| CPC A61B 6/4405 (2013.01) [A61B 6/4266 (2013.01); A61B 6/461 (2013.01); A61B 6/54 (2013.01); G01T 1/20182 (2020.05)] | 28 Claims |

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1. A radiation imaging apparatus comprising:
a radiation detector configured to detect radiation;
a mobile radiography unit configured to house the radiation detector and including a radiation generator; and
a setting unit configured to set at least one of a reference orientation of the radiation detector for calculating an orientation of the radiation detector and a reference orientation of the radiation generator for calculating an orientation of the radiation generator,
wherein the radiation imaging apparatus is configured to perform radiation imaging to generate an image based on the radiation, and
wherein the setting unit performs the setting in response to determining that the mobile radiography unit stands still, with the radiation detector housed in the mobile radiography unit.
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