| 摘要 |
The present invention provides a radiographic apparatus that can limit unnecessary exposure of the subject to radiation. That is, the configuration of the invention is provided with an X-ray tube (3), a collimator (3a) and a visible light source (9). If the collimator (3a) is opened too far, the spread of the visible light rays and the spread of the radiation passing through the collimator (3a) sometimes do not match. Such a situation occurs when an X-ray tube (3) that generates radiation of a narrow spread is loaded in the apparatus. In order to avoid such a situation, the present invention is provided with maximum degree of opening, which is the upper limit of the degree of collimator (3a) opening. The configuration of the invention provides a radiographic apparatus with which there is no need for re-doing imaging and unnecessary exposure of the subject (M) to radiation is limited. |
