c of the imaging device 100 on the opposite side of FIG. 1(a). As shown in FIG. 1(b), a recessed grip portion 10 is formed on the back surface 7b of the housing 7 of the imaging device 100 of the first embodiment. FIG. 2(a) shows an internal cross-sectional view of the imaging device 100 in the direction AA in FIG. 1(b). FIG. 2(b) shows an internal sectional view of the photographing device 100 in the direction BB in FIG. 1(b). Generally, in the imaging apparatus 100, the radiation detection panel 1 detects radiation emitted by a radiation source 210 shown in FIG. 11 and transmitted through a subject. Images acquired by this photographing device 100 are transferred to an external device, displayed on a monitor, etc., and used for diagnosis and the like. In FIG. 1(b), four gripping parts 10 are shown arranged in the peripheral area of the back surface 7b. Each grip portion 10 extends in a first direction perpendicular to one mutually parallel side that defines the outer shape of the back surface 7b. Each grip portion 10 extends to include a center position between the pair of sides.

The radiation detection panel 1 includes a sensor substrate 1c on which a large number of photoelectric conversion elements (sensors) are arranged, a phosphor layer (scintillator layer) 1a arranged on the sensor substrate 1c, a phosphor protective film 1b, etc. This is the so-called indirect conversion method. The phosphor protective film 1b is made of a material with low moisture permeability and protects the phosphor layer 1a. The radiation detection panel 1 is connected to a flexible circuit board 4. Furthermore, a control board 5 that reads detection signals from the radiation detection panel 1 and processes the read detection signals is connected to the flexible circuit board 4. As shown in FIG. 2(a), the photographing device 100 of the first embodiment includes a rechargeable battery 2 for supplying necessary power. The imaging device 100 of the first embodiment also includes a connector 8 for supplying power from the outside via a wired connection and for communicating with the outside. The control board 5 and the rechargeable battery 2 are collectively referred to as electrical components. In the first embodiment, the rechargeable battery 2 is arranged between the back surface 7b and the radiation detection panel 1 in a central region surrounded by the peripheral region of the back surface 7b where the grip portion 10 is formed. The radiation detection panel 1 may be of a so-called direct conversion type, consisting of a conversion element made of a-Se or the like and a conversion element portion in which electric elements such as TFTs are arranged two-dimensionally, but is not limited thereto.

The radiation detection panel 1 is supported by a support base 6 and enclosed in a housing 7. The housing 7 has a rectangular front surface 7a through which radiation enters, a rectangular rear surface 7b on the opposite side of the front surface 7a with the radiation detection panel 1 in between, and four side surfaces 7c connecting the front surface 7a and the rear surface 7b. ing. Further, a cushioning material 3 is arranged between the front surface 7a and the radiation detection panel 1 to protect the radiation detection panel 1.

The imaging device 100 of the first embodiment has the following configuration in order to improve gripability and portability. As shown in FIG. 1(b), the housing 7 has a gripping recess (gripping portion) 10 recessed toward the radiation detection panel 1 in a peripheral area along each side of a rectangular back surface 7b. There is. By having the grip portions 10 along each side of the back surface 7b, it is possible to hold the photographing device 100 in various directions, making it easy to handle the photographing device 100, and facilitating quick photographing.

When these gripping parts 10 are viewed from the direction opposite to the direction of radiation incidence, a part of the gripping parts 10 or the maximum depth region (bottom surface) D is within 60 mm from the side surface 7c of the housing 7. FIG. 3 shows a cross-sectional view of the housing 7 of the imaging device 100 in the CC direction in FIG. 1(b). FIG. 3 shows an example of the position and shape of the grip part 10. In the example of FIG. 3, the length of the area (A area) from the side surface 7c of the housing 7 to the starting end of the gripping part 10 is 25 to 40 mm, and the length of the area (B area) between the starting end and the terminal end of the gripping part 10 is 25 to 40 mm. The length is 15 to 30 mm. The reason why the dimension of the A region is set to 25 to 40 mm is that the gripping forces α and β when holding the panel-shaped photographing device 100 substantially perpendicular to the ground as shown in FIG. 4(a) are sufficient for the photographing device 100. This is so that they can participate. If the dimension of area A is too large or too small from 25 to 40 mm, it becomes difficult to grip the photographing device 100. If the B area is too small, a problem arises in that it is difficult to insert a finger, and conversely, if the B area is too large, a problem occurs in that the internal volume of the photographing device 100 is reduced. In other words, by having the A area and the B area have the above-mentioned dimensions, it is possible to secure the volume that accommodates each component of the imaging device 100 while ensuring portability. Specifically, when area B becomes larger toward the inside of the photographing device 100, the space in which the rechargeable battery 2 and the control board 5 shown in FIG. 2(a) are housed may be limited. Alternatively, the space for arranging the support base 6 shown in FIG. 2(b) may be limited.

When holding the imaging device 100 approximately parallel to the ground, such as when inserting the imaging device 100 into the back of a subject, it is also conceivable to hold the imaging device 100 with the fingers extended, as shown in FIG. 4(b). . In this case, if the total size of area A and area B is too large, it will be difficult to stably support the imaging device 100, resulting in poor operability. Therefore, the total dimension of area A and area B should be within 60 mm. This allows the imaging device 100 to quickly respond to various types of imaging.

The depth C of the gripping portion 10 is determined by the depth C of the housing 7 so that the photographing device 100 can easily rotate in the direction of the palm when the photographing device 100 is held substantially perpendicular to the ground as shown in FIG. 4(a). The distance should be at least 1/2 of the distance between the front surface 7a and the rear surface 7b. Alternatively, the depth C of the grip portion 10 is greater than or equal to the distance between the back surface 7b of the housing 7 and the center of gravity of the imaging device 100. By setting the depth C of the grip portion 10 in this manner, it is easy to generate a moment for rotation of the photographing device 100 in the direction of the palm, and the rotation moment in the direction away from the palm is minimized. As a result, the photographing device 100 is easily stabilized when held, and the burden on the user can be reduced. Even if the depth C of the gripping portion 10 cannot be deeper than the center of gravity of the imaging device 100, the depth C of the gripping portion 10 may be approximately 5 mm or more in order to sufficiently increase the holding force β of the imaging device 100. can.

In the first embodiment, the thickness of the photographing device 100 is set to 13 to 16 mm in accordance with the standard dimensions of general photographing cassettes of JIS Z4905 (Photography - Medical photographing cassettes, intensifying screens and films - dimensions and specifications). Therefore, it is preferable that the depth C of the gripping portion 10 is greater than 6.5 to 8.0 mm. Furthermore, the bottom surface (area D) of the gripping section 10 overlaps with the imaging area where imaging is performed when viewed from the radiation incident direction. Therefore, in order to prevent the gripping part 10 from penetrating the radiation detection panel 1, the upper limit of the depth C of the gripping part 10 is set to about 10 to 14 mm. Further, in order to make the grip part 10 easier to grasp, the shape of the end of the photographing device 100 where the side surface 7c of the housing 7 intersects with the front surface 7a and the rear surface 7b is rounded or sloped as shown in FIG. It can be a shape. Furthermore, as shown in FIG. 3, the grip part 10 connects the two side walls with a first side wall and a second side wall each extending in a first direction perpendicular to one mutually parallel side defining the outer shape of the back surface 7b. It includes the bottom surface. The first direction is the longitudinal direction of the grip portion 10 shown in FIG. 1(b), and is a direction perpendicular to the paper surface of FIG. The angle (first angle) E formed by the side wall farther from the center of gravity of the photographing device 100 and the back surface 7b depends on the frictional force, but is in order to suppress the decrease in internal space as much as possible and maintain sufficient gripping force. The angle shall be 120° or less and 90° or more. Further, the angle (second angle) F between the side wall opposite to the side wall forming the angle E and the rear surface 7b is larger than the angle E. Here, it is preferable that the angle F is at least larger than 90°. Since the angle of inclination inside the grip part 10 is gentle, it is possible to easily insert a hand into the grip part 10. Thereby, when gripping as shown in FIG. 4(a), it is possible to obtain the effect of making it easier to insert a hand into the gripping part 10 while suppressing a decrease in the internal space of the photographing apparatus 100 as much as possible.

The coefficient of surface friction inside the recess of the gripping part 10 is made higher than the coefficient of surface friction of the outer surface of the casing 7 excluding the gripping part 10 in order to prevent the imaging device 100 from slipping from the hand holding the gripping part 10. be able to. This can be achieved by changing the surface finish of the casing 7 or by attaching a frictional sheet material or the like to the grip portion 10. The sheet material is made of, for example, a material such as rubber or foamed resin. In order to improve the surface friction coefficient of the gripping part 10, the surface of the gripping part 10 may be provided with irregularities. By increasing the friction coefficient of the gripping part 10 compared to the back surface 7b of the housing 7, when inserting the imaging device 100 into the back of a patient, the insertion is smooth and easy. The device 100 can be held stably. As a result, the handling of the photographing device 100 is improved.

The grip portion 10 can take various shapes other than the shape shown in FIG. 3, as shown in FIGS. 5(a) to 5(c). In FIG. 5A, in order to increase the internal volume of the housing 7 of the imaging device 100 as much as possible, the grip portion 10 has a semicircular cross-sectional shape. In FIG. 5(b), the cross-sectional shape of the gripping part 10 is a parallelogram, and in FIG. 5(c), the cross-sectional shape of the gripping part 10 is a polygon. When the cross-sectional shape of the gripping portion 10 is as shown in FIG. 5(b) or FIG. 5(c), the holding force is increased when holding the imaging device 100 substantially perpendicular to the ground as shown in FIG. 4(a). The direction of β changes, making it easier to hold the photographing device 100 in the direction of rotation in the palm of the hand, and enabling stable grip. In the first embodiment, no electrical components such as the rechargeable battery 2 or the control board 5 are disposed between the grip portion 10 and the radiation detection panel 1.

In the grip part 10, the housing 7 and the support base 6 are connected by bonding the back member having the rear surface 7b of the housing 7 and the support base 6 that supports the radiation detection panel 1 with adhesive or screws. The rigidity of the photographing device 100 can be improved by integrating the two. When placing an electrical component or the like between the gripping section 10 and the radiation detection panel 1, in order to avoid damage to the electrical component even if a large load is applied, a A spacer, a foam material that serves as a cushioning material, etc. can be placed. Further, a configuration may also be adopted in which a heat dissipating material is disposed between the electrical component and the grip portion 10 to efficiently dissipate heat to the outside.

When the imaging apparatus 100 is viewed from the direction opposite to the direction of radiation incidence, as shown in FIG. 6, a connector 8 for external communication can be disposed on the side surface 7c. In this case, the peripheral area where the four gripping parts 10 are arranged is a first peripheral area that includes the side surface 7c where the connector 8 is placed as a boundary line, and a first peripheral area that does not include the side surface 7c where the connector 8 is placed as a boundary line. It is divided into two peripheral areas. As shown in FIG. 6, the gripping portions 10 formed in the first peripheral area including the side surface 7c where the connector 8 is disposed as a boundary line are longer than the gripping parts 10 formed in the second peripheral area, and are mutually connected to each other. have different shapes. That is, the grip portion 10 formed in the first peripheral region including the side surface 7c on which the connector 8 is disposed as a boundary line may extend to the vicinity of the corner of the back surface 7b. In order to charge the photographing device 100, it is conceivable to use a charging cradle 200 or the like external to the photographing device 100, and this is because handling at that time can be made easier. The connector 8 can be given a holding force by using a magnet or the like, but as shown in FIG. It can be easily removed. Furthermore, if the gripping section 10 is made longer, the area that can be gripped increases and the photographing device 100 can be easily handled, so that there is an advantage that rapid photographing becomes easier.

In FIG. 6, the connector 8 for external communication is provided on the side surface 7c of the housing 7. However, as shown in FIG. 7, the connector 8 for external communication may be provided inside the grip portion 10. As a result, the connector 8 is placed in a position where external force is difficult to be applied directly, and the connector 8 is easily protected. 7 is a cross-sectional view taken along the line CC in FIG. 1(b), similar to FIG. 3. As shown in the figure, it is preferable to arrange the connector 8 on a side wall opposite to the side wall of the grip portion 10 that is touched when gripping the photographing device 100.

When gripping the imaging device 100 using the gripping portion 10, as shown in FIG. It is assumed that it will be covered. Therefore, the switch 11 and the like are not provided in the area of the photographing device 100 that is covered by the hand holding the photographing device 100. This is because if the switch 11 or the like is placed in an area covered by the hand holding the photographing device 100, it is assumed that an incorrect operation will occur. In the first embodiment as well, as shown in FIG. 6, the switch 11 does not have the grip part 10 in its vicinity and is installed in an area that is not covered by the hand holding it.

If the LED or speaker that indicates the status is covered by your hand, it may become difficult to determine the status. If the antenna is covered with hands, the radiation performance of the antenna will be affected, so it is preferable to place the antenna at least half a wavelength away from the area covered with hands. The hand holding the speaker also affects the sound diffusion. If the connector 8 for wired connection is placed in a position that is covered by the user's hand, it will be difficult to grasp the imaging device 100 when the connector 8 and the cable are connected. Therefore, similarly to the switch 11, the LED and speaker for status display, the antenna for infrared communication and wireless communication, and the connector 8 for wired connection are arranged in an area that is not covered by the hand holding the photographing device 100.

The photographing device 100 of the first embodiment having the above configuration achieves both improved gripability and miniaturization by providing the grip portion 10 within the photographing region.

[Second embodiment]
In the first embodiment, one embodiment of the imaging device that is small and has good gripability has been described. In the second embodiment, in order to improve the portability of the imaging device, in addition to making it easier to hold, it is also made lighter. FIG. 8 is a diagram of the imaging apparatus 100 in the second embodiment viewed from the side opposite to the radiation incident direction. At least a portion of the grip part 10 of the second embodiment has the same shape, etc. as the grip part 10 of the first embodiment. If the user inserts his or her fingers into the center of the gap between the pair of sides of the back surface 7b that sandwich the grip portion 10 and grips the photographing device 100, the photographing device 100 can be stably gripped because no moment is generated. In the second embodiment, even when the imaging device 100 is hidden behind the subject and the grip part 10 cannot be seen visually, the center of the grip part 10 is provided so as to be tactilely detectable. In the second embodiment, a portion 10a1 indicating the center is formed in some of the gripping portions 10a. The region 10a1 indicating the center is, for example, a protrusion or a depression, as shown in FIG. The portion 10a1 indicating the center may have smoothness different from other portions of the grip portion 10a. Furthermore, the portion 10a1 indicating the center may be formed by changing the shape or depth of a part of the cross-sectional shape of the grip portion 10a.

In FIG. 8, the longitudinal direction of four of the five gripping parts 10 is parallel to the side defining the outer shape of the back surface 7b, similarly to the gripping part 10 of the first embodiment. Two of them are gripping parts 10b that do not have a region 10a1 that indicates the center like the gripping section 10 of the first embodiment, and the remaining two are gripping parts 10a that have a region 10a1 that shows the center. The remaining one grip part 10c has the same structure and shape as the grip part 10 of the first embodiment, but is arranged at a corner of the back surface 7b, and its longitudinal direction intersects each of the sides defining the outer shape of the back surface 7b. It is formed like this. This one gripping part 10c is formed so that the direction (short side direction) perpendicular to the longitudinal direction of the recess faces the center of gravity or the center of the photographing device 100.

FIG. 9 shows a cross-sectional view of the imaging device 100 shown in FIG. 8 in the CC direction. As in the first embodiment, a control board 5 for controlling readout of the radiation detection panel 1 and processing electrical output is connected to the radiation detection panel 1 via a flexible circuit board 4, and a housing 7 houses them. have. A rechargeable battery 2 for supplying power is also provided in the same manner.

The inner surface of the back surface member on the radiation detection panel 1 side including the back surface 7b of the casing 7 of the second embodiment includes a support surface that supports the radiation detection panel 1, and the side of the back surface member opposite to the radiation detection panel 1 A recess 12 is formed on the outer surface of the recess 12 for arranging an electrical component. Thereby, it is possible to integrate the support base 6 in the first embodiment and a part of the back member, making it easy to reduce the weight. Furthermore, since the housing 7 is formed with a large number of recesses, including the recesses that serve as the grip portions 10 and the recesses 12 for arranging electrical components, the bending rigidity of the housing 7 can be increased. Moreover, as shown in FIG. 9, the back member can be configured to have a multilayer structure including a core layer 7b2 and a skin layer 7b1 sandwiching the core layer, thereby making it easier to reduce the weight. The skin layer 7b1 may be formed of fiber-reinforced resin such as CFRP, fiber-reinforced metal, or metal alloy such as aluminum alloy or magnesium alloy. The core layer 7b2 may be formed of foamed resin or a structure having a honeycomb structure or a lattice structure. Furthermore, in the present embodiment, a removable access cover (cover member) 9 is provided in the recess 12 for arranging electrical components and the like so that the electrical components are not exposed to the outside.

The photographing device 100 of the second embodiment having the above configuration achieves both improved gripability and miniaturization as in the first embodiment, and is also more lightweight than the first embodiment. In both the first embodiment and the second embodiment, the photographing device 100 having a plurality of gripping portions 10 has been described, but the number of gripping portions 10 configured in the photographing device 100 is not limited to this, as shown in FIG. 10. may be one.

[Radiography system]
FIG. 11 relates to a radiographic system including the radiographic apparatus 100 described above. As shown in FIG. 11, X-rays (radiation) 211 generated in an X-ray tube (radiation source) 210 pass through a chest 221 of a patient or subject 220 and enter the radiographic apparatus 100. The incident X-rays contain information about the inside of the patient's 220 body. The scintillator (phosphor) emits light in response to the incidence of X-rays, and the sensor (photoelectric conversion element) 111 of the sensor panel 110 photoelectrically converts this light emission to obtain electrical information. This electrical information is converted into digital data, subjected to image processing by a signal processing unit (image processor) 230, and can be observed by a display unit (display) 240.

Further, the information subjected to image processing by the image processor 230 can be transferred to a remote location by a transmission processing unit 250 such as a network such as a telephone, LAN, or the Internet. Therefore, the information image-processed by the image processor 230 can be displayed on a display 241 in a doctor's room or the like in another location, or can be saved in a recording unit such as an optical disk. Diagnosis is possible by Further, the information processed by the image processor 230 can also be recorded on the film 261 by the film processor 260.

The radiation detection device of the present invention can be applied to medical radiation detection devices and devices for non-medical analysis and inspection using radiation, such as non-destructive testing devices.

100: Radiation imaging device (imaging device). 1: Radiation detection panel. 2: Rechargeable battery (electrical parts). 3: Cushioning material. 4: Flexible circuit board. 5: Control board (electrical parts). 6: Support base. 7: Housing. 7a: Front. 7b: Back. 7b1: Skin material. 7b2: Core material. 7c: Side. 8: Connector. 9: Access cover. 10: Gripping part.

Claims (29)

A radiation imaging apparatus comprising a radiation detection panel that detects radiation and a housing that houses the radiation detection panel,
The casing has a front part for allowing the radiation to enter the radiation detection panel, and a back part located on the opposite side of the front part,
The back part has a gripping area recessed toward the front part,
When the outer periphery of the back surface part is viewed as a quadrilateral shape, the gripping area includes a first area having a longitudinal length along a first side of the four sides, and a first area having a longitudinal length along a first side of the four sides. a second region having a longitudinal length in a direction along a second side adjacent to the first side;
The first region has a first end and a second end located closer to the first side than the first end, as ends in the transverse direction orthogonal to the longitudinal direction. has
The second region has a third end and a fourth end located closer to the second side than the third end, as an end in the transverse direction perpendicular to the longitudinal direction. has
The first region extends to a position where the first region intersects a first virtual axis that is a virtual axis extending between the third end and the fourth end along the second side. A radiation imaging device characterized by extending along a side. 2. The first region extends along the first side from a position corresponding to the center of the first side to a position intersecting the first virtual axis. radiographic equipment. The gripping region further includes a third region having a longitudinal length in a direction along a third side adjacent to the first side among the four sides,
The third region has a fifth end and a sixth end located closer to the third side than the fifth end, as ends in the transverse direction orthogonal to the longitudinal direction. has
The first region extends between the fifth end and the sixth end to a position where it intersects a second virtual axis, which is a virtual axis extending along the third side. The radiographic apparatus according to claim 1 or 2, wherein the radiation imaging apparatus extends along a side. 4. The first region extends along the first side from a position corresponding to the center of the first side to a position intersecting the second virtual axis. radiographic equipment. 5. The radiographic apparatus according to claim 1, wherein the center of gravity of the radiographic apparatus is located in a direction perpendicular to the longitudinal direction of the first region. The radiographic apparatus according to any one of claims 1 to 5, wherein the first region has a depth of 5 mm or more. The radiographic apparatus according to claim 6, wherein the first region has a depth of 6.5 to 8.0 mm. Claim characterized in that the length from the first end to the second end and the length from the third end to the fourth end are 15 to 30 mm. 8. The radiographic apparatus according to any one of 1 to 7. Claims 1 to 4, wherein the length from the first side to the second end and the length from the second side to the fourth end are 25 to 40 mm. 8. The radiographic apparatus according to any one of 8. The radiographic apparatus according to any one of claims 1 to 9, wherein the thickness of the radiographic apparatus is 13 to 16 mm. 11. Any one of claims 1 to 10, wherein an angle formed by the second end and the fourth end with respect to a main surface of the back surface is 120 degrees or less and 90 degrees or more. The radiographic apparatus described in Section 1. The radiographic apparatus according to any one of claims 1 to 11, wherein a frictional sheet material is attached to the grip area. The radiographic apparatus according to any one of claims 1 to 12, wherein the gripping area and the area of the back surface excluding the gripping area have different surface properties. 14. The radiographic apparatus according to claim 1, wherein the back surface has an attachment area for attaching a rechargeable battery in an area closer to the center than the first area. A radiation imaging apparatus comprising a radiation detection panel that detects radiation and a housing that houses the radiation detection panel,
The casing has a front part for allowing the radiation to enter the radiation detection panel, and a back part located on the opposite side of the front part,
The back part has a gripping area recessed toward the front part,
When the outer periphery of the back surface part is viewed as a quadrilateral shape, the gripping area includes a first area having a longitudinal length along a first side of the four sides, and a first area having a longitudinal length along a first side of the four sides. a second region having a longitudinal length in a direction along a second side adjacent to the first side;
The first region has a first end and a second end located closer to the first side than the first end, as ends in the transverse direction orthogonal to the longitudinal direction. has
The second region has a third end and a fourth end located closer to the second side than the third end, as an end in the transverse direction perpendicular to the longitudinal direction. has
The radiographic apparatus is characterized in that the first region extends along the first side to a position where it intersects a first virtual extension line that is a virtual extension line of the third end. 16. The first region extends along the first side from a position corresponding to the center of the first side to a position intersecting the first imaginary extension line. The radiographic apparatus described. The gripping region further includes a third region having a longitudinal length in a direction along a third side adjacent to the first side among the four sides,
The third region has a fifth end and a sixth end located closer to the third side than the fifth end, as ends in the transverse direction orthogonal to the longitudinal direction. has
16. The first region extends along the first side to a position where it intersects a second imaginary extension line that is an imaginary extension line of the fifth end. The radiographic apparatus described in . 18. The first region extends along the first side from a position corresponding to the center of the first side to a position intersecting the second virtual extension line. The radiographic apparatus described. The radiographic apparatus according to any one of claims 15 to 18, wherein the center of gravity of the radiographic apparatus is located in a direction perpendicular to the longitudinal direction of the first region. The radiographic apparatus according to any one of claims 15 to 19, wherein the first region has a depth of 5 mm or more. The radiographic apparatus according to claim 20, wherein the first region has a depth of 6.5 to 8.0 mm. Claim characterized in that the length from the first end to the second end and the length from the third end to the fourth end are 15 to 30 mm. 22. The radiographic apparatus according to any one of 15 to 21. Claims 15 to 15, characterized in that the length from the first side to the second end and the length from the second side to the fourth end are 25 to 40 mm. 20. The radiographic apparatus according to any one of 19. The radiographic apparatus according to any one of claims 15 to 23, wherein the thickness of the radiographic apparatus is 13 to 16 mm. 25. Any one of claims 15 to 24, wherein an angle formed by the second end and the fourth end with respect to the main surface of the back surface is 120 degrees or less and 90 degrees or more. The radiographic apparatus described in Section 1. The radiographic apparatus according to any one of claims 15 to 25, wherein a frictional sheet material is attached to the grip area. The radiographic apparatus according to any one of claims 15 to 26, wherein the gripping area and the area of the back surface excluding the gripping area have different surface properties. 28. The radiographic apparatus according to claim 15, wherein the back surface has an attachment area for attaching a rechargeable battery in an area closer to the center than the first area. The radiographic apparatus according to any one of claims 1 to 28,
a radiation source for generating the radiation;
A radiation imaging system comprising:

Images