Radiation imaging apparatus and radiation imaging system

1. A radiation imaging apparatus comprising:

a radiation detection panel configured to detect radiation; and

a housing of a cuboid shape configured to accommodate the radiation detection panel, the housing having a front surface that the radiation enters, a rectangular back surface arranged on a side opposite to a side of the front surface with the radiation detection panel being sandwiched between the front surface and the back surface, and four side surfaces configured to connect the front surface and the back surface, the housing further providing a grip portion which is concave toward the radiation detection panel, formed in a peripheral region on the back surface, wherein

the grip portion has at least one of a depth not less than one-half a distance between the front surface and the back surface, and a depth not less than a distance between the back surface and a center of gravity of the radiation imaging apparatus.

2. The apparatus according to claim 1 , further comprising an electric component arranged between the back surface and the radiation detection panel in a center region surrounded by the peripheral region.

3. The apparatus according to claim 1 , further comprising a connector arranged on at least one of the side surfaces and configured to perform one of power feeding from outside and external communication,

wherein the peripheral region includes a first peripheral region with the at least one side surface as a boundary line and a second peripheral region without the at least one side surface as the boundary line, and

the grip portion includes a first grip portion arranged in the first peripheral region and a second grip portion arranged in the second peripheral region, the first grip portion and the second grip portion having different shapes.

4. The apparatus according to claim 1 , wherein the grip portion includes a first side wall and a second side wall each extending in a first direction perpendicular to a pair of sides which define an outer shape of the back surface and are parallel to each other and a bottom surface which connects the first side wall and the second side wall, and extends including a center position between the pair of sides.

5. The apparatus according to claim 4 , wherein a first angle formed by the back surface and the side wall, out of the first side wall and the second side wall, farther from the center of gravity of the radiation imaging apparatus is not more than 120°.

6. The apparatus according to claim 5 , wherein a second angle formed by the back surface and the side wall, out of the first side wall and the second side wall, closer to the center of gravity of the radiation imaging apparatus is larger than the first angle.

7. The apparatus according to claim 4 , wherein a part indicating the center position between the pair of sides is formed on at least one of the first side wall, the second side wall, and the bottom surface.

8. The apparatus according to claim 7 , wherein the part is one of a projection and a dent.

9. The apparatus according to claim 7 , wherein the part has smoothness different from that of a remaining part of the grip portion.

10. The apparatus according to claim 1 , wherein the grip portion is arranged at a corner of the back surface, and includes a first side wall and a second side wall each extending in a direction crossing each of four sides which define an outer surface of the back surface, and a bottom surface which connects the first side wall and the second side wall.

11. The apparatus according to claim 10 , wherein a first angle formed by the back surface and the side wall, out of the first side wall and the second side wall, farther from the center of gravity of the radiation imaging apparatus is not more than 120°.

12. The apparatus according to claim 11 , wherein a second angle formed by the back surface and the side wall, out of the first side wall and the second side wall, closer to the center of gravity of the radiation imaging apparatus is larger than the first angle.

13. The apparatus according to claim 1 , further comprising a connector arranged inside the grip portion and configured to perform one of power feeding from outside and external communication.

14. The apparatus according to claim 1 , further comprising a support base configured to support the radiation detection panel,

wherein in the grip portion, the support base is coupled to a back-surface member having the back surface in the housing.

15. The apparatus according to claim 1 , further comprising a support base configured to support the radiation detection panel; and

an electric component arranged between the support base and the grip portion, wherein

at least one of a buffer material, a spacer, and a heat radiating material is arranged between the grip portion and the electric component.

16. The apparatus according to claim 1 , wherein in a center region surrounded by the peripheral region on the back surface, a concave portion concave toward the radiation detection panel is formed, and an electric component is arranged in the concave portion.

17. The apparatus according to claim 16 , further comprising a cover member configured to cover the concave portion.

18. The apparatus according to claim 1 , wherein a back-surface member having the back surface in the housing has a multi-layered structure of a core layer and skin layers sandwiching the core layer.

19. A radiation imaging system, comprising:

a radiation imaging apparatus;

a signal processing unit configured to process a signal from the radiation imaging apparatus;

a display unit configured to display the signal from the signal processing unit; and

a radiation source configured to generate radiation, wherein

the radiation imaging apparatus comprises a radiation detection panel configured to detect radiation and a housing of a cuboid shape configured to accommodate the radiation detection panel,

the housing having a front surface that the radiation enters, a rectangular back surface arranged on a side opposite to a side of the front surface with the radiation detection panel being sandwiched between the front surface and the back surface, and four side surfaces configured to connect the front surface and the back surface, the housing further providing a grip portion which is concave toward the radiation detection panel, formed in a peripheral region on the back surface,

the grip portion having at least one of a depth not less than one-half a distance between the front surface and the back surface, and a depth not less than a distance between the back surface and a center of gravity of the radiation imaging apparatus.

20. A radiation imaging apparatus comprising:

a radiation detection panel configured to detect radiation;

a housing of a cuboid shape configured to accommodate the radiation detection panel, the housing having a front surface that the radiation enters, a rectangular back surface arranged on a side opposite to a side of the front surface with the radiation detection panel being sandwiched between the front surface and the back surface, and four side surfaces configured to connect the front surface and the back surface;

an electric component arranged between the back surface and the radiation detection panel; and

a grip portion which is concave toward the radiation detection panel, formed in a peripheral region on the back surface, wherein

the grip portion has at least one of a depth not less than one-half a distance between the front surface and the back surface, and a depth not less than a distance between the back surface and a center of gravity of the radiation imaging apparatus, and

none of the electric component is arranged between the grip portion and the radiation detection panel.